From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS4713 221.184.0.0/13 X-Spam-Status: No, score=-2.7 required=3.0 tests=BAYES_00,FORGED_HOTMAIL_RCVD2, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_PASS shortcircuit=no autolearn=no autolearn_force=no version=3.4.0 Received: from neon.ruby-lang.org (neon.ruby-lang.org [221.186.184.75]) by dcvr.yhbt.net (Postfix) with ESMTP id 14A3C1F51C for ; Fri, 18 May 2018 03:19:39 +0000 (UTC) Received: from neon.ruby-lang.org (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id 430A6120B33; Fri, 18 May 2018 12:19:30 +0900 (JST) Received: from o1678948x4.outbound-mail.sendgrid.net (o1678948x4.outbound-mail.sendgrid.net [167.89.48.4]) by neon.ruby-lang.org (Postfix) with ESMTPS id 18C9D120B32 for ; Fri, 18 May 2018 12:19:24 +0900 (JST) Received: by filter0023p3iad2.sendgrid.net with SMTP id filter0023p3iad2-26106-5AFE463A-F 2018-05-18 03:19:22.474796686 +0000 UTC Received: from herokuapp.com (ec2-54-161-248-8.compute-1.amazonaws.com [54.161.248.8]) by ismtpd0007p1iad1.sendgrid.net (SG) with ESMTP id t7YDKspoSDCcBR-_wYrXbg Fri, 18 May 2018 03:19:22.388 +0000 (UTC) Date: Fri, 18 May 2018 03:19:22 +0000 (UTC) From: dennisb55@hotmail.com To: ruby-core@ruby-lang.org Message-ID: References: Mime-Version: 1.0 X-Redmine-MailingListIntegration-Message-Ids: 62518 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 14718 X-Redmine-Issue-Author: mperham X-Redmine-Sender: bluz71 X-Mailer: Redmine X-Redmine-Host: bugs.ruby-lang.org X-Redmine-Site: Ruby Issue Tracking System X-Auto-Response-Suppress: All Auto-Submitted: auto-generated X-SG-EID: ync6xU2WACa70kv/Ymy4QrNMhiuLXJG8OTL2vJD1yS4qnTPdkxNnkgAIJocmI8GbbvIonk2c2KrSsc W9LzkGY5mQ5EQyo6t2hzTra2/0JYmf4MfrOsTZ1qpY4XKc4XiwX2DJgfKNNm55ciz6YjG6b5LLUAO0 lq599hsbsNPNhyjX3W8tUoj0k4Opz/QTxYpx+2kTz3Uwv/rnmZGwCuHPpA== X-ML-Name: ruby-core X-Mail-Count: 87156 Subject: [ruby-core:87156] [Ruby trunk Feature#14718] Use jemalloc by default? X-BeenThere: ruby-core@ruby-lang.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Ruby developers List-Id: Ruby developers List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ruby-core-bounces@ruby-lang.org Sender: "ruby-core" Issue #14718 has been updated by bluz71 (Dennis B). As much as it is a code-smell I too now favour hard-coding `M_ARENA_MAX=2` directly in Ruby whilst the GVL is in effect. Once Guilds land in 2.7/2.8/3.0 (whenever) then `M_ARENA_MAX=2` absolutely should be revisited since it will indeed lead to concurrency contention (less arenas leads to higher malloc contention). But Guilds are not here now and `M_ARENA_MAX=2` is an effective strategy for a very real problem. ---------------------------------------- Feature #14718: Use jemalloc by default? https://bugs.ruby-lang.org/issues/14718#change-72146 * 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/