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05ca34093b
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Alberto Donizetti 05ca34093b testing: only compute b.N once when passed -count > 1 
When running a benchmark multiple times, instead of re-computing the
value of b.N each time, use the value found by the first run.

For

  go test -bench=. -benchtime 3s -count 2 p_test.go

on the benchmark in the linked issue; before:

  BenchmarkBenchmark-4   	     500	  10180593 ns/op
  --- BENCH: BenchmarkBenchmark-4
  	  p_test.go:13: single call took 10.111079ms
  	  p_test.go:13: single call took 1.017298685s
  	  p_test.go:13: single call took 5.090096124s
  BenchmarkBenchmark-4   	     500	  10182164 ns/op
  --- BENCH: BenchmarkBenchmark-4
  	  p_test.go:13: single call took 10.098169ms
  	  p_test.go:13: single call took 1.017712905s
  	  p_test.go:13: single call took 5.090898517s
  PASS
  ok  	command-line-arguments	12.244s

and after:

  BenchmarkBenchmark-4   	     500	  10177076 ns/op
  --- BENCH: BenchmarkBenchmark-4
  	  p_test.go:13: single call took 10.091301ms
  	  p_test.go:13: single call took 1.016943125s
  	  p_test.go:13: single call took 5.088376028s
  BenchmarkBenchmark-4   	     500	  10171497 ns/op
  --- BENCH: BenchmarkBenchmark-4
  	  p_test.go:13: single call took 10.140245ms
  	  p_test.go:13: single call took 5.085605921s
  PASS
  ok  	command-line-arguments	11.218s

Fixes #23423

Change-Id: Ie66a8c5ac43881eb8741e14105db28745b4d56d3
Reviewed-on: https://go-review.googlesource.com/110775
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-05-14 17:07:43 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api syscall: introduce Pointer type and use it instead of uintptr 2018-04-18 08:50:42 +00:00
doc doc/contribute.html: clean up HTML and formatting 2018-05-14 04:21:05 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc misc/ios: forward SIGQUIT to the iOS program 2018-05-11 16:47:28 +00:00
src testing: only compute b.N once when passed -count > 1 2018-05-14 17:07:43 +00:00
test cmd/compile: assign and preserve statement boundaries. 2018-05-14 14:09:49 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update email address 2018-04-14 19:28:37 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Iskander Sharipov's individual CLA mail 2018-04-16 04:49:46 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README: update number of contributors 2018-04-03 22:10:32 +00:00
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