cmd/compilebench: add object file size to package benchmarks
Protected by flag -obj.
Sample relevant output from compilecmp using this commit.
name old obj-bytes new obj-bytes delta
Template 382k ± 0% 381k ± 0% -0.23% (p=0.002 n=6+6)
Unicode 203k ± 0% 203k ± 0% -0.00% (p=0.002 n=6+6)
GoTypes 1.18M ± 0% 1.17M ± 0% -0.08% (p=0.002 n=6+6)
Compiler 3.99M ± 0% 3.99M ± 0% -0.08% (p=0.002 n=6+6)
SSA 8.28M ± 0% 8.28M ± 0% -0.02% (p=0.002 n=6+6)
Flate 230k ± 0% 230k ± 0% -0.05% (p=0.002 n=6+6)
GoParser 287k ± 0% 287k ± 0% -0.16% (p=0.002 n=6+6)
Reflect 1.00M ± 0% 1.00M ± 0% -0.01% (p=0.002 n=6+6)
Tar 190k ± 0% 189k ± 0% -0.24% (p=0.002 n=6+6)
XML 416k ± 0% 415k ± 0% -0.16% (p=0.002 n=6+6)
name old export-bytes new export-bytes delta
Template 19.0k ± 0% 18.2k ± 0% -4.55% (p=0.002 n=6+6)
Unicode 4.45k ± 0% 4.44k ± 0% -0.11% (p=0.002 n=6+6)
GoTypes 29.7k ± 0% 28.8k ± 0% -3.12% (p=0.002 n=6+6)
Compiler 75.6k ± 0% 72.5k ± 0% -4.03% (p=0.002 n=6+6)
SSA 76.2k ± 0% 74.8k ± 0% -1.72% (p=0.002 n=6+6)
Flate 4.98k ± 0% 4.87k ± 0% -2.29% (p=0.002 n=6+6)
GoParser 8.81k ± 0% 8.34k ± 0% -5.30% (p=0.002 n=6+6)
Reflect 6.25k ± 0% 6.16k ± 0% -1.49% (p=0.002 n=6+6)
Tar 9.49k ± 0% 9.03k ± 0% -4.82% (p=0.002 n=6+6)
XML 16.0k ± 0% 15.4k ± 0% -4.03% (p=0.002 n=6+6)
Change-Id: I3f5e6ec022cb02ad6937f7859c573ca1edc39fb7
Reviewed-on: https://go-review.googlesource.com/41053
Reviewed-by: Robert Griesemer <gri@golang.org>
diff --git a/cmd/compilebench/main.go b/cmd/compilebench/main.go
index 8bb5387..6869db5 100644
--- a/cmd/compilebench/main.go
+++ b/cmd/compilebench/main.go
@@ -34,6 +34,9 @@
// -memprofilerate rate
// Set runtime.MemProfileRate during compilation.
//
+// -obj
+// Report object file statistics.
+//
// -run regexp
// Only run benchmarks with names matching regexp.
//
@@ -60,6 +63,7 @@
package main
import (
+ "bytes"
"flag"
"fmt"
"go/build"
@@ -84,6 +88,7 @@
var (
flagAlloc = flag.Bool("alloc", false, "report allocations")
+ flagObj = flag.Bool("obj", false, "report object file stats")
flagCompiler = flag.String("compile", "", "use `exe` as the cmd/compile binary")
flagCompilerFlags = flag.String("compileflags", "", "additional `flags` to pass to compile")
flagRun = flag.String("run", "", "run benchmarks matching `regexp`")
@@ -268,7 +273,7 @@
}
end := time.Now()
- var allocs, bytes int64
+ var allocs, allocbytes int64
if *flagAlloc || *flagMemprofile != "" {
out, err := ioutil.ReadFile(pkg.Dir + "/_compilebench_.memprof")
if err != nil {
@@ -285,7 +290,7 @@
}
switch f[1] {
case "TotalAlloc":
- bytes = val
+ allocbytes = val
case "Mallocs":
allocs = val
}
@@ -317,11 +322,25 @@
wallns := end.Sub(start).Nanoseconds()
userns := cmd.ProcessState.UserTime().Nanoseconds()
+ fmt.Printf("%s 1 %d ns/op %d user-ns/op", name, wallns, userns)
if *flagAlloc {
- fmt.Printf("%s 1 %d ns/op %d user-ns/op %d B/op %d allocs/op\n", name, wallns, userns, bytes, allocs)
- } else {
- fmt.Printf("%s 1 %d ns/op %d user-ns/op\n", name, wallns, userns)
+ fmt.Printf(" %d B/op %d allocs/op", allocbytes, allocs)
}
- os.Remove(pkg.Dir + "/_compilebench_.o")
+ opath := pkg.Dir + "/_compilebench_.o"
+ if *flagObj {
+ // TODO(josharian): object files are big; just read enough to find what we seek.
+ data, err := ioutil.ReadFile(opath)
+ if err != nil {
+ log.Print(err)
+ }
+ // Find start of export data.
+ i := bytes.Index(data, []byte("\n$$B\n")) + len("\n$$B\n")
+ // Count bytes to end of export data.
+ nexport := bytes.Index(data[i:], []byte("\n$$\n"))
+ fmt.Printf(" %d object-bytes %d export-bytes", len(data), nexport)
+ }
+ fmt.Println()
+
+ os.Remove(opath)
}
