d713e8e806
Before this CL: $ go test -bench=CompressedZipGarbage -count=5 -run=NONE archive/zip BenchmarkCompressedZipGarbage-8 50 20677087 ns/op 42973 B/op 47 allocs/op BenchmarkCompressedZipGarbage-8 100 20584764 ns/op 24294 B/op 47 allocs/op BenchmarkCompressedZipGarbage-8 50 20859221 ns/op 42973 B/op 47 allocs/op BenchmarkCompressedZipGarbage-8 100 20901176 ns/op 24294 B/op 47 allocs/op BenchmarkCompressedZipGarbage-8 50 21282409 ns/op 42973 B/op 47 allocs/op The B/op number is effectively meaningless. There is a surprisingly large one-time cost that gets divided by the number of iterations that your machine can get through in a second. This CL discards the first run, which helps. It is not a panacea. Running with -benchtime=10s will allow the sync.Pool to be emptied, which brings the problem back. However, since there are more iterations to divide the cost through, it’s not quite as bad, and running with a high benchtime is rare. This CL changes the meaning of the B/op number, which is unfortunate, since it won’t have the same order of magnitude as previous Go versions. But it wasn’t really comparable before anyway, since it didn’t have any reliable meaning at all. After this CL: $ go test -bench=CompressedZipGarbage -count=5 -run=NONE archive/zip BenchmarkCompressedZipGarbage-8 100 20881890 ns/op 5616 B/op 47 allocs/op BenchmarkCompressedZipGarbage-8 50 20622757 ns/op 5616 B/op 47 allocs/op BenchmarkCompressedZipGarbage-8 50 20628193 ns/op 5616 B/op 47 allocs/op BenchmarkCompressedZipGarbage-8 100 20756612 ns/op 5616 B/op 47 allocs/op BenchmarkCompressedZipGarbage-8 100 20639774 ns/op 5616 B/op 47 allocs/op Change-Id: Iedee04f39328974c7fa272a6113d423e7ffce50f Reviewed-on: https://go-review.googlesource.com/22585 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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