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


@mperham,

Noah Gibbs has a Discourse based benchmark that could be useful here in regards to producing a test-case to highlight memory fragmentation and utilisation.

He has already benchmarked the raw speed of  tcmalloc & jemalloc vs glibc in [this post](http://engineering.appfolio.com/appfolio-engineering/2018/2/1/benchmarking-rubys-heap-malloc-tcmalloc-jemalloc). Side note, jemalloc provides about a 10% speedup with these Discourse-based tests over glibc.

Now we need to run that same test but with memory utilisation metrics over an extended time-frame; many hours (not minutes).

Should we bring in Noah into this?

----------------------------------------
Feature #14718: Use jemalloc by default?
https://bugs.ruby-lang.org/issues/14718#change-72020

* Author: mperham (Mike Perham)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
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.



-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>