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Dmitry Vyukov fc3f8d43f1 time: speed up Since and Until 
time.now is somewhat expensive (much more expensive than nanotime),
in the common case when Time has monotonic time we don't actually
need to call time.now in Since/Until as we can do calculation
based purely on monotonic times.

name                  old time/op  new time/op  delta
TCP4OneShotTimeout-6  17.0µs ± 0%  17.1µs ± 1%     ~     (p=0.151 n=5+5)
SetReadDeadline-6      261ns ± 0%   234ns ± 1%  -10.35%  (p=0.008 n=5+5)

Benchmark that only calls Until:

benchmark            old ns/op     new ns/op     delta
BenchmarkUntil       54.0          29.5          -45.37%

Update #25729

Change-Id: I5ac5af3eb1fe9f583cf79299f10b84501b1a0d7d
Reviewed-on: https://go-review.googlesource.com/c/146341
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-11-02 12:50:18 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api syscall: FreeBSD 12 ino64 support 2018-10-05 21:38:13 +00:00
doc doc/go1.12: initial add of release notes for Go 1.12 2018-11-01 20:29:34 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc cmd/cgo: don't update each call in place 2018-11-02 05:35:56 +00:00
src time: speed up Since and Until 2018-11-02 12:50:18 +00:00
test cmd/compile: implement some moves using non-overlapping reads&writes 2018-10-30 20:27:03 +00:00
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AUTHORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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