| commit | e4371fb179ad69cbd057f2430120843948e09f2f | [log] [tgz] |
|---|---|---|
| author | Russ Cox <rsc@golang.org> | Fri Feb 03 19:26:13 2017 -0500 |
| committer | Russ Cox <rsc@golang.org> | Thu Feb 09 14:45:16 2017 +0000 |
| tree | 4e49771324f1f6bd35b2b962a9511fb9bb071455 | |
| parent | 3a6842a0ecf66cf06ce4f0a5fcb9c09fbfdbecc1 [diff] |
time: optimize Now on darwin, windows Fetch both monotonic and wall time together when possible. Avoids skew and is cheaper. Also shave a few ns off in conversion in package time. Compared to current implementation (after monotonic changes): name old time/op new time/op delta Now 19.6ns ± 1% 9.7ns ± 1% -50.63% (p=0.000 n=41+49) darwin/amd64 Now 23.5ns ± 4% 10.6ns ± 5% -54.61% (p=0.000 n=30+28) windows/amd64 Now 54.5ns ± 5% 29.8ns ± 9% -45.40% (p=0.000 n=27+29) windows/386 More importantly, compared to Go 1.8: name old time/op new time/op delta Now 9.5ns ± 1% 9.7ns ± 1% +1.94% (p=0.000 n=41+49) darwin/amd64 Now 12.9ns ± 5% 10.6ns ± 5% -17.73% (p=0.000 n=30+28) windows/amd64 Now 15.3ns ± 5% 29.8ns ± 9% +94.36% (p=0.000 n=30+29) windows/386 This brings time.Now back in line with Go 1.8 on darwin/amd64 and windows/amd64. It's not obvious why windows/386 is still noticeably worse than Go 1.8, but it's better than before this CL. The windows/386 speed is not too important; the changes just keep the two architectures similar. Change-Id: If69b94970c8a1a57910a371ee91e0d4e82e46c5d Reviewed-on: https://go-review.googlesource.com/36428 Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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