From: dennisb55@... Date: 2019-03-15T06:50:06+00:00 Subject: [ruby-core:91843] [Ruby trunk Feature#14718] Use jemalloc by default? Issue #14718 has been updated by bluz71 (Dennis B). Outstanding research by Hongli Lai, and superbly presented in a post & video that all of us can easily digest. Sam's new [15667](https://bugs.ruby-lang.org/issues/15667) issue will be very interesting. I tend to agree, if all goes well, it should be a candidate for 2.5 & 2.6 back-ports. The results of that should also result in the closure of this issue and the [[PATCH] set M_ARENA_MAX for glibc malloc #14759](https://bugs.ruby-lang.org/issues/14759) issue. Thank you Hongli (if you are reading this). ---------------------------------------- Feature #14718: Use jemalloc by default? https://bugs.ruby-lang.org/issues/14718#change-77111 * 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. ---Files-------------------------------- glibc_arena_2.png (7.23 KB) jemalloc.png (21.1 KB) glibc-arena-2.log (60.3 KB) glibc.log (62.3 KB) jemalloc-3-5.log (58.5 KB) glibc.png (9.03 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: