On Thursday, March 2, 2023 at 2:03:22 AM UTC-5 Jochen Voss wrote: Hi Peter,
Thanks a lot, giving the "-alloc_space" option makes all the difference! With this option, it also works for me. I wonder whether it meant to be the way that you have to give this option. Maybe something broke? In the blog entry https://go.dev/blog/pprof they didn't need this option to get the profile output. The Go blog post at https://go.dev/blog/pprof was written in 2011; it is now 2023. For up-to-date information, see the latest pprof package documentation at https://pkg.go.dev/runtime/pprof@latest. The pprof package documentation is incorrect: To add equivalent [go test] profiling support to a standalone program, add code like the following to your main function: // ... runtime.GC() // get up-to-date statistics if err := pprof.WriteHeapProfile(f); err != nil { log.Fatal("could not write memory profile: ", err) } // ... To obtain equivalent results, replace the above code with: // ... runtime.GC() // get up-to-date statistics if allocs := pprof.Lookup("allocs"); allocs == nil { log.Fatal("could not lookup memory profile: ") } else if err := allocs.WriteTo(f, 0); err != nil { log.Fatal("could not write memory profile: ", err) } // ... For your example, yyy.go: https://go.dev/play/p/epy4c3et1Io $ go build yyy.go && ./yyy $ go tool pprof mem.prof File: yyy Type: alloc_space Time: Mar 2, 2023 at 10:02am (EST) Entering interactive mode (type "help" for commands, "o" for options) (pprof) top Showing nodes accounting for 6975.42MB, 98.93% of 7050.77MB total Dropped 62 nodes (cum <= 35.25MB) Showing top 10 nodes out of 18 flat flat% sum% cum cum% 3564.88MB 50.56% 50.56% 3564.88MB 50.56% golang.org/x/exp/slices.Insert[...] (inline) 3122.14MB 44.28% 94.84% 3122.14MB 44.28% seehuhn.de/go/layout.(*Skip).Minus 117.01MB 1.66% 96.50% 117.01MB 1.66% seehuhn.de/go/layout.(*Skip).Clone (inline) 115.51MB 1.64% 98.14% 6919.54MB 98.14% seehuhn.de/go/layout.(*knuthPlassLineBreaker).Run 52.89MB 0.75% 98.89% 65.63MB 0.93% compress/flate.NewWriter 2.50MB 0.035% 98.92% 6926.54MB 98.24% seehuhn.de/go/layout.(*Engine).EndParagraph 0.50MB 0.0071% 98.93% 7050.27MB 100% main.main 0 0% 98.93% 65.63MB 0.93% compress/flate.NewWriterDict 0 0% 98.93% 65.63MB 0.93% compress/zlib.(*Writer).Write 0 0% 98.93% 65.63MB 0.93% compress/zlib.(*Writer).writeHeader (pprof) quit $ Peter -- 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/01d529ad-4a05-470f-b9d8-802e308972dbn%40googlegroups.com.
