<div dir="ltr"><div class="markdown-here-wrapper" style=""><p style="margin:0px 0px 1.2em!important">I received some feedback on this proposal from Ankit Aggarwal, which centered on how developers would edit and update their baseline metrics. Here’s what I’m envisioning specifically:</p>
<h1 id="two-new-command-line-options-for-swift-test-" style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)">Two new command-line options for <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test</code></h1>
<ol style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test --performance-metrics &lt;path&gt;</code>. This is a path to a directory where JSON files containing the baseline metrics for the tests will be stored. By default, this path will be <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">MyPackage/Tests/PerformanceMetrics</code>. In my previous email, I suggested the default <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">--performance-metrics</code> path could be set to the same path as the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test --build-path</code> directory, but I have reconsidered. This is because I think developers would want to check their baseline metrics JSON files into source control, so that they can share metrics with one another, and with their continuous integration servers.</li>
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test --performance-metrics-update &lt;mode&gt;</code>, where <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">&lt;mode&gt;</code> is one of <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">{all|new|better|worse|none}</code>. This specifies the behavior SwiftPM should take when writing baseline metrics data into the JSON files at the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">--performance-metrics</code> path.<ul style="margin:1.2em 0px;padding-left:2em;margin:0px;padding-left:1em">
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">all</code>: Write baseline metrics data for all performance test cases. If metrics for those test cases already exist in the JSON, they are overwritten.</li>
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">new</code>: Only write baseline metrics for performance test cases that did not already exist in the baseline metrics JSON. This is the default.</li>
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">better</code>: Only write baseline metrics for performance test cases whose performance has improved compared to the last time they were run. If baseline metrics for those test cases already exist in the JSON, they are overwritten. If baseline metrics for those test cases does not exist in the JSON, they are written to the JSON.</li>
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">worse</code>: Only write baseline metrics for performance test cases whose performance has worsened compared to the last time they were run. If baseline metrics for those test cases already exist in the JSON, they are overwritten. If baseline metrics for those test cases does not exist in the JSON, they are written to the JSON.</li>
</ul>
</li>
</ol>
<h1 id="two-new-command-line-options-for-swift-corelibs-xctest-executables" style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)">Two new command-line options for swift-corelibs-xctest executables</h1>
<ol style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">--performance-metrics &lt;path&gt;</code>. This is a path to a JSON file containing a mapping from test cases to baseline metrics.<ul style="margin:1.2em 0px;padding-left:2em;margin:0px;padding-left:1em">
<li style="margin:0.5em 0px">If not specified, performance tests are not run against any baseline metrics, and so will never fail.</li>
<li style="margin:0.5em 0px">If specified, performance test cases will be run against these metrics. Based on the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">--performance-metrics-update</code> mode (see below), performance test cases may fail if their performance does not meet the baseline.</li>
</ul>
</li>
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">--performance-metrics-update &lt;mode&gt;</code>. Same as the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test --performance-metrics-update</code> parameter.</li>
</ol>
<h1 id="-performancemetrics-directory" style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">PerformanceMetrics</code> directory</h1>
<p style="margin:0px 0px 1.2em!important">If a package’s tests contain any performance tests (i.e.: tests that call <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">XCTestCase.measure()</code>, <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">XCTestCase.measureMetrics()</code>, etc.), running <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test</code> will result in the following directories and files being generated:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248);white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important">MyPackage/
    .build/
    Sources/
    Tests/
        LinuxMain.swift
        MyPackage/
            MyPackageTests.swift
        PerformanceMetrics/  # Generated if any performance tests are run. This is the path specified by --performance-metrics.
            MyPackage/
                Destinations.json                          # Contains a mapping of &quot;runDestinationsByUUID&quot;.
                8CE9E051-9AB6-44AF-8B80-F2DEFD409CB5.json  # An individual run destination&#39;s baseline metrics.
</code></pre><p style="margin:0px 0px 1.2em!important">In order to avoid name collisions, developers will no longer be able to name their test modules “PerformanceMetrics”.</p>
<h1 id="what-happens-when-swift-test-is-run" style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)">What happens when <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test</code> is run</h1>
<ol style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test</code>, using the default arguments, would be the equivalent of <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test --performance-metrics ./Tests/PerformanceMetrics --performance-metrics-update new</code>.</li>
<li style="margin:0.5em 0px">SwiftPM determines which of the destinations defined in <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">Destinations.json</code> to pass to XCTest. For example, if testing on a macOS 64-bit system with one processor, SwiftPM attempts to find a run destination UUID in <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">Destinations.json</code> that matches those criteria. If no <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">Destinations.json</code> file exists, SwiftPM creates a mapping in memory.</li>
<li style="margin:0.5em 0px">SwiftPM invokes <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">LinuxMain.swift</code>, passing swift-corelibs-xctest the path to a run destination’s baseline metrics file (in this case, <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">--performance-metrics 8CE9E051-9AB6-44AF-8B80-F2DEFD409CB5.json</code>), as well as the update behavior (<code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">all</code>, <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">new</code>, <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">better</code>, or <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">worse</code>). This file may not already exist, such as in the case that a <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">Destinations.json</code> file did not exist, or that a JSON file for this particular run destination did not exist.</li>
<li style="margin:0.5em 0px">swift-corelibs-xctest parses the JSON in the baseline metrics JSON file it is given, and stores in memory the mappings from test cases to their baseline metrics. If the file is empty or does not exist, swift-corelibs-xctest stores an empty mapping.</li>
<li style="margin:0.5em 0px">swift-corelibs-xctest runs the tests. If a test exists in the mapping from step 4, it compares its performance to the baseline metric. If the performance is worse, and the update behavior is <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">new</code> or <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">better</code>, the test case is failed.</li>
<li style="margin:0.5em 0px">swift-corelibs-xctest writes to the baseline metrics JSON file, based on the specified update behavior. If the file does not already exist, swift-corelibs-xctest creates the file, then writes to it.</li>
<li style="margin:0.5em 0px">After running the tests, SwiftPM determines whether the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">8CE9E051-9AB6-44AF-8B80-F2DEFD409CB5.json</code> file contains any data. If it does, and this run destination did not exist in <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">Destinations.json</code> in step (2), then SwiftPM writes the new destination to the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">Destinations.json</code> file.</li>
</ol>
<h1 id="how-will-this-work-on-darwin-" style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)">How will this work on Darwin?</h1>
<p style="margin:0px 0px 1.2em!important">I realized while writing this email that I have no clue how to get this working on Darwin. Is it even possible to specify the paths to performance baseline plist files to Apple XCTest on the command line? This seems like a prerequisite to supporting performance testing via SwiftPM on Darwin.</p>
<p style="margin:0px 0px 1.2em!important">It would be great to hear from someone on the developer tools team on this topic (+cc Daniel Dunbar, Mike Ferris). I’ll try and figure out how this works in Apple XCTest, and will send an update when I do.</p>
<h1 id="thoughts-" style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)">Thoughts?</h1>
<p style="margin:0px 0px 1.2em!important">As before, I’d love to hear any feedback you all may have on this proposal.<br><br>- Brian Gesiak</p>
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PjxkaXY+PGJyPjxicj48YnI+PC9kaXY+" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0">​</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jul 24, 2016 at 1:01 PM, Brian Gesiak <span dir="ltr">&lt;<a href="mailto:modocache@gmail.com" target="_blank">modocache@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><p style="margin:0px 0px 1.2em!important">Hello corelibs-dev and build-dev,</p>
<p style="margin:0px 0px 1.2em!important">Back in May, Brian Croom implemented performance testing in swift-corelibs-xctest: <a href="https://github.com/apple/swift-corelibs-xctest/pull/109" target="_blank">https://github.com/apple/swift-corelibs-xctest/pull/109</a></p>
<p style="margin:0px 0px 1.2em!important">I’d love to see Swift developers use this feature to measure the performance of their code. I think we’ll need to add functionality to swift-corelibs-xctest and SwiftPM in order to do so.</p>
<h1 style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)">The problem: recording performance test baselines</h1>
<p style="margin:0px 0px 1.2em!important">In order for performance tests to be useful, Apple’s Xcode provides a way to record “baseline” metrics. Baseline metrics allow a developer to indicate “this performance test should never be slower than 1.2 seconds on average, with 10% standard deviation as ‘wiggle room’”. When Apple XCTest tests are run, they are informed of the baseline metrics that have been set in Xcode. Apple XCTest performance tests that have a baseline registered will fail if performance becomes slower than the acceptable amount.</p>
<p style="margin:0px 0px 1.2em!important">If we could provide swift-corelibs-xctest with a mapping from each performance test to its baseline metric, it would be easy to write the code to fail a test if it didn’t perform well enough. That mapping, however, is the tricky part. Here’s why:</p>
<ul style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">The mapping needs to group metrics based on the host machine running the test. Performance will of course vary based on the hardware, so it’s important to make sure performance baselines set on a Raspberry Pi aren’t used when testing on a Mac Pro.</li>
<li style="margin:0.5em 0px">The mapping also needs to group metrics based on the target machine. Using Apple XCTest, a developer can start a test suite run from their MacBook Pro (macOS 64-bit), and see the results of the performance tests when run on their iPhone 6s (iOS armv7s). I don’t think this is relevant to swift-corelibs-xctest just yet — as far as I know, SwiftPM is not capable of cross-compilation, so the host machine will always be identical to the target machine. Still, we should design something flexible enough for this scenario.</li>
</ul>
<h1 style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)">Xcode’s solution: plist files</h1>
<p style="margin:0px 0px 1.2em!important">Xcode’s solves this problem using two kinds of .plist files. I tried creating a sample project, named <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">Perforate.xcodeproj</code>, which contained a single performance test. Here’s what Xcode created:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248);white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span style="color:rgb(153,153,136);font-style:italic">&lt;!-- Perforate.xcodeproj/xcshareddata/xcbaselines/DA77262F1D447DB300735C93.xcbaseline/Info.plist --&gt;</span>

<span style="color:rgb(153,153,153);font-weight:bold">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span style="color:rgb(153,153,153);font-weight:bold">&lt;!DOCTYPE plist PUBLIC &quot;-//Apple//DTD PLIST 1.0//EN&quot; &quot;<a href="http://www.apple.com/DTDs/PropertyList-1.0.dtd" target="_blank">http://www.apple.com/DTDs/PropertyList-1.0.dtd</a>&quot;&gt;</span>
<span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">plist</span> <span style="color:rgb(0,128,128)">version</span>=<span style="color:rgb(221,17,68)">&quot;1.0&quot;</span>&gt;</span>
<span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
        <span style="color:rgb(153,153,136);font-style:italic">&lt;!-- runDestinationsByUUID: These are the host/target machine groups. --&gt;</span>
        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>runDestinationsByUUID<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                <span style="color:rgb(153,153,136);font-style:italic">&lt;!--
                        It appears each group is given a UUID, but to be honest, I&#39;m not sure why.
                        It seems like these should be &quot;keyed&quot; on aspects of the host/target machines.
                        As-is, I imagine Xcode and Apple XCTest need to traverse each group&#39;s
                        `localComputer`, `targetArchitecture`, and `targetDevice`&#39;s values in order to find a match.
                --&gt;</span>
                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>8CE9E051-9AB6-44AF-8B80-F2DEFD409CB5<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                        <span style="color:rgb(153,153,136);font-style:italic">&lt;!-- Information about the host machine: number of CPUs, cores, etc. --&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>localComputer<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>busSpeedInMHz<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>100<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>cpuCount<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>1<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>cpuKind<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>Intel Core i7<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>cpuSpeedInMHz<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>2800<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>logicalCPUCoresPerPackage<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>8<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>modelCode<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>MacBookPro11,3<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>physicalCPUCoresPerPackage<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>4<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>platformIdentifier<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>com.apple.platform.macosx<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                        <span style="color:rgb(153,153,136);font-style:italic">&lt;!-- The target architecture and device are stored as separate keys. --&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>targetArchitecture<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>x86_64<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>targetDevice<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>modelCode<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>iPhone8,2<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>platformIdentifier<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>com.apple.platform.iphonesimulator<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                <span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
        <span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">plist</span>&gt;</span>
</code></pre>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248);white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span style="color:rgb(153,153,136);font-style:italic">&lt;!-- Perforate.xcodeproj/xcshareddata/xcbaselines/DA77262F1D447DB300735C93.xcbaseline/8CE9E051-9AB6-44AF-8B80-F2DEFD409CB5.plist --&gt;</span>

<span style="color:rgb(153,153,136);font-style:italic">&lt;!-- Notice that this file is named after the `runDestinationsByUUID` key from the first file: 8CE9E051-9AB6-44AF-8B80-F2DEFD409CB5. --&gt;</span>

<span style="color:rgb(153,153,153);font-weight:bold">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span style="color:rgb(153,153,153);font-weight:bold">&lt;!DOCTYPE plist PUBLIC &quot;-//Apple//DTD PLIST 1.0//EN&quot; &quot;<a href="http://www.apple.com/DTDs/PropertyList-1.0.dtd" target="_blank">http://www.apple.com/DTDs/PropertyList-1.0.dtd</a>&quot;&gt;</span>
<span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">plist</span> <span style="color:rgb(0,128,128)">version</span>=<span style="color:rgb(221,17,68)">&quot;1.0&quot;</span>&gt;</span>
<span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>classNames<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>PerforateTests<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                        <span style="color:rgb(153,153,136);font-style:italic">&lt;!-- The metrics are mapped by class name and test method name to performance metrics. --&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>test_uniqueOrdered_performance<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                                <span style="color:rgb(153,153,136);font-style:italic">&lt;!-- There are several categories of performance metrics. The only one publicly available in Apple XCTest so far is wall clock time. --&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>com.apple.XCTPerformanceMetric_WallClockTime<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>baselineAverage<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">real</span>&gt;</span>0.5<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">real</span>&gt;</span>
                                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>baselineIntegrationDisplayName<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>Local Baseline<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                                <span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                        <span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                <span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
        <span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
<span style="color:rgb(0,0,128);font-weight:normal">&lt;/<span style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">plist</span>&gt;</span>
</code></pre>
<h1 style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)">Proposed solution for SwiftPM/swift-corelibs-xctest: JSON files</h1>
<p style="margin:0px 0px 1.2em!important">I think we can mimic Xcode’s approach here. Here’s what I’m proposing:</p>
<ul style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">swift-corelibs-xctest’s test runner should take a <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">--performance-metrics &lt;PATH&gt;</code> argument, where <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">&lt;PATH&gt;</code> is the location of a file containing JSON that looks pretty much exactly like the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">8CE9E051-9AB6-44AF-8B80-F2DEFD409CB5.plist</code> from above:</li>
</ul>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248);white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)">{
  &quot;<span style="color:rgb(0,128,128)">classNames</span>&quot;: <span>{
    &quot;<span style="color:rgb(0,128,128)">PerforateTests</span>&quot;: <span>{
      &quot;<span style="color:rgb(0,128,128)">test_uniqueOrdered_performance</span>&quot;: <span>{
        &quot;<span style="color:rgb(0,128,128)">baselineAverage</span>&quot;: <span><span style="color:rgb(221,17,68)">&quot;0.5&quot;</span></span>,
        &quot;<span style="color:rgb(0,128,128)">baselineIntegrationDisplayName</span>&quot;: <span><span style="color:rgb(221,17,68)">&quot;Local Baseline&quot;</span>
      </span>}
    </span>}
  </span>}
</span>}
</code></pre>
<ul style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">SwiftPM’s <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test</code> command should also take a <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">--performance-metrics &lt;PATH&gt;</code> argument, where <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">&lt;PATH&gt;</code> is the location of a file containing JSON that looks pretty much exactly like the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">xcbaselines/DA77262F1D447DB300735C93.xcbaseline/Info.plist</code> from above (by default, <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">--performance-metrics</code> could be set to the same path as the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">swift test --build-path</code> directory): </li>
</ul>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248);white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)">{
  &quot;runDestinationsByUUID&quot;: {
    &quot;8CE9E051-9AB6-44AF-8B80-F2DEFD409CB5&quot;: {
      &quot;localComputer&quot;: {
        &quot;busSpeedInMHz&quot;: &quot;100&quot;,
        # ...
      },
      &quot;targetArchitecture&quot;: &quot;x86_64&quot;,
      &quot;targetDevice&quot;: {
        # We might need to change these keys, since &quot;modelCode&quot; seems very Apple-specific.
        &quot;modelCode&quot;: &quot;linux&quot;,
        &quot;platformIdentifier&quot;: &quot;Ubuntu 15.04&quot;,
      }
    }
  }
}
</code></pre>
<p style="margin:0px 0px 1.2em!important">Personally, I think the format of the plist files Xcode and Apple XCTest generate could be improved. Still, I think it’d be nice to stick to the same format (as much as possible) for swift-corelibs-xctest, just to keep things simple.</p>
<h1 style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.6em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(221,221,221)">Thoughts?</h1>
<p style="margin:0px 0px 1.2em!important">I admit that I don’t have much experience using Apple XCTest’s performance testing functionality, so I might be missing something here. Does anyone have any feedback on this idea? I’d like to incorporate your feedback, and perhaps submit a Swift Evolution proposal for this feature.</p><span class="HOEnZb"><font color="#888888"><p style="margin:0px 0px 1.2em!important">- Brian Gesiak</p>
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</blockquote></div><br></div>