How sync_file_range() really works
There is a relatively new and platform dependent flushing function called sync_file_range(). Some databases (not MySQL) use sync_file_range() internally. Recently I investigated stall issues caused by buffered write and sync_file_range(). I learned a lot during investigation but I don't think these behaviors are well known to the public. Here I summarize my understandings. Understanding difference
Tracing and Profiling - Yocto Project
Tracing and Profiling in Yocto Yocto bundles a number of tracing and profiling tools - this 'HOWTO' describes their basic usage and shows by example how to make use of them to examine application and system behavior. The tools presented are for the most part completely open-ended and have quite good and/or extensive documentation of their own which can be used to solve just about any problem you m
Ensuring data reaches disk [LWN.net]
Please consider subscribing to LWNSubscriptions are the lifeblood of LWN.net. If you appreciate this content and would like to see more of it, your subscription will help to ensure that LWN continues to thrive. Please visit this page to join up and keep LWN on the net. In a perfect world, there would be no operating system crashes, power outages or disk failures, and programmers wouldn't have to w
![Ensuring data reaches disk [LWN.net]](https://cdn-ak-scissors.b.st-hatena.com/image/square/6b330395eb6a3a4002d6aa19c1d6d71ad3930378/height=288;version=1;width=512/https%3A%2F%2Fstatic.lwn.net%2Fimages%2F2011%2Fjm-data-flow.png)
ãƒãƒƒãƒ•ã‚¡ã‚ャッシュã¨AIO（1）
プãƒã‚»ã‚¹ãŒãƒ–ãƒãƒƒã‚¯ã™ã‚‹è¦å› ã®ä¸€ã¤ã«ãƒ•ã‚¡ã‚¤ãƒ«I/OãŒã‚ã‚Šã¾ã™ã€‚ã“れをåŒæœŸI/Oã¨è¨€ã„ã¾ã™ãŒã€POSIXã§ã¯AIO（éžåŒæœŸ I/Oã€Asynchronous I/O）も定義ã—ã¦ãŠã‚Šã€I/Oä¸ã§ã‚‚プãƒã‚»ã‚¹ãŒãƒ–ãƒãƒƒã‚¯ã›ãšä»–ã®å‡¦ç†ã‚’進ã‚られるよã†ã«ãªã‚Šã¾ã™ã€‚ 本記事ã§ã¯ãƒãƒƒãƒ•ã‚¡ã‚ャッシュã‹ã‚‰ãƒ•ã‚¡ã‚¤ãƒ« I/Oを解説ã—ã€Linuxã®io_submit(2)を用ã„ãŸPOSIXæº–æ‹ ã®AIOライブラリを試作ã—ã¦ã¿ã¾ã™ã€‚ ファイルI/Oã¨ãƒãƒƒãƒ•ã‚¡ã‚ャッシュ io_submit(2)ã§ã¯Direct I/Oを用ã„ã¾ã™ãŒã€ãƒ©ã‚¤ãƒ–ラリã®è©¦ä½œã¸é€²ã‚€å‰ã«ã¾ãšãƒ•ã‚¡ã‚¤ãƒ«I/Oã®ãƒãƒƒãƒ•ã‚¡ï¼ˆãƒãƒƒãƒ•ã‚¡ã‚ャッシュ）ã«ã¤ã„ã¦æ•´ç†ã—ã¾ã™ã€‚実ã¯å˜ã«ãƒãƒƒãƒ•ã‚¡ã¨è¨€ã£ã¦ã—ã¾ã†ã¨èª¤è§£ã•ã‚Œã‚‹å ´é¢ãŒå¤šãã‚ã‚Šã€ä¾‹ãˆã°ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°å…¥é–€ä¸€èˆ¬ã¨ã—ã¦ãƒ•ã‚¡ã‚¤ãƒ«I/Oã‚’å–り上ã’ã‚‹éš›ã«ã¯ã€ CPUã®å‹•ä½œã¯é€Ÿã„。ディスクã®å‹•ä½œã¯é…ã„。 両者ã®é–“ã«é€Ÿåº¦å·®ã‚’ç·©å’Œã™ã‚‹ç·©è¡
1
ランã‚ング
ランã‚ング
ランã‚ング
リリースã€éšœå®³æƒ…å ±ãªã©ã®ã‚µãƒ¼ãƒ“スã®ãŠçŸ¥ã‚‰ã›
最新ã®äººæ°—エントリーã®é…ä¿¡
j次ã®ãƒ–ックマーク
kå‰ã®ãƒ–ックマーク
lã‚ã¨ã§èªã‚€
eコメント一覧を開ã
oページを開ã
Better Linux Disk Caching & Performance with vm.dirty_ratio
New community features for Google Chat and an update on Currents
{{#tags}}- {{label}}
{{/tags}}