On Mon, Apr 18, 2022 at 1:14 PM Feng Tian <feng...@gmail.com> wrote: > > Hi, I have the following simple benchmark code, > > https://go.dev/play/p/m1ClnbdbdWi > > I run this on my laptop since Go playground does not run benchmark code. > The strange thing is that Copy of float64 is slower than copy using generics. > I can imagine generics may add no overhead, but how can it be faster? > > ftian@DESKTOP-16FCU43:~/tmp$ go test -bench=. > goos: linux > goarch: amd64 > pkg: a > cpu: 11th Gen Intel(R) Core(TM) i7-11370H @ 3.30GHz > BenchmarkCopy-8 5693944 221.7 ns/op > BenchmarkCopyG-8 8885454 137.1 ns/op > PASS > ok a 2.838s
The numbers for this kind of micro-benchmark can be deceptive. For example, they can be highly affected by alignment of the instruction loop. I don't know exactly what is happening for you. I compiled the code with "go test -c" and disassembled it: both benchmark functions contained exactly the same instructions. Ian -- 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/CAOyqgcUHurTzm5c%3DoU3ka2F8u4vew74dFKf32QuqSe7KRdBhwQ%40mail.gmail.com.
