[swift-users] Need clarification on Swift CI benchmark

Proyb P proyb6 at gmail.com
Fri Apr 21 09:32:15 CDT 2017

Not sure if your explaination is correct, I think the Apple team explained
Speedup <1.0x is slower under Regression and >1.0x is faster under

The table seriously need improvement or everyone will be confused.

On Fri, Apr 21, 2017 at 12:27 AM, Saagar Jha <saagar at saagarjha.com> wrote:

> Delta is (OLD_MIN - NEW_MIN) / OLD_MIN expressed as a percent; speedup is
> (OLD_MIN - NEW_MIN) / NEW_MIN as a decimal. A negative delta corresponds to
> a speedup less than 1 (i.e the newer one is slower) and a positive delta to
> a speedup greater than one (i.e. the newer one is faster).
> Saagar Jha
> On Apr 20, 2017, at 07:48, Proyb P via swift-users <swift-users at swift.org>
> wrote:
> What those PR in Swift CI benchmark shown "Regression", "Old_min",
> "new_min", "delta" and "speedup" really mean? Speedup can be confusing when
> Delta is either a positive or negative value.
> https://github.com/apple/swift/pull/3796
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