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@dfinkel Output of
Description
Go version
go version go1.26-devel_8bcda6c79d Fri Aug 29 23:57:12 2025 -0700 linux/amd64
Output of go env
in your module/workspace:
AR='ar' CC='gcc' CGO_CFLAGS='-O2 -g' CGO_CPPFLAGS='' CGO_CXXFLAGS='-O2 -g' CGO_ENABLED='1' CGO_FFLAGS='-O2 -g' CGO_LDFLAGS='-O2 -g' CXX='g++' GCCGO='/usr/bin/gccgo' GO111MODULE='' GOAMD64='v3' GOARCH='amd64' GOAUTH='netrc' GOBIN='' GOCACHE='/home/david/.cache/go-build' GOCACHEPROG='' GODEBUG='' GOENV='/home/david/.config/go/env' GOEXE='' GOEXPERIMENT='' GOFIPS140='off' GOFLAGS='' GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1806117217=/tmp/go-build -gno-record-gcc-switches' GOHOSTARCH='amd64' GOHOSTOS='linux' GOINSECURE='' GOMOD='/home/david/src/go/src/golang.spin-2.net/gf2npoly/go.mod' GOMODCACHE='/home/david/src/go/pkg/mod' GONOPROXY='' GONOSUMDB='' GOOS='linux' GOPATH='/home/david/src/go:' GOPRIVATE='' GOPROXY='https://proxy.golang.org,direct' GOROOT='/home/david/sdk/gotip' GOSUMDB='sum.golang.org' GOTELEMETRY='local' GOTELEMETRYDIR='/home/david/.config/go/telemetry' GOTMPDIR='' GOTOOLCHAIN='auto' GOTOOLDIR='/home/david/sdk/gotip/pkg/tool/linux_amd64' GOVCS='' GOVERSION='go1.26-devel_8bcda6c79d Fri Aug 29 23:57:12 2025 -0700' GOWORK='' PKG_CONFIG='pkg-config'
What did you do?
I converted the benchmarks in golang.spin-2.net/gf2npoly to use for B.Loop()
instead of for range B.N
Running go test -bench Bench/public -count 3 -benchtime 5s .
What did you see happen?
% gotip test -bench Bench/public -count 3 -benchtime 5s . pts/1471701
goos: linux
goarch: amd64
pkg: golang.spin-2.net/gf2npoly
cpu: AMD Ryzen 9 5900X 12-Core Processor
BenchmarkGF2Mul64/public-24 1000000000 5.000 ns/op
BenchmarkGF2Mul64/public-24 1000000000 5.000 ns/op
BenchmarkGF2Mul64/public-24 1000000000 5.000 ns/op
BenchmarkGF2Mul64All1s/public-24 1000000000 5.000 ns/op
BenchmarkGF2Mul64All1s/public-24 1000000000 5.000 ns/op
BenchmarkGF2Mul64All1s/public-24 1000000000 5.000 ns/op
PASS
ok golang.spin-2.net/gf2npoly 30.009s
What did you expect to see?
% ~/src/build/compilers/go/bin/go test -bench Bench/public -count 3 -benchtime 2s . pts/1471707
goos: linux
goarch: amd64
pkg: golang.spin-2.net/gf2npoly
cpu: AMD Ryzen 9 5900X 12-Core Processor
BenchmarkGF2Mul64/public-24 747061556 3.199 ns/op
BenchmarkGF2Mul64/public-24 747226730 3.190 ns/op
BenchmarkGF2Mul64/public-24 746786904 3.189 ns/op
BenchmarkGF2Mul64All1s/public-24 698037858 3.396 ns/op
BenchmarkGF2Mul64All1s/public-24 706759926 3.406 ns/op
BenchmarkGF2Mul64All1s/public-24 708699562 3.404 ns/op
PASS
ok golang.spin-2.net/gf2npoly 14.354s