[swift-users] Need clarification on Swift CI benchmark

Saagar Jha saagar at saagarjha.com
Thu Apr 20 11:27:39 CDT 2017

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 <https://github.com/apple/swift/pull/3796>
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