mirror of https://github.com/golang/go.git
a2eb53c571
Also fix BenchmarkAtof64Random* to initialize the test data when none
of the TestAtof* tests are run.
Passing "go test -test.count=5 -test.run=xxx -test.bench=Atof64" on to
benchstat:
name old time/op new time/op delta
Atof64Decimal-4 47.9ns ± 0% 48.3ns ± 1% ~ (p=0.238 n=4+5)
Atof64Float-4 58.3ns ± 3% 57.7ns ± 0% ~ (p=0.151 n=5+5)
Atof64FloatExp-4 107ns ± 0% 71ns ± 1% -33.89% (p=0.016 n=4+5)
Atof64Big-4 163ns ± 0% 166ns ± 2% ~ (p=0.159 n=4+5)
Atof64RandomBits-4 299ns ± 1% 166ns ± 1% -44.41% (p=0.008 n=5+5)
Atof64RandomFloats-4 188ns ± 1% 144ns ± 0% -23.03% (p=0.008 n=5+5)
The canada.json file from github.com/miloyip/nativejson-benchmark is
full of geospatial coordinates (i.e. numbers). With this program:
src, _ := ioutil.ReadFile("canada.json")
for i := 0; i < 5; i++ {
now := time.Now()
for j := 0; j < 10; j++ {
dst := interface{}(nil)
if err := json.Unmarshal(src, &dst); err != nil {
log.Fatal(err)
}
}
fmt.Println(time.Since(now))
}
Median of the 5 printed numbers, lower is better.
Before: 760.819549ms
After: 702.651646ms
Ratio: 1.08x
The new detailedPowersOfTen table weighs in at 596 * 16 = 9536 bytes,
but some of that weight gain can be clawed back, in a follow-up commit,
that folds in the existing powersOfTen table in extfloat.go.
RELNOTE=yes
Change-Id: I3953110deaa1f5f6941e88e8417c4665b649ed80
Reviewed-on: https://go-review.googlesource.com/c/go/+/260858
Run-TryBot: Nigel Tao <nigeltao@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Nigel Tao <nigeltao@golang.org>
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