On Sunday, May 30, 2021 at 12:54:02 PM UTC-4 axel.wa...@googlemail.com wrote:
> That is very normal for micro-benchmarks on a ns scale. > The results are so constantly that I think it is more related to CPU cache and the specified directives. > > On Sun, May 30, 2021 at 6:07 PM tapi...@gmail.com <tapi...@gmail.com> > wrote: > >> It is some strange that if any of the bool/byte/int16/int64 benchmarks is >> removed in this test file https://play.golang.org/p/w29J9VhtzYH, >> then the benchmark result is like: >> >> Benchmark_CopyStruct_3_fields-4 1000000000 0.7780 ns/op >> Benchmark_CopyStruct_4_fields-4 1000000000 0.7513 ns/op >> >> Otherwise, it is like: >> >> Benchmark_CopyStruct_3_fields-4 1000000000 1.501 ns/op >> Benchmark_CopyStruct_4_fields-4 1000000000 0.7755 ns/op >> >> In other words, it looks there is mutual interference between benchmarks. >> >> On Saturday, May 29, 2021 at 11:49:47 PM UTC-4 tapi...@gmail.com wrote: >> >>> The benchmark code: https://play.golang.org/p/bC1zO14eNeh >>> >>> The result: >>> >>> $ go test -bench=. >>> goos: linux >>> goarch: amd64 >>> pkg: example.com/valuecopy >>> cpu: Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz >>> Benchmark_CopyBool-4 1000000000 0.8885 >>> ns/op >>> Benchmark_CopyByte-4 1000000000 0.8872 >>> ns/op >>> Benchmark_CopyInt16-4 1000000000 0.8785 >>> ns/op >>> Benchmark_CopyInt32-4 1000000000 0.8854 >>> ns/op >>> Benchmark_CopyInt64-4 1000000000 0.8831 >>> ns/op >>> Benchmark_CopyPointer-4 911733464 1.330 ns/op >>> Benchmark_CopyString-4 901249356 1.325 ns/op >>> Benchmark_CopySlice-4 664187247 1.765 ns/op >>> Benchmark_CopyArray_2_elements-4 1000000000 0.8874 >>> ns/op >>> Benchmark_CopyArray_3_elements-4 1000000000 1.096 >>> ns/op >>> Benchmark_CopyArray_4_elements-4 1000000000 1.105 >>> ns/op >>> Benchmark_CopyArray_5_elements-4 534542524 2.202 ns/op >>> Benchmark_CopyArray_6_elements-4 727849554 1.606 ns/op >>> Benchmark_CopyArray_7_elements-4 444494692 2.649 ns/op >>> Benchmark_CopyArray_8_elements-4 584854867 1.993 ns/op >>> Benchmark_CopyArray_9_elements-4 389639859 3.083 ns/op >>> Benchmark_CopyArray_10_elements-4 267380602 4.418 ns/op >>> Benchmark_CopyArray_11_elements-4 242644033 4.867 ns/op >>> Benchmark_CopyArray_12_elements-4 268304104 4.498 ns/op >>> Benchmark_CopyArray_13_elements-4 82165272 14.46 ns/op >>> Benchmark_CopyStruct_2_fields-4 1000000000 0.5029 >>> ns/op >>> Benchmark_CopyStruct_3_fields-4 671136589 1.769 ns/op >>> Benchmark_CopyStruct_4_fields-4 1000000000 0.8785 >>> ns/op >>> Benchmark_CopyStruct_5_fields-4 530876049 2.202 ns/op >>> Benchmark_CopyStruct_6_fields-4 723380257 1.581 ns/op >>> Benchmark_CopyStruct_7_fields-4 444619906 2.636 ns/op >>> Benchmark_CopyStruct_8_fields-4 588605260 1.968 ns/op >>> Benchmark_CopyStruct_9_fields-4 387253551 3.073 ns/op >>> Benchmark_CopyStruct_10_fields-4 267450452 4.396 ns/op >>> Benchmark_CopyStruct_11_fields-4 246289522 4.855 ns/op >>> Benchmark_CopyStruct_12_fields-4 266212528 4.426 ns/op >>> Benchmark_CopyStruct_13_fields-4 207298701 5.739 ns/op >>> >>> From the benchmark result, it looks >>> * the cost of copying a [13]int value is much larger than copying a >>> [12]int value. >>> * the cost of copying a struct{a, b, c int} value is about double of >>> copying a struct{a, b, c, d int} value. >>> >>> >>> -- >> You received this message because you are subscribed to the Google Groups >> "golang-nuts" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to golang-nuts...@googlegroups.com. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/golang-nuts/f53a8f05-37a6-4c86-87c1-de9e83f381fdn%40googlegroups.com >> >> <https://groups.google.com/d/msgid/golang-nuts/f53a8f05-37a6-4c86-87c1-de9e83f381fdn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/6caafbc0-66f3-4b77-ac92-6174b17ebf30n%40googlegroups.com.
