cmd/compile: add compiler phase timing
Timings is a simple data structure that collects times of labeled
Start/Stop events describing timed phases, which later can be written
to a file.
Adjacent phases with common label prefix are automatically collected
in a group together with the accumulated phase time.
Timing data can be appended to a file in benchmark data format
using the new -bench flag:
$ go build -gcflags="-bench=/dev/stdout" -o /dev/null go/types
commit: devel +
8847c6b Mon Aug 15 17:51:53 2016 -0700
goos: darwin
goarch: amd64
BenchmarkCompile:go/types:fe:init 1 663292 ns/op 0.07 %
BenchmarkCompile:go/types:fe:loadsys 1
1337371 ns/op 0.14 %
BenchmarkCompile:go/types:fe:parse 1
47008869 ns/op 4.91 % 10824 lines 230254 lines/s
BenchmarkCompile:go/types:fe:typecheck:top1 1
2843343 ns/op 0.30 %
BenchmarkCompile:go/types:fe:typecheck:top2 1 447457 ns/op 0.05 %
BenchmarkCompile:go/types:fe:typecheck:func 1
15119595 ns/op 1.58 % 427 funcs 28241 funcs/s
BenchmarkCompile:go/types:fe:capturevars 1 56314 ns/op 0.01 %
BenchmarkCompile:go/types:fe:inlining 1
9805767 ns/op 1.02 %
BenchmarkCompile:go/types:fe:escapes 1
53598646 ns/op 5.60 %
BenchmarkCompile:go/types:fe:xclosures 1 199302 ns/op 0.02 %
BenchmarkCompile:go/types:fe:subtotal 1
131079956 ns/op 13.70 %
BenchmarkCompile:go/types:be:compilefuncs 1
692009428 ns/op 72.33 % 427 funcs 617 funcs/s
BenchmarkCompile:go/types:be:externaldcls 1 54591 ns/op 0.01 %
BenchmarkCompile:go/types:be:dumpobj 1
133478173 ns/op 13.95 %
BenchmarkCompile:go/types:be:subtotal 1
825542192 ns/op 86.29 %
BenchmarkCompile:go/types:unaccounted 1 106101 ns/op 0.01 %
BenchmarkCompile:go/types:total 1
956728249 ns/op 100.00 %
For #16169.
Change-Id: I93265fe0cb08e47cd413608d0824c5dd35ba7899
Reviewed-on: https://go-review.googlesource.com/24462
Reviewed-by: Matthew Dempsky <mdempsky@google.com>