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path: root/src/math/rand/default_test.go
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2025-10-17all: remove unnecessary loop variable copies in testsTobias Klauser
Copying the loop variable is no longer necessary since Go 1.22. Change-Id: Iebb21dac44a20ec200567f1d786f105a4ee4999d Reviewed-on: https://go-review.googlesource.com/c/go/+/711640 Reviewed-by: Florian Lehner <lehner.florian86@gmail.com> Auto-Submit: Damien Neil <dneil@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Damien Neil <dneil@google.com> Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2025-02-25all: surround -test.run arguments with ^$qmuntal
If the -test.run value is not surrounded by ^$ then any test that matches the -test.run value will be run. This is normally not the desired behavior, as it can lead to unexpected tests being run. Change-Id: I3447aaebad5156bbef7f263cdb9f6b8c32331324 Reviewed-on: https://go-review.googlesource.com/c/go/+/651956 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2024-09-03math,os,os/*: use testenv.ExecutableKir Kolyshkin
As some callers don't have a testing context, modify testenv.Executable to accept nil (similar to how testenv.GOROOT works). Change-Id: I39112a7869933785a26b5cb6520055b3cc42b847 Reviewed-on: https://go-review.googlesource.com/c/go/+/609835 Reviewed-by: Ian Lance Taylor <iant@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
2023-02-07math/rand: use fastrand64 if possibleIan Lance Taylor
Now that the top-level math/rand functions are auto-seeded by default (issue #54880), use the runtime fastrand64 function when 1) Seed has not been called; 2) the GODEBUG randautoseed=0 is not used. The benchmarks run quickly and are relatively noisy, but they show significant improvements for parallel calls to the top-level functions. goos: linux goarch: amd64 pkg: math/rand cpu: 11th Gen Intel(R) Core(TM) i7-11850H @ 2.50GHz │ /tmp/foo.1 │ /tmp/foo.2 │ │ sec/op │ sec/op vs base │ Int63Threadsafe-16 11.605n ± 1% 3.094n ± 1% -73.34% (p=0.000 n=10) Int63ThreadsafeParallel-16 67.8350n ± 2% 0.4000n ± 1% -99.41% (p=0.000 n=10) Int63Unthreadsafe-16 1.947n ± 3% 1.924n ± 2% ~ (p=0.189 n=10) Intn1000-16 4.295n ± 2% 4.287n ± 3% ~ (p=0.517 n=10) Int63n1000-16 4.379n ± 0% 4.192n ± 2% -4.27% (p=0.000 n=10) Int31n1000-16 3.641n ± 3% 3.506n ± 0% -3.69% (p=0.000 n=10) Float32-16 3.330n ± 7% 3.250n ± 2% -2.40% (p=0.017 n=10) Float64-16 2.194n ± 6% 2.056n ± 4% -6.31% (p=0.004 n=10) Perm3-16 43.39n ± 9% 38.28n ± 12% -11.77% (p=0.015 n=10) Perm30-16 324.4n ± 6% 315.9n ± 19% ~ (p=0.315 n=10) Perm30ViaShuffle-16 175.4n ± 1% 143.6n ± 2% -18.15% (p=0.000 n=10) ShuffleOverhead-16 223.4n ± 2% 215.8n ± 1% -3.38% (p=0.000 n=10) Read3-16 5.428n ± 3% 5.406n ± 2% ~ (p=0.780 n=10) Read64-16 41.55n ± 5% 40.14n ± 3% -3.38% (p=0.000 n=10) Read1000-16 622.9n ± 4% 594.9n ± 2% -4.50% (p=0.000 n=10) Concurrent-16 136.300n ± 2% 4.647n ± 26% -96.59% (p=0.000 n=10) geomean 23.40n 12.15n -48.08% Fixes #49892 Change-Id: Iba75b326145512ab0b7ece233b98ac3d4e1fb504 Reviewed-on: https://go-review.googlesource.com/c/go/+/465037 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> Auto-Submit: Ian Lance Taylor <iant@google.com>