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INTERPOLATE-related change made matching of large strings slower #6612

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p6rt opened this issue Oct 14, 2017 · 3 comments
Closed

INTERPOLATE-related change made matching of large strings slower #6612

p6rt opened this issue Oct 14, 2017 · 3 comments
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perf regression Issue did not exist previously

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p6rt commented Oct 14, 2017

Migrated from rt.perl.org#132294 (status was 'resolved')

Searchable as RT132294$
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p6rt commented Oct 14, 2017

From @AlexDaniel

Code​:
my $a = rx/aaaaaab/; 'a' x 999999 ~ 'b' ~~ /$a/; say now - INIT now

¦«2015.12»​:
5.21453528

¦«2016.06»​:
2.98116495

¦«2016.12»​:
4.7695178

¦«2017.06»​:
4.2054743

¦«f72be0f130cf»​:
3.93059297

Possible IRC discussion​: https://irclog.perlgeek.de/perl6-dev/2017-08-24#i_15066525

The time swings back and forth but there's a clear regression (from <3 seconds to >4).

Bisectable points at (2016-09-14) rakudo/rakudo@c3b044d

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p6rt commented Oct 15, 2017

From @MasterDuke17

As of rakudo/rakudo@317ae16c0e, it now takes 3.3s on my machine.

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p6rt commented Oct 15, 2017

@MasterDuke17 - Status changed from 'new' to 'resolved'

@p6rt p6rt closed this as completed Oct 15, 2017
@p6rt p6rt added perf regression Issue did not exist previously labels Jan 5, 2020
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