Awesome !! Thank you. Il giorno sabato 20 febbraio 2021 alle 19:59:37 UTC+1 DrGo ha scritto:
> Dear Lorenzo, > Here’s a link to an old but still relevant tutorial on benchmarking Go > programs > > https://dave.cheney.net/2013/06/30/how-to-write-benchmarks-in-go > > Happy benchmarking > > On Saturday, February 20, 2021 at 11:19:40 AM UTC-6 TiT8 wrote: > >> >> Thank you Volker. >> >> I want to say that I was not trying to benchmark the two version of Go >> (two weeks ago I had go1.15.8, now 1.16). At the beginning I was trying to >> do some linear algebra with Go as a free “alternative of Matlab”, so I >> noted the difference between the exe coming from the two versions. >> Now I have understand that this is not the way to measure the specific >> performance of my issue. I will learn more and also testing. >> >> Sorry for your time, but thank you very much for your fast help. >> Il giorno sabato 20 febbraio 2021 alle 17:31:24 UTC+1 Volker Dobler ha >> scritto: >> >>> (premature send, sorry) >>> >>> 4. Your matrix multiplication is just a few CPU instructions, it is hard >>> to measure something tiny reliable. So use larger matrixes. >>> 5. You are benchmarking also how fast you can format and output >>> the results to stdout. This might or might not be intentional but >>> probably is just wrong. >>> 6. There is no point in comparing Go 1.15 and Go 1.16 with >>> microbenchmarks >>> which do not properly measure what you think they do. Your code spends >>> far too much time in a lot of things. Come up with a _proper_ benchmark >>> based on testing.B and go test. Make sure this benchmark is stable. Make >>> sure this benchmarks really benchmarks what you are trying to measure. >>> Then redo the benchmarks 10 times and compare them doing proper >>> statistics. >>> >>> V. >>> >>> >>> On Saturday, 20 February 2021 at 15:48:32 UTC+1 TiT8 wrote: >>> >>>> Hello everyone, >>>> I'm Lorenzo and I'm not a computer scientist, I have used some "Matlab" >>>> and I am new with Go (surprisingly fast, simple and elegant). >>>> >>>> I'm trying to do some basic operation on matrix with the "Gonum" >>>> package using vectorization. I was curious about the speed of development >>>> and the performance (repeat... surprisingly for me!). So I've tried to do >>>> some measures: >>>> >>>> *package main* >>>> >>>> *import (* >>>> * "fmt"* >>>> * "time"* >>>> >>>> * "gonum.org/v1/gonum/mat <http://gonum.org/v1/gonum/mat>"* >>>> *)* >>>> >>>> *func main() {* >>>> * p := mat.NewDense(3, 3, nil)* >>>> * a := mat.NewDense(3, 3, []float64{* >>>> * 1, 2, 3, 1, 2, 3, 1, 2, 3,* >>>> * })* >>>> >>>> * start := time.Now()* >>>> >>>> * p.Mul(a, a) *// element-wise >>>> >>>> * fmt.Printf("%v\n", mat.Formatted(p, mat.Prefix(""), mat.Squeeze()))* >>>> * p.Add(a, a) * >>>> >>>> * fmt.Printf("%v\n", mat.Formatted(p, mat.Prefix(""), mat.Squeeze()))* >>>> * p.MulElem(a, a)* >>>> >>>> * fmt.Printf("%v\n", mat.Formatted(p, mat.Prefix(""), mat.Squeeze()))* >>>> >>>> * fmt.Println(time.Since(start))* >>>> *}* >>>> >>>> >>>> Well... when I run the "go run mat.go" command the result time is about >>>> 150 microseconds, but when I run "go build" and then execute the binary >>>> the >>>> result time is about 4 *milli*seconds. This happen when I use go1.16. >>>> >>>> When I use go1.15.8, on the same code, the exe is faster (about 120 >>>> microseconds) then the "go run mat.go" (about 180 microseconds). One order >>>> of magnitude faster than go1.16 exe (and basic Matlab). >>>> >>>> So: >>>> >>>> - am I in error with the code (sorry, it's all new for me)? If yes, >>>> where is my fault? >>>> - if the "benchmark" was correct, why go1.16 build executable is >>>> slower than go1.15.8 exe and "go run" command? >>>> - Is it my machine's fault or Gonum package or what? >>>> - Do you also have these values? >>>> >>>> >>>> My pc: HP ELITEBOOK 8560w Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz, >>>> 2201 Mhz, 4 Core(s), 8 Logical Processor(s) x64. >>>> I am on the *Windows Subsystem Linux 2. * >>>> >>>> >>>> *Sorry for my English, I hope you understand my issue, thank you for >>>> the attention* >>>> >>>> >>>> >>>> >>>> >>>> -- 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/b7b558d9-d14c-4ba7-bcb8-977015e01bfdn%40googlegroups.com.
