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regexp: make Regexp.Find* allocation free #15643

valyala opened this issue May 11, 2016 · 0 comments

regexp: make Regexp.Find* allocation free #15643

valyala opened this issue May 11, 2016 · 0 comments


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@valyala valyala commented May 11, 2016

Currently Regexp.Find and Regexp.FindString allocates memory. This allocation may be easily removed - see the CL. Allocation-free Regexp.Find* functions work a bit faster comparing to the current implementation:

name          old time/op    new time/op    delta
Find-4           345ns ± 0%     313ns ± 1%    -9.13%    (p=0.000 n=9+9)
FindString-4     338ns ± 1%     312ns ± 0%    -7.88%   (p=0.000 n=10+9)

name          old alloc/op   new alloc/op   delta
Find-4           16.0B ± 0%     0.0B ±NaN%  -100.00%  (p=0.000 n=10+10)
FindString-4     16.0B ± 0%     0.0B ±NaN%  -100.00%  (p=0.000 n=10+10)

name          old allocs/op  new allocs/op  delta
Find-4            1.00 ± 0%     0.00 ±NaN%  -100.00%  (p=0.000 n=10+10)
FindString-4      1.00 ± 0%     0.00 ±NaN%  -100.00%  (p=0.000 n=10+10)
@bradfitz bradfitz added this to the Go1.8 milestone May 11, 2016
@gopherbot gopherbot closed this in bea39e6 Sep 6, 2016
@golang golang locked and limited conversation to collaborators Sep 6, 2017
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