From: dennisb55@... Date: 2018-05-16T05:14:17+00:00 Subject: [ruby-core:87061] [Ruby trunk Feature#14718] Use jemalloc by default? 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. ---------------------------------------- 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: ---------------------------------------- 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: