Getting to Go: The Journey of Go's Garbage Collector - The Go Programming LanguageTips for writing clear, performant, and idiomatic Go code
Introducing Cloud Memorystore: A fully managed in-memory data store service for Redis | Google Cloud Blog
Introducing Cloud Memorystore: A fully managed in-memory data store service for Redis At Redisconf 2018 in San Francisco last month, we announced the public beta of Cloud Memorystore for Redis, a fully-managed in-memory data store service. Today, the public beta is available for everyone to try. Cloud Memorystore provides a scalable, more secure and highly available Redis service fully managed by
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今回もå‰å›žã®è¨˜äº‹ã«ã¤ã¥ãã€Java8ã«ã‚ˆã‚‹å¤‰æ›´ç‚¹ã§æœªã ã‚ã¾ã‚Šç´¹ä»‹ã•ã‚Œã¦ã„ãªã„ãƒã‚¤ãƒ³ãƒˆã‚’記事ã«ã—よã†ã¨æ€ã†ã€‚ 今回ã¯Java8ã®HotSpotVMã®è©±ã€‚Java8ã§ã¯JEP122ãŒå–ã‚Šè¾¼ã¾ã‚Œã€VMã®ãƒ¡ãƒ¢ãƒªãƒ¢ãƒ‡ãƒ«ãŒå¤‰æ›´ã•ã‚ŒãŸã€‚JEP122ã®ã‚¿ã‚¤ãƒˆãƒ«ã€ŒRemove the Permanent Generationã€ã‹ã‚‰æƒ³åƒã§ãã‚‹ã¨ãŠã‚Šã€Java8ã®HotSpotVMã‹ã‚‰ã¯å¾“æ¥ã®Permanenté ˜åŸŸãŒç„¡ããªã£ãŸã€‚ ãªãœã€ã“ã†ã„ã£ãŸå¤‰æ›´ãŒè¡Œã‚ã‚ŒãŸã®ã ã‚ã†ã‹ï¼Ÿã¾ãŸã€å…ƒã€…Permanenté ˜åŸŸã«æ ¼ç´ã•ã‚Œã¦ã„ãŸæƒ…å ±ã¯ä½•å‡¦ã«ã„ã£ã¦ã—ã¾ã£ãŸã®ã‹ï¼ŸJVM付属ã®ãƒ„ールã«ã©ã†ã„ã£ãŸå½±éŸ¿ãŒã‚ã‚‹ã®ã‹ï¼Ÿ 今回ã®è¨˜äº‹ã§ã¯ã“ã®ç‚¹ã‚’ã¾ã¨ã‚ã¦ã„ã“ã†ã¨æ€ã†ã€‚ ãªãŠã€HotSpotVMã®ãƒ¡ãƒ¢ãƒªãƒ¢ãƒ‡ãƒ«ã«ã¤ã„ã¦è©³ã—ããªã„æ–¹ã¯ã€å…ˆã«ã“ã¡ã‚‰ã®é …番（「補足 – HotSpotVMã®ãƒ¡ãƒ¢ãƒªæ§‹é€ 概説）をèªã‚“ã§ã„ãŸã ãã¨ã‚¹ãƒ ーズã«èªã¿é€²ã‚られるã
Close Encounters of The Java Memory Model Kind
Thanks to Gleb Smirnov, Vladimir Sitnikov, Alex Blewitt, Pavel Rappo, Doug Lea, Brian Goetz, Rory Hunter, Rafael Winterhalter, Paul Sandoz, Andrey Ershov and others for reviews, edits and helpful suggestions! Two years ago I painfully researched and built JMM Pragmatics talk and transcript, hoping it would highlight the particular dark corners of the Java Memory Models for those who cannot afford
Linux ã®ãƒ¡ãƒ¢ãƒªãƒ¼ç®¡ç†(メモリ―ãŒè¶³ã‚Šãªã„？,メモリーリークã®æ¤œå‡º-防æ¢)(Kodama's tips page)
サ−ãƒç‰ã«ä½¿ã£ã¦ã„ã‚‹PC ã®ãƒ¡ãƒ¢ãƒªãŒå分ã‹ã©ã†ã‹æ°—ã«ãªã‚‹äº‹ã¯å¤šã„ã¨æ€ã†. 調ã¹å‡ºã™ã¨ フリーメモリーã®ä¸è¶³ã‚„ SWAP ã«ãƒ¡ãƒ¢ãƒªãƒ¼ãŒã¯ã¿ã ã—ã¦ã„る様åãªã© 心é…ãªäº‹ãŒã„ã‚ã„ã‚ã§ã¦æ¥ã‚‹. PC ã®å‹•ä½œãŒé…ããªã‚‹åŽŸå› ã¯æ§˜ã€…ãªè¦å› ãŒçµ¡ã¿åˆã£ã¦ã„ã‚‹ã®ã§, 表é¢ã«ç¾ã‚ŒãŸç—‡çŠ¶ã ã‘ã§ã¯åŠ¹æžœçš„ãªå¯¾ç–ãŒåˆ†ã‹ã‚‰ãªã„事もã‚ã‚‹. 以下ã§ã¯, メモリ−関連ã«ã—ã¼ã£ã¦è§£èª¬ã™ã‚‹. メモリã®çŠ¶æ³ã‚’調ã¹ã‚‹ メモリ−ã¯å分ãªã¯ãšãªã®ã« 余裕ãŒç„¡ã„？ ã©ã®ãƒ—ãƒã‚»ã‚¹ãŒãƒ¡ãƒ¢ãƒªã‚’消費ã—ã¦ã„ã‚‹ã®ã‹ï¼Ÿ メモリーã®ãƒªãƒ¼ã‚¯ã‚’検出ã™ã‚‹æ–¹æ³•ï¼Ÿ 防æ¢ã™ã‚‹æ–¹æ³•ï¼Ÿ メモリ−ã¯å分ãªã¯ãšãªã®ã« SWAP を使ã£ã¦ã‚‹ï¼Ÿ ã˜ã‚ƒ, 本当ã®ãƒ¡ãƒ¢ãƒªâˆ’ä¸è¶³ã¯ã©ã†ã—ãŸã‚‰åˆ†ã‹ã‚‹ã®ï¼Ÿ メモリー㨠SWAP é ˜åŸŸã¯ã©ã®ãらã„確ä¿ã™ã‚‹ã¨è‰¯ã„ã®ã‹ メモリã®çŠ¶æ³ã‚’調ã¹ã‚‹ メモリã®åˆ©ç”¨çŠ¶æ³ã‚’調ã¹ã‚‹æ–¹æ³•ã¯, free, top, ps, vmstat, /proc/meminfo
DMM inside
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Understanding Non-Uniform Memory Access/Architectures (NUMA) - Jonathan Kehayias
Lately I have been doing a lot of work on SQL Server’s that have had 24 or more processor cores installed in them. Many of these systems utilize hardware non-uniform memory architectures, or NUMA, while a few of them were not. This led me into a good bit of additional research into the differences between the two configurations. In this blog post, we’ll look at what NUMA is, and why it matters, an
Node Interleaving: Enable or Disable? - frankdenneman.nl
frankdenneman Follow Frank Denneman is the Chief Technologist for AI at VMware by Broadcom. He is an author of the vSphere host and clustering deep dive series, as well as a podcast host for the Unexplored Territory podcast. You can follow him on Twitter @frankdenneman There seems to be a lot of confusion about this BIOS setting, I receive lots of questions on whether to enable or disable Node int
Transactional memory - Wikipedia
In computer science and engineering, transactional memory attempts to simplify concurrent programming by allowing a group of load and store instructions to execute in an atomic way. It is a concurrency control mechanism analogous to database transactions for controlling access to shared memory in concurrent computing. Transactional memory systems provide high-level abstraction as an alternative to
How to use, monitor, and disable transparent hugepages in Red Hat Enterprise Linux 6 ,7 and 8? - Red Hat Customer Portal
Environment Red Hat Enterprise Linux (RHEL) 6 Red Hat Enterprise Linux (RHEL) 7 Red Hat Enterprise Linux (RHEL) 8 Issue How do transparent hugepages work in RHEL 6? How are transparent hugepages activated by a process? Do we still need to preallocate some amount of memory for use as (transparent) hugepages? How can I see the number of transparent hugepages that are actually in use on the system (e
大容é‡ãƒ¡ãƒ¢ãƒªã«æ½œã‚€ãƒ¡ãƒ¢ãƒªæž¯æ¸‡å•é¡Œãã®ï¼‘ ～Linux HugePageã®è–¦ã‚～｜技術ブãƒã‚°ï½œãƒ¬ãƒƒã‚¯ãƒ»ãƒ†ã‚¯ãƒŽãƒã‚¸ãƒ¼ãƒ»ã‚³ãƒ³ã‚µãƒ«ãƒ†ã‚£ãƒ³ã‚°æ ªå¼ä¼šç¤¾
本稿を執ç†ã•ã›ã¦ã„ãŸã ãã¾ã™ã€ãƒ¬ãƒƒã‚¯ãƒ»ãƒ†ã‚¯ãƒŽãƒã‚¸ãƒ¼ãƒ»ã‚³ãƒ³ã‚µãƒ«ãƒ†ã‚£ãƒ³ã‚°ã®ç”°ä¸ã¨ç”³ã—ã¾ã™ã€‚ 本稿ã§ã¯Linux上ã§å‹•ä½œã™ã‚‹Oracleデータベース（以下ã€Oracle）ã®ãƒ¡ãƒ¢ãƒªã«é–¢ã™ã‚‹å†…容を記載ã—ã¦ã„ãã¾ã™ã€‚ ã•ã¦ã€ä»Šæ—¥Oracleã«å®Ÿè£…ã™ã‚‹ç‰©ç†ãƒ¡ãƒ¢ãƒªã¯ã€æ•°åGBを超ãˆã‚‹ã‚±ãƒ¼ã‚¹ã¯çã—ãã‚ã‚Šã¾ã›ã‚“。 ã“ã‚Œã«ä¼´ã„Oracleインスタンスã«å‰²ã‚Šå½“ã¦ã‚‹SGAï¼ˆå…±æœ‰ãƒ¡ãƒ¢ãƒªé ˜åŸŸï¼‰ã®ã‚µã‚¤ã‚ºã«ã¤ã„ã¦ã‚‚æ•°åGBã¨ã„ã£ãŸå·¨å¤§ãªé ˜åŸŸã‚’割り当ã¦ã‚‹ã‚±ãƒ¼ã‚¹ãŒå¤šã„ã®ã§ã¯ãªã„ã§ã—ょã†ã‹ã€‚ ã“ã‚Œã‹ã‚‰ä½•è©±ã‹ã«æ¸¡ã£ã¦ã€æ˜¨ä»Šã®æ•°åGBを超ãˆã‚‹ç‰©ç†ãƒ¡ãƒ¢ãƒªã‚’扱ã†éš›ã«é™¥ã‚Šã‚„ã™ã„メモリ枯渇ã®å•é¡Œã«ã¤ã„ã¦å–り上ã’ã¾ã™ã€‚ OracleãŒä½¿ç”¨ã™ã‚‹ãƒ¡ãƒ¢ãƒªé ˜åŸŸ Oracleã¯ä¸»ã«ä»¥ä¸‹ã®ãƒ¡ãƒ¢ãƒªé ˜åŸŸã‚’使用ã—ã¾ã™ã€‚ 環境ã«ã‚ˆã£ã¦è¨è¨ˆæ–¹é‡ã¯ç•°ãªã‚‹ã‹ã¨æ€ã„ã¾ã™ãŒã€Oracleã®ãƒ¡ãƒ¢ãƒªè¨è¨ˆã‚’è¡Œã†ä¸Šã§ã€ã“れらè¦ç´ ã®å€¤ã‚’的確ã«å°Žå‡ºã™ã‚‹ã“ã¨ãŒéžå¸¸ã«é‡è¦ã§ã™ã€‚ ・SGA
Linux ã®ãƒ¡ãƒ¢ãƒªã‚ャッシュをクリアã™ã‚‹ | futuremix
Linux ã® top コマンドや free コマンドã§è¡¨ç¤ºã•ã‚Œã‚‹ cached ã¯ã€å‹æ‰‹ã«ã©ã‚“ã©ã‚“増ãˆã¦ã„ãã¾ã™ã€‚free ãŒãªããªã‚‹ã¨ã“ã® cached ãŒå°‘ã—ãšã¤è§£æ”¾ã•ã‚Œã¦ä½¿ã‚ã‚Œã¾ã™ã€‚ cached ã‚‚ buffers も空ãメモリã®ä¸€éƒ¨ã§ã™ã®ã§ã€ã“れらãŒæºœã¾ã£ã¦ã„ã‚‹ã‹ã‚‰ã¨ã„ã£ã¦ç„¡ç†ã‚„り解放ã•ã›ã‚‹å¿…è¦ã¯é€šå¸¸ã¯ã‚ã‚Šã¾ã›ã‚“。cached を溜ã‚ã¦ã„ã‚‹ã®ã¯ãƒ‘フォーマンスã®ãŸã‚ãªã®ã§ã€è§£æ”¾ã•ã›ã‚‹ã¨é€šå¸¸ä½¿ç”¨æ™‚ã®ãƒ‘フォーマンスãŒè½ã¡ã¾ã™ã€‚逆ã«ã“れを解放ã—ã¦ãŠã‹ãªã„ã¨ã€ãƒ‘フォーマンスã®æ¸¬å®šãªã©ã§ã€æ£ã—ã„計測ãŒã§ãã¾ã›ã‚“。 kernel ã® 2.6.16 以é™ã§ã¯ã€è§£æ”¾ã‚’コマンドã‹ã‚‰è§£æ”¾ã§ãるよã†ã«ãªã‚Šã¾ã—ãŸã€‚root 㧠# echo 1 > /proc/sys/vm/drop_caches ã®ã‚ˆã†ã« /proc/sys/vm/drop_caches ã«1～3ã®å€¤ã‚’書ãè¾¼ã¿ã¾ã™ã€‚値ã«ã‚ˆã£ã¦è§£æ”¾ã•ã‚Œ
Linux performance tuning tips for MySQL
All of Percona’s open-source software products, in one place, to download as much or as little as you need.
LinuxMM - linux-mm.org Wiki
Linux-mm.org is a wiki for documenting how memory management works and for coordinating new memory management development projects. Please help editing this wiki. Thank you. Documentation LinuxMMDocumentation contains information on how to tweak the Linux kernel memory management subsystem. LinuxMMInternals explains how some of the Linux kernel memory management works. Community To subscribe to th
Memory management in Linux
The document discusses Linux memory management, describing how physical memory is divided into page frames and virtual memory allows processes to have a virtual view of memory mapped to physical memory using page tables, and covers topics like memory overcommit, page cache, swap space, and tools for monitoring memory usage.Read less
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4 Linux Commands To View Page Faults Statistics
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