On Wed, Jul 28, 2021 at 7:30 PM tapi...@gmail.com <tapir....@gmail.com> wrote:
> I think this one is different from previous. I don't criticize Go, I just > seek reasons. > Implying that previously you've been criticizing Go? As for your search for reasons: 16384 is a power of two. So I assume that what changes is that an allocation enters a new size-class, which uses a different algorithm for allocation. Or something along those lines. > > On Wednesday, July 28, 2021 at 11:44:13 AM UTC-4 Brian Candler wrote: > >> I think you have created rather a lot of threads recently on exactly the >> same topic: >> https://groups.google.com/g/golang-nuts/search?q=tapi%20benchmark >> >> I'm not convinced that another one is needed. There have been good >> answers in the previous threads. >> >> Go has a fairly complex runtime (as you'll see from the size of compiling >> "Hello world"), and such boundary conditions are to be expected, especially >> when looking at memory allocation. But these rarely matter in real-world >> programs. >> >> If they do matter in your application, then you may be happier with a >> language like C, where the machine-code generated maps more directly to the >> code you write. Even then, you will come across oddities in the >> microarchitectures of the underlying hardware, such as what happens when >> caches are under eviction pressure. >> >> When I was programming 6800's and 6502's, I was able to work out exactly >> how long a piece of code would take to run, by generating a cycle-by-cycle >> count. That's not possible any more :-) >> >> On Wednesday, 28 July 2021 at 15:43:38 UTC+1 tapi...@gmail.com wrote: >> >>> >>> The benchmark code: https://play.golang.org/p/IqVnVa5x9qp >>> >>> When N == 16384, the benchmark result: >>> >>> Benchmark_Insert-4 134622 8032 ns/op 32768 >>> B/op 1 allocs/op >>> Benchmark_Insert2-4 132049 8201 ns/op 32768 >>> B/op 1 allocs/op >>> >>> When N == 16385, the benchmark result: >>> >>> Benchmark_Insert-4 118677 9374 ns/op 40960 >>> B/op 1 allocs/op >>> Benchmark_Insert2-4 136845 7744 ns/op 40960 >>> B/op 1 allocs/op >>> >> -- > 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/2c217862-84b7-4bff-a48a-06810848bcf4n%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/2c217862-84b7-4bff-a48a-06810848bcf4n%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/CAEkBMfEGj-B%3DA0ncSyoFOU6Wu9n9tj996zY-nB-ez92m_jxthQ%40mail.gmail.com.
