Why you should not delete images on your memory card using your camera
We love it when our readers get in touch with us to share their stories. This article was contributed to DIYP by a member of our community. If you would like to contribute an article, please contact us here. As many of you know, I spent many years of my life as Director of Marketing at Lexar dealing with the ins and outs of the memory card business. And in all that time, I have never written a blo
Tuning Linux for MongoDB
In this post, we’ll discuss tuning Linux for MongoDB deployments. By far the most common operating system you’ll see MongoDB running on is Linux 2.6 and 3.x. Linux flavors such as CentOS and Debian do a fantastic job of being a stable, general-purpose operating system. Linux runs software on hardware ranging from tiny computers like the Raspberry Pi up to massive data center servers. To make this
一時ファイルã¨dentry cacheã¨ãƒ¡ãƒ¢ãƒª - blog.nomadscafe.jp
ã‚ã‚Šã¨é•·ã„é–“æ‚©ã‚“ã§ã„ãŸã‚“ã ã‘ã©ã€æœ€è¿‘解決ã—ãŸã®ã§ãƒ¡ãƒ¢ã€‚ サービスã§åˆ©ç”¨ã—ã¦ã„ã‚‹smalllightã®ç”»åƒå¤‰æ›ã‚µãƒ¼ãƒãŒã€ApacheãŒä½¿ã£ã¦ã„るメモリ以上ã®ãƒ¡ãƒ¢ãƒªã‚’使用ã—ã€Swapã—ãŸã‚Šãƒ¡ãƒ¢ãƒªæž¯æ¸‡ã§ã‚µãƒ¼ãƒãŒãƒ€ã‚¦ãƒ³ã™ã‚‹ãªã©ã®ã“ã¨ãŒä½•åº¦ã‹ã‚ã‚Šã¾ã—ãŸã€‚ ↑メモリã®å‹•ãã¯ã“ã‚“ãªæ„Ÿã˜ ã„ã‚ã„ã‚調ã¹ãŸçµæžœã€Œdentry cacheã€ãªã‚‹ã‚‚ã®ãŒãƒ¡ãƒ¢ãƒªå¤šãã‚’å ã‚ã¦ã„ã‚‹ã“ã¨ãŒã‚ã‹ã‚Šã¾ã—ãŸã€‚dentry cacheã¯ãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªã‚„ファイルåã¨inodeã¨ã‚’çµã³ã¤ã‘ã«ä½¿ã‚れるã‚ャッシュã§ã™ã€‚smalllightã§ã¯ç”»åƒã‚’変æ›ã™ã‚‹éš›ã«ä¸€æ™‚ファイルを作æˆã™ã‚‹ã®ã§ã€ãã®æƒ…å ±ãŒæ®‹ã‚‹ã‚ˆã†ã§ã™ã€‚ 手元ã§å†ç¾ã•ã›ã‚‹ 本番ã§ä½¿ã£ã¦ã„るサーãƒã¯CentOS5ç³»ã§ã™ãŒã€æ‰‹å…ƒã®Vagrant上ã®CentOS6(ファイルシステムã¯ext4)ã§ã€å†ç¾ã•ã›ã¦ã¿ã¾ã—ãŸã€‚ use Parallel::Prefork; use File::Tem
Why use ECC?
Jeff Atwood, perhaps the most widely read programming blogger, has a post that makes a case against using ECC memory. My read is that his major points are: Google didn't use ECC when they built their servers in 1999 Most RAM errors are hard errors and not soft errors RAM errors are rare because hardware has improved If ECC were actually important, it would be used everywhere and not just servers.
Padding is hard | Dave Cheney
Hmm, so some progress. We’ve managed to reduce the storage in the Go 1.5 64 bit case, but the others appear unchanged, especially Go 1.5’s 32 bit case. For the Go 1.5 64 bit case, the padding that we saw above is still there, but it has moved. Effectively what the compiler is seeing is this: type ProgInfo struct { Reguse uint64 // registers implicitly used by this instruction Regset uint64 // regi
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ã¯ã˜ã‚ã« linuxã®ãƒ¡ãƒ¢ãƒªåˆ©ç”¨å®¹é‡(空ã容é‡)ã®è€ƒãˆæ–¹ linuxã®ãƒ¡ãƒ¢ãƒªåˆ©ç”¨å®¹é‡/空ã容é‡ã®è¨ˆç®—方法 â– RHEL7 ã€freeコマンドã¨meminfoã®å›³è§£ã€‘ ã€è¨ˆç®—方法】 freeコマンド表示例 /proc/meminfo表示例 â– RHEL6 ã€freeコマンドã¨meminfoã®å›³è§£ã€‘ ã€è¨ˆç®—方法】 freeコマンド表示例 /proc/meminfo表示例 â– RHEL5ä»¥å‰ ã€freeコマンドã¨meminfoã®å›³è§£ã€‘ ã€è¨ˆç®—方法】 freeコマンド表示例 /proc/meminfo表示例 蛇足 ãã®1：無åページã¨ãƒ•ã‚¡ã‚¤ãƒ«ãƒšãƒ¼ã‚¸ ãã®ï¼’：図解ã®å†…容ã®ãƒ„ッコミ ãã®ï¼“：RHEL6ã®è¨ˆç®— ãã®ï¼”：Inactiveを空ãé ˜åŸŸã¨ã™ã‚‹ã“ã¨ã¯é–“é•ã„。 ã¯ã˜ã‚ã« linuxサーãƒã‚’利用ã™ã‚‹ä¸Šã§ä½•æ™‚ã‚‚é ã‚’æ‚©ã¾ã™ã‚‚ã®ã®ä¸€ã¤ãŒã€ãƒ¡ãƒ¢ãƒªåˆ©ç”¨çŠ¶æ³ã®è©•ä¾¡(メモリ利用率)ã§ã¯ãªã„ã§ã—ょã†ã‹ã€‚ç§ã‚‚æ‚©ã¿ã¾ã™ã€‚ãã“ã§
Reducing Memory Access Latency
Satoru Moriya <satoru.moriya.br@hitachi.com> Linux Technology Center Yokohama Research Lab. Hitachi, Ltd Copyright (c) 2013 Hitachi LTD., Systems Development Lab. All right reserved Reducing Memory Access Latency Copyright (c) 2013 Hitachi LTD., Systems Development Lab. All right reserved 2 Contents 1. Introduction 2. Issues 3. solution Copyright (c) 2013 Hitachi LTD., Systems Development Lab. All
cachectld〜無駄ãªãƒšãƒ¼ã‚¸ã‚ャッシュã®å‰Šé™¤ã‚’自動化〜 | メルカリエンジニアリング
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Javaトラブルã«å‚™ãˆã‚ˆã† #jjug_ccc #ccc_h2
1. ã€JJUG CCC 2014 Spring H-Ââ€2】 Javaトラブルã«å‚™ãˆã‚ˆã† 日本Javaユーザグループ 上妻 宜人 (ã‚ã’ã¤ã¾ ã®ã‚Šã¨) ã¯ã¦ãªãƒ–ãƒã‚° : n-agetsuma.hatenablog.com 2. 自己紹介 上妻 宜人 (ã‚ã’ã¤ã¾ ã®ã‚Šã¨) nï®â€¯ 電話ã®è£å´ã‚’作ã£ã¦ã„る会社ã§åƒã„ã¦ã„ã¾ã™ nï®â€¯ Java/APサーãƒã®ç¤¾å†…技術サãƒãƒ¼ãƒˆã€ãƒˆãƒ©ãƒ–ãƒ«è§£æž nï®â€¯ Blog 『見習ã„プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°æ—¥è¨˜ã€ ã€JJUG CCC 2014 Spring H-Ââ€2】
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
/proc/meminfoを考ãˆã‚‹ - ã‚ã‚‚ã‚ã‚‚
通りã™ãŒã‚Šã®è²´æ–¹ãƒ»ãƒ»ãƒ»ãƒ» /proc/meminfoã®ã‚ã£ã¡ã®å€¤ã¨ã“ã£ã¡ã®å€¤ã‚’足ã—ãŸã‚‰ã€ãªã‚“ã§ãã£ã¡ã®å€¤ã¨åŒã˜ã«ãªã‚‰ãªã„ã®ãƒ»ãƒ»ãƒ»ãƒ» ã¨æ‚©ã‚“ã ã“ã¨ã‚ã‚Šã¾ã™ã‚ˆã？ /proc/meminfoã¯ã€ã‚«ãƒ¼ãƒãƒ«ãŒå†…部的ã«ç®¡ç†ã—ã¦ã„ã‚‹æž çµ„ã¿ã§ã®ãƒ¡ãƒ¢ãƒªæƒ…å ±ã‚’ãã®ã¾ã¾å‡ºã—ã¦ã„ã‚‹ã®ã§ã€æ®‹å¿µãªãŒã‚‰ãƒ¦ãƒ¼ã‚¶è¦–点ã§çŸ¥ã‚ŠãŸã„ãƒ¡ãƒ¢ãƒªæƒ…å ±ã¨ã¯ä¸€è‡´ã—ã¾ã›ã‚“。 ã¨ã¯ã„ãˆã€å¤‰ãªè§£é‡ˆã‚’ã—ã¦ç„¡æ„味ã«æ‚©ã¾ãªã„ãŸã‚ã«ã€ãã‚Œãžã‚Œã®å€¤ã®æ„味åˆã„ã¨é …目間ã®é–¢ä¿‚を知ã£ã¦ãŠãã®ã¯æœ‰æ„義ã§ã™ã€‚ç§ã®ç†è§£ã®ç¯„囲ã§ã€ãれらã®é–¢ä¿‚ã‚’ã¾ã¨ã‚ã¦ã„ãã¾ã™ã€‚ ＃ç§ã®ç†è§£ã‚‚完璧ã§ã¯ãªã„ã®ã§ã€é–“é•ã„ã‚ã‚Œã°ã‚„ã•ã—ãã”指摘ãŠé¡˜ã„ã—ã¾ã™ã€‚ å‚考資料　http://mkosaki.blog46.fc2.com/blog-entry-1007.html 2011/09/07 追記： tmpfsãŒSwapCachedã«å«ã¾ã‚Œã‚‹ã®ã¯å¹»æƒ³ã§ã—ãŸã€‚tmpfs=Shmemã«ä¿®æ£ã—ã¾ã—ãŸã€‚
Linux Check Memory Usage Using the CLI and GUI
Linux check memory usage using /proc/meminfo file The /proc/meminfo file stores statistics about memory usage on the Linux based system. The same file is used by free and other utilities to report the amount of free and used memory (both physical and swap) on the system as well as the shared memory and buffers used by the kernel. Examples Use the cat command or grep command to see /proc/meminfo fi
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Golang UK Conference 2015 - Dean Elbaz - Understanding Memory Allocation in Go
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Better active/inactive list balancing [LWN.net]
IBM Developer
Google Code Archive - Long-term storage for Google Code Project Hosting.
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