Created
May 29, 2018 01:26
-
-
Save changreytang/b96b25d6826d6c03b577b35fc3844ca3 to your computer and use it in GitHub Desktop.
Memory Profiling for CGo
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package main | |
| /* | |
| #include "lib/lib.h" | |
| #include <stdlib.h> | |
| #cgo LDFLAGS: -L. -llib | |
| */ | |
| import "C" | |
| import ( | |
| "flag" | |
| "fmt" | |
| "github.com/emilymaier/cmemory" | |
| // "time" | |
| // "github.com/pkg/profile" | |
| // "math" | |
| // "os" | |
| // "runtime" | |
| "strconv" | |
| "unsafe" | |
| ) | |
| func main() { | |
| // CPU profiling by default | |
| // defer profile.Start(profile.MemProfile).Stop() | |
| cmemory.StartInstrumentation() | |
| flag.Parse() | |
| n := 10 | |
| if flag.NArg() > 0 { | |
| n, _ = strconv.Atoi(flag.Arg(0)) | |
| } | |
| N := C.int(n) | |
| u := (C.malloc(C.size_t(N) * C.size_t(unsafe.Sizeof(C.double(0))))) | |
| u_slice := (*[1<<30 - 1]C.double)(u)[:n:n] | |
| for i := 0; i < n; i++ { | |
| u_slice[i] = C.double(1.0) | |
| } | |
| v := (C.malloc(C.size_t(N) * C.size_t(unsafe.Sizeof(C.double(0))))) | |
| v_slice := (*[1<<30 - 1]C.double)(v)[:n:n] | |
| for i := 0; i < 10; i++ { | |
| C.eval_AtA_times_u(N, (*C.double)(u), (*C.double)(v)) | |
| C.eval_AtA_times_u(N, (*C.double)(v), (*C.double)(u)) | |
| } | |
| var vBv, vv float64 | |
| for i := 0; i < n; i++ { | |
| vBv += float64(u_slice[i]) * float64(v_slice[i]) | |
| vv += float64(v_slice[i]) * float64(v_slice[i]) | |
| } | |
| // fmt.Printf("%0.9f\n", math.Sqrt(vBv/vv)) | |
| stats := cmemory.MemoryAnalysis() | |
| fmt.Println(stats.TotalBytesAllocated) | |
| // var m runtime.MemStats | |
| // runtime.ReadMemStats(&m) | |
| // fmt.Println(m.TotalAlloc) | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment