This is a port of the Java's LongAdder into the Go programming language.
package test
import "github.com/fangwentong/go-adder"
import "context"
var counter = &adder.LongAdder{}
func ExampleFunc(ctx context.Context) {
// inject goroutine probe
var probe int32
ctx = adder.ContextWithProbe(ctx, &probe)
counter.Add(ctx, 2)
counter.Add(ctx, -2)
// counter +1
counter.Increment(ctx)
// counter -1
counter.Decrement(ctx)
// get current count
counter.Sum()
// reset current count
counter.Reset()
// get current count then reset
counter.SumThenRest()
}running on MacOS powered by Intel Coffee Lake 6 core 12 thread
$ go test -run=nothing -bench=. -cpu=1,2,4,8,16,32,64,128 -benchtime=5s
goos: darwin
goarch: amd64
pkg: github.com/fangwentong/go-adder
cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
BenchmarkLongAdder 691230033 8.824 ns/op
BenchmarkLongAdder-2 687713216 18.45 ns/op
BenchmarkLongAdder-4 477778184 12.29 ns/op
BenchmarkLongAdder-8 1000000000 2.966 ns/op
BenchmarkLongAdder-16 1000000000 2.573 ns/op
BenchmarkLongAdder-32 1000000000 2.025 ns/op
BenchmarkLongAdder-64 1000000000 2.373 ns/op
BenchmarkLongAdder-128 1000000000 2.297 ns/op
BenchmarkLongAdderEmptyCtx 519916878 12.42 ns/op
BenchmarkLongAdderEmptyCtx-2 160806240 36.50 ns/op
BenchmarkLongAdderEmptyCtx-4 172157611 32.71 ns/op
BenchmarkLongAdderEmptyCtx-8 222932665 28.26 ns/op
BenchmarkLongAdderEmptyCtx-16 231772944 26.73 ns/op
BenchmarkLongAdderEmptyCtx-32 238532882 24.33 ns/op
BenchmarkLongAdderEmptyCtx-64 254754256 24.61 ns/op
BenchmarkLongAdderEmptyCtx-128 244789734 24.35 ns/op
BenchmarkAtomicLong 802940997 6.566 ns/op
BenchmarkAtomicLong-2 366768531 15.57 ns/op
BenchmarkAtomicLong-4 388438527 15.96 ns/op
BenchmarkAtomicLong-8 361224614 16.80 ns/op
BenchmarkAtomicLong-16 385923369 18.04 ns/op
BenchmarkAtomicLong-32 370266336 15.54 ns/op
BenchmarkAtomicLong-64 387258997 16.38 ns/op
BenchmarkAtomicLong-128 307278933 18.82 ns/op
PASS
ok github.com/fangwentong/go-adder 177.124s
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