{"id":1669,"date":"2006-09-22T19:23:39","date_gmt":"2006-09-23T02:23:39","guid":{"rendered":"http:\/\/www.andreaswacker.com\/blog\/2006\/09\/22\/driving-around-with-the-handbrake-firmly-engaged\/"},"modified":"2006-09-22T19:23:39","modified_gmt":"2006-09-23T02:23:39","slug":"driving-around-with-the-handbrake-firmly-engaged","status":"publish","type":"post","link":"https:\/\/www.andreaswacker.com\/blog\/2006\/09\/22\/driving-around-with-the-handbrake-firmly-engaged\/","title":{"rendered":"driving around with the handbrake firmly engaged"},"content":{"rendered":"<p>What do I know about computers? I mean, really. So I build this rather big machine, to read along a couple of million weblogs. Needs storage. Sure. I get a 3ware raid controller. Works like a charm btw. There are more blogs, there is more spam, nothing surprising or new. The machine start to have a load of a solid 95-100%. Well, linux can deal with that, and it can. Today I tune another server, and look at parameters. One of them is the scheduler that is used to do the actual IO. The default for my kernel was <code>anticipatory<\/code>. I changed that, so that<br \/>\n<code>cat \/sys\/block\/sda\/queue\/scheduler<\/code><\/p>\n<p>reads now<\/p>\n<p><code>noop anticipatory [deadline] cfq<\/code><\/p>\n<p>And, what a surprise, the IO load starts to decline and the CPU is idle for 10-15% again! Of course this makes only sense on a server with lots of IO and database activity. That poor machine had to do stupid things for years.<\/p>\n<p>As I said: what do I know about computers? Academic, yet interesting question would be how many CPU cycles are actually wasted on things like this, how many are needed?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What do I know about computers? I mean, really. So I build this rather big machine, to read along a couple of million weblogs. Needs storage. Sure. I get a 3ware raid controller. Works like a charm btw. There are more blogs, there is more spam, nothing surprising or new. The machine start to have [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,19],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>driving around with the handbrake firmly engaged - Andreas Wacker<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.andreaswacker.com\/blog\/2006\/09\/22\/driving-around-with-the-handbrake-firmly-engaged\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"driving around with the handbrake firmly engaged - Andreas Wacker\" \/>\n<meta property=\"og:description\" content=\"What do I know about computers? I mean, really. So I build this rather big machine, to read along a couple of million weblogs. Needs storage. Sure. I get a 3ware raid controller. Works like a charm btw. There are more blogs, there is more spam, nothing surprising or new. 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