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proc: Caching type offsets

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Caches the mapping of type names to offset in debug_info to speed up
variable evaluation.

BEFORE:
	BenchmarkArray-4         	     100	  13'238'441 ns/op	   0.62 MB/s
	BenchmarkArrayPointer-4  	     200	  10'044'093 ns/op	   0.87 MB/s
	BenchmarkMap-4           	    1000	   1'332'530 ns/op	   0.77 MB/s
	BenchmarkGoroutinesInfo-4	      10	 114'677'462 ns/op
	BenchmarkLocalVariables-4	    2000	   1'223'975 ns/op
AFTER:
	BenchmarkArray-4         	     200	   9'925'686 ns/op	   0.83 MB/s
	BenchmarkArrayPointer-4  	     100	  11'143'930 ns/op	   0.78 MB/s
	BenchmarkMap-4           	    2000	   1'302'520 ns/op	   0.79 MB/s
	BenchmarkGoroutinesInfo-4	      30	  35'079'549 ns/op
	BenchmarkLocalVariables-4	    1000	   1'137'299 ns/op

Note in particular the speedup of BenchmarkGoroutinesInfo, since
proc.(*Variable).parseG is a function we call a lot.
This commit is contained in:
aarzilli
2016-03-05 13:04:11 +01:00
parent 758f76ffee
commit c66c6408a5
3 changed files with 31 additions and 20 deletions
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2
proc/proc_test.go
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@ -1626,7 +1626,7 @@ func TestPackageVariables(t *testing.T) {
func TestIssue149(t *testing.T) {
ver, _ := ParseVersionString(runtime.Version())
if ver.Major > 0 && !ver.AfterOrEqual(GoVersion{1, 7, 0, 0, 0}) {
if ver.Major > 0 && !ver.AfterOrEqual(GoVersion{1, 7, 0, 0, 0}) {
return
}
// setting breakpoint on break statement