Latest Linux Hardware Reviews, Open-Source News & Benchmarks 51 Minutes Ago - Free Software - Sovereign Tech Fund - Add A CommentGermany's Sovereign Tech Fund has been making sizable investments into various Linux desktop projects, the Rust-based Coreutils implementation, libmicrohttpd, PHP, a systemd bug bounty, and other prominent open-source software that could benefit from greater financial re
はじめに 会社で PB 級の Hadoop クラスタを運用していますが、ある日から Datanode の CPU system (Kernel 内での CPU 使用率) が高騰し、Job が遅延するという症状が発現しました。Hadoop で CPU system 高騰というと、 Transparent HugePage 設定が有名ですが、そちらについては既に特定し、対策済みでした。 THP と Hadoop に関係については下記 Blog が詳しいです。 Transparent Huge Pages and Hadoop Workloads 今回は THP ではなく、 "zone_reclaim_mode" の設定による性能劣化について、現象から原因特定に至るまでの経緯と、推奨する設定について解説します。 現象 観測された現象について簡単に箇条書きします。 CPU user が 5% 程度
Lately we've been seeing issues with zone reclaim mode on large memory multi processor NUMA linux systems. What's NUMA? It's just an acronym for Non-Uniform Memory Access. This means that some memory in your system is more expensive for a particular CPU to access than its "local" memory. You can see how much more distant the kernel considers the different zones by using the numactl command like
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