Jemalloc 4.0 Brings Space & Speed Optimizations

[phoronix]

Phoronix: Jemalloc 4.0 Brings Space & Speed Optimizations

Jemalloc, the memory allocator that tries to avoid memory fragmentation while focusing on scalable concurrency,hed version 4.0 earlier this month...

http://www.phoronix.com/scan.php?page=news_item&px=Jemalloc-4.0-Released

[ssokolow]

From what I remember, Firefox and Rust both use an older version of Jemalloc and have getting themselves as unforked as possible as one of their less prioritized goals.

[johnp117]

Background information:

• Firefox still hasn't enabled jemalloc3 by default and they're working to let rust-code in gecko use the gecko allocator.
• Mike Hommey (glandium) is working on getting jemalloc4 to work with Firefox, but things as of a couple days ago don't look so good.
• Back to Rust: Recently, an RFC has been published and implemented, that enables a custom allocator to be specified at compile time and switches the default allocator for dynamic libraries and static libraries to using the system malloc instead of jemalloc

edit: jemalloc4 has landed in the tree and is most likely going to be enabled in the next nightly build:

https://hg.mozilla.org/mozilla-central/rev/8b380feae2ae

[_ck_]

HHVM has switched to Jemalloc 4.0

https://github.com/facebook/hhvm/commit/fdde97651a051ac5ef9d9687ab78a1a3327b36f3

They need all the help they can get now that PHP 7 is about to pass them, making people wonder why use a binary several times the size of PHP

(does PHP use jemalloc? can it benefit from being compiled with jemalloc support?)