From: shyouhei@ruby-lang.org
To: ruby-core@ruby-lang.org
Subject: [ruby-core:88406] [Ruby trunk Feature#14759] [PATCH] set M_ARENA_MAX for glibc malloc
Date: Fri, 10 Aug 2018 00:51:18 +0000 (UTC) [thread overview]
Message-ID: <redmine.journal-73458.20180810005117.44bce2c8d93c88dd@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-14759.20180515082552@ruby-lang.org
Issue #14759 has been updated by shyouhei (Shyouhei Urabe).
normalperson (Eric Wong) wrote:
> shyouhei@ruby-lang.org wrote:
> > One question: is it possible to cancel the effect of
> > M_ARENA_MAX ? Given @mame's corner case, it might be
> > desirable for a user (or sysadmin) to be able to choose the
> > behaviour between the proposed one and the status quo.
>
> Environment variable (MALLOC_ARENA_MAX) at startup (only),
> or they can use fiddle or C extension to call mallopt
> at anytime once a program is running.
Yes the question is, what exactly is the value of MALLOC_ARENA_MAX that a user should specify to let malloc behave as it works in 2.5 now?
----------------------------------------
Feature #14759: [PATCH] set M_ARENA_MAX for glibc malloc
https://bugs.ruby-lang.org/issues/14759#change-73458
* Author: normalperson (Eric Wong)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
----------------------------------------
Not everybody benefits from jemalloc and the extra download+install
time is not always worth it. Lets make the user experience for
glibc malloc users better, too.
Personally, I prefer using M_ARENA_MAX=1 (via MALLOC_ARENA_MAX
env) myself, but there is currently a performance penalty for
that.
gc.c (Init_GC): set M_ARENA_MAX=2 for glibc malloc
glibc malloc creates too many arenas and leads to fragmentation.
Given the existence of the GVL, clamping to two arenas seems
to be a reasonable trade-off for performance and memory usage.
Some users (including myself for several years, now) prefer only
one arena, now, so continue to respect users' wishes when
MALLOC_ARENA_MAX is set.
Thanks to Mike Perham for the reminder [ruby-core:86843]
This doesn't seem to conflict with jemalloc, so it should be safe
for all glibc-using systems.
---Files--------------------------------
0001-gc.c-Init_GC-set-M_ARENA_MAX-2-for-glibc-malloc.patch (1.46 KB)
--
https://bugs.ruby-lang.org/
next prev parent reply other threads:[~2018-08-10 0:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-14759.20180515082552@ruby-lang.org>
2018-05-15 8:25 ` [ruby-core:87035] [Ruby trunk Feature#14759] [PATCH] set M_ARENA_MAX for glibc malloc normalperson
2018-05-16 5:03 ` [ruby-core:87059] " dennisb55
2018-05-16 5:24 ` [ruby-core:87063] " Eric Wong
2018-05-19 3:04 ` [ruby-core:87187] " dennisb55
2018-05-19 14:03 ` [ruby-core:87193] " mame
2018-05-21 6:30 ` [ruby-core:87211] " Eric Wong
2018-05-20 17:58 ` [ruby-core:87199] " mperham
2018-05-21 5:19 ` [ruby-core:87209] " dennisb55
2018-08-01 0:20 ` [ruby-core:88240] " sam.saffron
2018-08-01 9:41 ` [ruby-core:88255] " Eric Wong
2018-08-01 9:57 ` [ruby-core:88258] " Eric Wong
2018-08-01 13:04 ` [ruby-core:88259] " eregontp
2018-08-01 19:18 ` [ruby-core:88262] " Eric Wong
2018-08-01 20:55 ` [ruby-core:88263] " eregontp
2018-08-08 6:10 ` [ruby-core:88343] " ko1
2018-08-08 6:27 ` [ruby-core:88344] " ko1
2018-08-09 11:35 ` [ruby-core:88394] " shyouhei
2018-08-09 17:43 ` [ruby-core:88402] " Eric Wong
2018-08-10 0:51 ` shyouhei [this message]
2018-08-10 1:42 ` [ruby-core:88409] " Eric Wong
2018-08-10 2:07 ` [ruby-core:88411] " shyouhei
2018-08-10 2:16 ` [ruby-core:88412] " Eric Wong
2018-08-10 5:37 ` [ruby-core:88418] " dennisb55
2019-03-15 6:54 ` [ruby-core:91844] " dennisb55
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