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From: Carlo Arenas <carenas@gmail.com>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: "René Scharfe" <l.s.r@web.de>,
	git@vger.kernel.org, avarab@gmail.com, gitster@pobox.com,
	michal.kiedrowicz@gmail.com
Subject: Re: [RFC PATCH v5 0/3] grep: almost no more leaks, hopefully no crashes
Date: Fri, 9 Aug 2019 20:05:16 -0700
Message-ID: <CAPUEspjVMbjdgBrW3qS3jwbd2ZfqMinfgGiasEZGwyZB-1c+QA@mail.gmail.com> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.1908092325480.46@tvgsbejvaqbjf.bet>

On Fri, Aug 9, 2019 at 2:26 PM Johannes Schindelin
<Johannes.Schindelin@gmx.de> wrote:
>
> FWIW I am very much in favor of this approach.

FWIW this is (almost) exactly what I had in mind with my first reply,
except I wanted to make setting of the global context be conditioned
to having NED enabled to avoid possible performance issues in
environments were NED is not even usable.

in macOS (obviously testing without NED) the following is the output
of (a hacked version) of p7801 for maint (against chromium's
repository), with René's patch on top

Test                                       HEAD^               HEAD
--------------------------------------------------------------------------------------
7820.1: perl grep 'how.to'                 0.51(0.35+1.11)
0.48(0.33+1.16) -5.9%
7820.2: perl grep '^how to'                0.47(0.33+1.08)
0.45(0.34+1.11) -4.3%
7820.3: perl grep '[how] to'               0.49(0.40+1.11)
0.53(0.41+1.13) +8.2%
7820.4: perl grep '(e.t[^ ]*|v.ry) rare'   68.72(68.77+1.14)
72.10(72.15+1.20) +4.9%
7820.5: perl grep 'm(ú|u)lt.b(æ|y)te'      0.48(0.35+1.12)
0.50(0.40+1.23) +4.2%

and this is with my squashed[2] changed on top of that :

Test                                       HEAD^               HEAD
--------------------------------------------------------------------------------------
7820.1: perl grep 'how.to'                 0.48(0.36+1.16)
0.46(0.33+1.09) -4.2%
7820.2: perl grep '^how to'                0.45(0.34+1.12)
0.42(0.29+0.99) -6.7%
7820.3: perl grep '[how] to'               0.48(0.40+1.13)
0.52(0.43+1.16) +8.3%
7820.4: perl grep '(e.t[^ ]*|v.ry) rare'   69.12(69.10+1.07)
69.19(69.19+1.18) +0.1%
7820.5: perl grep 'm(ú|u)lt.b(æ|y)te'      0.49(0.38+1.17)
0.46(0.35+1.13) -6.1%

the degenerate case is not something we can't fix anyway, since it is
likely a locking issue inside PCRE2 (I see at most 1 CPU doing work),
and the numbers are noisy because of the other problems I mentioned
before (hardcoded to 8 threads, running in a laptop with low number of
cores), which is why testing for performance regressions in windows is
strongly encouraged, regardless

Carlo

[1] https://public-inbox.org/git/CAPUEspgH1v1zo7smzQWCV4rX9pKVKLV84gDSfCPdT7LffQxUWw@mail.gmail.com/
[2] https://public-inbox.org/git/20190810030315.7519-1-carenas@gmail.com/

  parent reply	other threads:[~2019-08-10  3:05 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-05 11:51 [PATCH 0/1] Fix a problem with PCRE2 and nedmalloc, found via Azure Pipelines Johannes Schindelin via GitGitGadget
2019-08-05 11:51 ` [PATCH 1/1] pcre2: allow overriding the system allocator Johannes Schindelin via GitGitGadget
2019-08-05 16:19   ` Carlo Arenas
2019-08-05 16:27     ` Carlo Arenas
2019-08-05 19:32       ` Johannes Schindelin
2019-08-05 19:26     ` Johannes Schindelin
2019-08-05 21:53     ` Junio C Hamano
2019-08-06  6:24       ` Carlo Arenas
2019-08-06  8:50       ` [PATCH 0/3] grep: no leaks (WIP) Carlo Marcelo Arenas Belón
2019-08-06  8:50         ` [PATCH 1/3] grep: make PCRE1 aware of custom allocator Carlo Marcelo Arenas Belón
2019-08-08 13:54           ` Johannes Schindelin
2019-08-08 15:19             ` Carlo Arenas
2019-08-06  8:50         ` [PATCH 2/3] grep: make PCRE2 " Carlo Marcelo Arenas Belón
2019-08-08 13:56           ` Johannes Schindelin
2019-08-08 14:32             ` Carlo Arenas
2019-08-06  8:50         ` [PATCH 3/3] grep: avoid leak of chartables in PCRE2 Carlo Marcelo Arenas Belón
2019-08-06 16:36         ` [RFC PATCH v3 0/3] grep: no leaks or crashes (windows testing needed) Carlo Marcelo Arenas Belón
2019-08-06 16:36           ` [RFC PATCH v3 1/3] grep: make PCRE1 aware of custom allocator Carlo Marcelo Arenas Belón
2019-08-06 16:36           ` [RFC PATCH v3 2/3] grep: make PCRE2 " Carlo Marcelo Arenas Belón
2019-08-07  5:38             ` René Scharfe
2019-08-07  9:49               ` Carlo Arenas
2019-08-07 13:02                 ` René Scharfe
2019-08-07 13:08                   ` [PATCH 1/2] nedmalloc: do assignments only after the declaration section René Scharfe
2019-08-07 13:09                   ` [PATCH 2/2] nedmalloc: avoid compiler warning about unused value René Scharfe
2019-08-08  2:35                   ` [RFC PATCH v3 2/3] grep: make PCRE2 aware of custom allocator Carlo Arenas
2019-08-08  7:07                     ` René Scharfe
2019-08-08 12:38                       ` Carlo Arenas
2019-08-08 14:29                         ` René Scharfe
2019-08-08 20:18                           ` Johannes Schindelin
2019-08-07 18:15                 ` Junio C Hamano
2019-08-06 16:36           ` [RFC PATCH v3 3/3] grep: avoid leak of chartables in PCRE2 Carlo Marcelo Arenas Belón
2019-08-06 16:48           ` [RFC PATCH v3 0/3] grep: no leaks or crashes (windows testing needed) Junio C Hamano
2019-08-07 21:39           ` [RFC PATCH v4 " Carlo Marcelo Arenas Belón
2019-08-07 21:39             ` [RFC PATCH v4 1/3] grep: make PCRE1 aware of custom allocator Carlo Marcelo Arenas Belón
2019-08-07 21:39             ` [RFC PATCH v4 2/3] grep: make PCRE2 " Carlo Marcelo Arenas Belón
2019-08-07 22:28               ` Junio C Hamano
2019-08-07 21:39             ` [RFC PATCH v4 3/3] grep: avoid leak of chartables in PCRE2 Carlo Marcelo Arenas Belón
2019-08-09  3:02             ` [RFC PATCH v5 0/3] grep: almost no more leaks, hopefully no crashes Carlo Marcelo Arenas Belón
2019-08-09  3:02               ` [RFC PATCH v5 1/3] grep: make PCRE1 aware of custom allocator Carlo Marcelo Arenas Belón
2019-08-09  3:02               ` [RFC PATCH v5 2/3] grep: make PCRE2 " Carlo Marcelo Arenas Belón
2019-08-27  9:07                 ` Johannes Schindelin
2019-08-27 11:51                   ` Carlo Arenas
2019-10-03  5:02                     ` Junio C Hamano
2019-10-03  8:08                       ` Johannes Schindelin
2019-10-03 11:17                         ` Carlo Arenas
2019-10-03 18:23                           ` Johannes Schindelin
2019-10-03 22:57                           ` Junio C Hamano
2019-08-09  3:02               ` [RFC PATCH v5 3/3] grep: avoid leak of chartables in PCRE2 Carlo Marcelo Arenas Belón
2019-08-09 11:24               ` [RFC PATCH v5 0/3] grep: almost no more leaks, hopefully no crashes Carlo Arenas
2019-08-09 17:01                 ` René Scharfe
2019-08-09 17:46                   ` Junio C Hamano
2019-08-09 21:26                   ` Johannes Schindelin
2019-08-10  3:03                     ` [PATCH] SQUASH Carlo Marcelo Arenas Belón
2019-08-10  7:57                       ` René Scharfe
2019-08-10  8:42                         ` Carlo Arenas
2019-08-10 19:47                           ` René Scharfe
2019-08-12  7:35                             ` Carlo Arenas
2019-08-12 12:14                               ` René Scharfe
2019-08-12 12:28                                 ` Carlo Arenas
2019-08-10 13:57                       ` Johannes Schindelin
2019-08-10  3:05                     ` Carlo Arenas [this message]
2019-08-10  7:56                       ` [RFC PATCH v5 0/3] grep: almost no more leaks, hopefully no crashes René Scharfe
2019-08-10 12:40                         ` Carlo Arenas
2019-08-10 21:16                           ` René Scharfe
2019-08-08 20:21           ` [RFC PATCH v3 0/3] grep: no leaks or crashes (windows testing needed) Johannes Schindelin
2019-08-09  6:52             ` Carlo Arenas
2019-08-09 21:13               ` Johannes Schindelin

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