Issue #14718 has been updated by bluz71 (Dennis B).


mperham (Mike Perham) wrote:

> An alternative is to tune glibc by reducing the number of arenas. Call this on startup:
> 
>     #include "malloc.h"
>     mallopt(M_ARENA_MAX, 2)

I am not favourable to this.

Less arenas means greater contention & serialisation at the memory allocator level. Guilds will be a pathway to true concurrency for CRuby, the above setting will negate those benefits. This will create an undesirable bottleneck once Guilds become a reality.

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Feature #14718: Use jemalloc by default?
https://bugs.ruby-lang.org/issues/14718#change-72021

* Author: mperham (Mike Perham)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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I know Sam opened #9113 4 years ago to suggest this but I'm revisiting the topic to see if there's any movement here for Ruby 2.6 or 2.7.  I supply a major piece of Ruby infrastructure (Sidekiq) and I keep hearing over and over how Ruby is terrible with memory, a huge memory hog with their Rails apps.  My users switch to jemalloc and a miracle occurs: their memory usage drops massively.  Some data points:

https://twitter.com/brandonhilkert/status/987400365627801601
https://twitter.com/d_jones/status/989866391787335680
https://github.com/mperham/sidekiq/issues/3824#issuecomment-383072469

Redis moved to jemalloc many years ago and it solved all of their memory issues too.  Their conclusion: the glibc allocator "sucks really really hard". http://oldblog.antirez.com/post/everything-about-redis-24.html

This is a real pain point for the entire Rails community and would improve Ruby's reputation immensely if we can solve this problem.



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