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haya14busa authored
There were no allocations in regexp.Match for *non* onepass regex because m.matchcap length is reset to zero (ncap=0 for regexp.Match). But, as for onepass regex, m.matchcap length remains as it is even when ncap=0 and it leads needless allocations. benchmark old ns/op new ns/op delta BenchmarkMatch_onepass_regex/32-4 6465 4628 -28.41% BenchmarkMatch_onepass_regex/1K-4 208324 151558 -27.25% BenchmarkMatch_onepass_regex/32K-4 7230259 5834492 -19.30% BenchmarkMatch_onepass_regex/1M-4 234379810 166310682 -29.04% BenchmarkMatch_onepass_regex/32M-4 7903529363 4981119950 -36.98% benchmark old MB/s new MB/s speedup BenchmarkMatch_onepass_regex/32-4 4.95 6.91 1.40x BenchmarkMatch_onepass_regex/1K-4 4.92 6.76 1.37x BenchmarkMatch_onepass_regex/32K-4 4.53 5.62 1.24x BenchmarkMatch_onepass_regex/1M-4 4.47 6.30 1.41x BenchmarkMatch_onepass_regex/32M-4 4.25 6.74 1.59x benchmark old allocs new allocs delta BenchmarkMatch_onepass_regex/32-4 32 0 -100.00% BenchmarkMatch_onepass_regex/1K-4 1024 0 -100.00% BenchmarkMatch_onepass_regex/32K-4 32768 0 -100.00% BenchmarkMatch_onepass_regex/1M-4 1048576 0 -100.00% BenchmarkMatch_onepass_regex/32M-4 104559255 0 -100.00% benchmark old bytes new bytes delta BenchmarkMatch_onepass_regex/32-4 512 0 -100.00% BenchmarkMatch_onepass_regex/1K-4 16384 0 -100.00% BenchmarkMatch_onepass_regex/32K-4 524288 0 -100.00% BenchmarkMatch_onepass_regex/1M-4 16777216 0 -100.00% BenchmarkMatch_onepass_regex/32M-4 2019458128 0 -100.00% Fixes #19573 Change-Id: I033982d0003ebb0360bb40b92eb3941c781ec74d Reviewed-on: https://go-review.googlesource.com/38270 Run-TryBot: Michael Matloob <matloob@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
Brad Fitzpatrick <bradfitz@golang.org>
8a16d7d4
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| .. | ||
| syntax | ||
| testdata | ||
| all_test.go | ||
| backtrack.go | ||
| example_test.go | ||
| exec.go | ||
| exec2_test.go | ||
| exec_test.go | ||
| find_test.go | ||
| onepass.go | ||
| onepass_test.go | ||
| regexp.go |