Created
February 12, 2021 18:02
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Cgo usleep vs. pure Go time.Sleep. Run with `go test -bench=.`
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package ctest | |
// #include <time.h> | |
// void wait(int usec) | |
// { | |
// usleep(usec); | |
// } | |
import "C" | |
import "time" | |
func CUsleep(i int) { | |
C.wait(C.int(i)) | |
} | |
func GUsleep(i int) { | |
time.Sleep(time.Duration(i) * 1000) | |
} |
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package ctest_test | |
import ( | |
"bench/ctest" | |
"testing" | |
) | |
func benchGUSleep(u int, b *testing.B) { | |
for i := 0; i < b.N; i++ { | |
ctest.GUsleep(u) | |
} | |
} | |
func benchCUSleep(u int, b *testing.B) { | |
for i := 0; i < b.N; i++ { | |
ctest.CUsleep(u) | |
} | |
} | |
func BenchmarkCUsleep0(b *testing.B) { benchCUSleep(0, b) } | |
func BenchmarkCUsleep1(b *testing.B) { benchCUSleep(1, b) } | |
func BenchmarkCUsleep2(b *testing.B) { benchCUSleep(2, b) } | |
func BenchmarkCUsleep10(b *testing.B) { benchCUSleep(10, b) } | |
func BenchmarkCUsleep50(b *testing.B) { benchCUSleep(50, b) } | |
func BenchmarkCUsleep100(b *testing.B) { benchCUSleep(100, b) } | |
func BenchmarkCUsleep1000(b *testing.B) { benchCUSleep(1000, b) } | |
func BenchmarkGUsleep0(b *testing.B) { benchGUSleep(0, b) } | |
func BenchmarkGUsleep1(b *testing.B) { benchGUSleep(1, b) } | |
func BenchmarkGUsleep2(b *testing.B) { benchGUSleep(2, b) } | |
func BenchmarkGUsleep10(b *testing.B) { benchGUSleep(10, b) } | |
func BenchmarkGUsleep50(b *testing.B) { benchGUSleep(50, b) } | |
func BenchmarkGUsleep100(b *testing.B) { benchGUSleep(100, b) } | |
func BenchmarkGUsleep1000(b *testing.B) { benchGUSleep(1000, b) } |
$ go version
go version go1.15.2 linux/amd64
BenchmarkCUsleep0-4 20474 59241 ns/op 0 B/op 0 allocs/op
BenchmarkCUsleep1-4 20268 59830 ns/op 0 B/op 0 allocs/op
BenchmarkCUsleep2-4 19390 61233 ns/op 0 B/op 0 allocs/op
BenchmarkCUsleep10-4 17448 68566 ns/op 0 B/op 0 allocs/op
BenchmarkCUsleep50-4 10000 111465 ns/op 0 B/op 0 allocs/op
BenchmarkCUsleep100-4 6894 166218 ns/op 0 B/op 0 allocs/op
BenchmarkCUsleep1000-4 1053 1157965 ns/op 0 B/op 0 allocs/op
BenchmarkGUsleep0-4 421654693 2.83 ns/op 0 B/op 0 allocs/op
BenchmarkGUsleep1-4 204738 5826 ns/op 0 B/op 0 allocs/op
BenchmarkGUsleep2-4 118904 8905 ns/op 0 B/op 0 allocs/op
BenchmarkGUsleep10-4 15459 77754 ns/op 0 B/op 0 allocs/op
BenchmarkGUsleep50-4 14258 84088 ns/op 0 B/op 0 allocs/op
BenchmarkGUsleep100-4 6842 174307 ns/op 0 B/op 0 allocs/op
BenchmarkGUsleep1000-4 1028 1168554 ns/op 0 B/op 0 allocs/op
oh dude~.thanks~
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what is the result?