Gentoo Archives: gentoo-dev

From: Richard Yao <ryao@g.o>
To: "gentoo-dev@l.g.o" <gentoo-dev@l.g.o>
Subject: [gentoo-dev] Evaluating a new malloc()
Date: Tue, 26 Feb 2013 13:34:10
1 The Blender project found some fairly remarkable discrepancies between
2 what their software actually used and what glibc's ptmalloc allocated:
6 Results such as these led Blender and others (e.g. Chrome/Chromium,
7 Firefox, Thunderbird) to bundle private versions of jemalloc. This
8 bundling situation violates our policy against bundled libraries. The
9 maintainers could just patch their software to link to libjemalloc.
10 However, it might make more sense to evaluate jemalloc as a
11 distribution-wide replacement for glibc's ptmalloc.
13 It appears that run the following commands on amd64 to see how jemalloc
14 works when used system-wide:
16 echo dev-libs/jemalloc ~amd64 >> /etc/portage/package.accept_keywords
17 emerge dev-libs/jemalloc
18 echo /usr/lib64/ >> /etc/
20 I did this on my system, verified that jemalloc was being loaded with
21 strace and rebooted. So far, sudo is broken and anything that is 32-bit
22 will have the loader print an error about the library not being
23 preloaded. On a related note, setuid binaries will obey
24 /etc/, even though they ignore LD_PRELOAD.
26 There is a chance that patching jemalloc directly into glibc would solve
27 the sudo issue, but I imagine that sudo is doing something strange,
28 which likely merits attention. For now, I am using su as a substitute
29 until I look into why sudo is broken.
31 Unless a significant issue is found in jemalloc itself, I do not see any
32 reason to continue using glibc's ptmalloc over jemalloc. As far as I
33 know, FreeBSD, NetBSD, Facebook and others are using jemalloc, so I
34 expect that no significant issues will be found. jemalloc will still
35 needs testing before we can consider it. Doing good tests is hard, so I
36 would like to crowd source ideas on the appropriate way to test a malloc
37 implementation from the list. My expectation is that people on the list
38 will collectively think of better ideas than I could on my own.
40 With that said, what do people think?


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Subject Author
Re: [gentoo-dev] Evaluating a new malloc() "Diego Elio Pettenò" <flameeyes@×××××××××.eu>
Re: [gentoo-dev] Evaluating a new malloc() Alexander Berntsen <alexander@××××××.net>
Re: [gentoo-dev] Evaluating a new malloc() Alec Warner <antarus@g.o>
Re: [gentoo-dev] Evaluating a new malloc() Mike Gilbert <floppym@g.o>
[gentoo-dev] Re: Evaluating a new malloc() Ryan Hill <dirtyepic@g.o>
Re: [gentoo-dev] Evaluating a new malloc() Sergei Trofimovich <slyfox@g.o>