Javier Kohen 7dbf9d43f5 regexp: use sync.Pool to cache regexp.machine objects ... Performance optimization for the internals of the Regexp type. This adds no features and has no user-visible impact beyond performance. Copy now shares the cache, so memory usage for programs that use Copy a lot should go down; Copy has effectively become a no-op. The before v. after benchmark results show a lot of noise from run to run, but there's a clear improvement to the Shared case and no detriment to the Copied case. BenchmarkMatchParallelShared-4 361 77.9 -78.42% BenchmarkMatchParallelCopied-4 70.3 72.2 +2.70% Macro benchmarks show that the lock contention in Regexp is gone, and my server is now able to scale linearly 2.5x times more than before (and I only stopped there because I ran out of CPU in my test machine). Fixes #24411 Change-Id: Ib33abff2802f27599f5d09084775e95b54e3e1d7 Reviewed-on: https://go-review.googlesource.com/101715 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>		2018-04-03 16:03:19 +00:00
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syntax	regexp/syntax: update perl script to preserve \s behavior	2018-03-29 22:31:57 +00:00
testdata
all_test.go	regexp: don't allocate when All methods find no matches	2018-02-13 18:44:40 +00:00
backtrack.go	regexp: make (*bitState).push inlinable	2017-09-25 19:34:26 +00:00
example_test.go	regexp: examples for Regexp.Expand and Regexp.ExpandString functions	2017-08-28 15:34:19 +00:00
exec2_test.go
exec_test.go	all: revert "all: prefer strings.IndexByte over strings.Index"	2017-10-05 23:19:10 +00:00
exec.go	all: unindent some if bodies by exiting early	2017-10-31 20:07:46 +00:00
find_test.go
onepass_test.go	regexp: reduce allocations at onePassCopy	2017-03-28 17:58:10 +00:00
onepass.go	all: use strings.Builder instead of bytes.Buffer where appropriate	2018-03-26 23:05:53 +00:00
regexp.go	regexp: use sync.Pool to cache regexp.machine objects	2018-04-03 16:03:19 +00:00