<div dir="ltr"><div class="markdown-here-wrapper" style=""><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">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 id="the-problem-recording-performance-test-baselines" 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 id="xcode-s-solution-plist-files" 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 class="hljs language-xml" 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;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">&lt;!-- Perforate.xcodeproj/xcshareddata/xcbaselines/DA77262F1D447DB300735C93.xcbaseline/Info.plist --&gt;</span>

<span class="hljs-pi" style="color:rgb(153,153,153);font-weight:bold">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="hljs-doctype" 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">http://www.apple.com/DTDs/PropertyList-1.0.dtd</a>&quot;&gt;</span>
<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">plist</span> <span class="hljs-attribute" style="color:rgb(0,128,128)">version</span>=<span class="hljs-value" style="color:rgb(221,17,68)">&quot;1.0&quot;</span>&gt;</span>
<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
        <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">&lt;!-- runDestinationsByUUID: These are the host/target machine groups. --&gt;</span>
        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>runDestinationsByUUID<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                <span class="hljs-comment" 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 class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" 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 class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                        <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">&lt;!-- Information about the host machine: number of CPUs, cores, etc. --&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>localComputer<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>busSpeedInMHz<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>100<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>cpuCount<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>1<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>cpuKind<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" 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 class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>cpuSpeedInMHz<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>2800<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>logicalCPUCoresPerPackage<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>8<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>modelCode<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>MacBookPro11,3<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>physicalCPUCoresPerPackage<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>4<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">integer</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>platformIdentifier<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" 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 class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                        <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">&lt;!-- The target architecture and device are stored as separate keys. --&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>targetArchitecture<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>x86_64<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>targetDevice<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>modelCode<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>iPhone8,2<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>platformIdentifier<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" 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 class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" 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 class="hljs language-xml" 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;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span class="hljs-comment" 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 class="hljs-comment" 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 class="hljs-pi" style="color:rgb(153,153,153);font-weight:bold">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="hljs-doctype" 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">http://www.apple.com/DTDs/PropertyList-1.0.dtd</a>&quot;&gt;</span>
<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">plist</span> <span class="hljs-attribute" style="color:rgb(0,128,128)">version</span>=<span class="hljs-value" style="color:rgb(221,17,68)">&quot;1.0&quot;</span>&gt;</span>
<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>classNames<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>PerforateTests<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                        <span class="hljs-comment" 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 class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" 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 class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                                <span class="hljs-comment" 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 class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" 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 class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>baselineAverage<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">real</span>&gt;</span>0.5<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">real</span>&gt;</span>
                                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>baselineIntegrationDisplayName<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">key</span>&gt;</span>
                                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>Local Baseline<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">string</span>&gt;</span>
                                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
                <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
        <span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">dict</span>&gt;</span>
<span class="hljs-tag" style="color:rgb(0,0,128);font-weight:normal">&lt;/<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(0,0,128);font-weight:normal">plist</span>&gt;</span>
</code></pre>
<h1 id="proposed-solution-for-swiftpm-swift-corelibs-xctest-json-files" 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 class="hljs language-json" 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;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)">{
  &quot;<span class="hljs-attribute" style="color:rgb(0,128,128)">classNames</span>&quot;: <span class="hljs-value">{
    &quot;<span class="hljs-attribute" style="color:rgb(0,128,128)">PerforateTests</span>&quot;: <span class="hljs-value">{
      &quot;<span class="hljs-attribute" style="color:rgb(0,128,128)">test_uniqueOrdered_performance</span>&quot;: <span class="hljs-value">{
        &quot;<span class="hljs-attribute" style="color:rgb(0,128,128)">baselineAverage</span>&quot;: <span class="hljs-value"><span class="hljs-string" style="color:rgb(221,17,68)">&quot;0.5&quot;</span></span>,
        &quot;<span class="hljs-attribute" style="color:rgb(0,128,128)">baselineIntegrationDisplayName</span>&quot;: <span class="hljs-value"><span class="hljs-string" 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 class="hljs language-json" 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;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 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">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><p style="margin:0px 0px 1.2em!important">- Brian Gesiak</p>
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