Date: Thu, 06 May 1999 14:57:01 +0100 From: Stuart Henderson <stuart@eclipse.net.uk> To: Andrew McNaughton <andrew@squiz.co.nz> Cc: Andy Angrick <angrick@netdirect.net>, Graeme Tait <graeme@echidna.com>, freebsd-isp@FreeBSD.ORG Subject: Re: Apache Stress testing Message-ID: <37319FAD.F78F8766@eclipse.net.uk> References: <199905061247.AAA04038@aniwa.sky>
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> One query I have: if my file system keeps tabs on when > files were last accessed, does that mean that every file > opened requires a disk access, even if it is cached, or > does this mark the cached info as dirty so that it will > be written at a future time? Does anyone have any > experience with the effect on apache performance of > mounting the file system with the noatime flag? I haven't looked at that but this makes me think of something you might not know, I think I read it on Wired's Webmonkey section (general article about Apache 1.3 performance, there is a lot more than just this - I can't remember it all atm but it might be interesting/useful). Sorry I don't have the url handy :( From what I remember if you have "followsymlinks no" Apache has to look up all the parent directories of the document directory (/ /usr /usr/local /usr/local/www /usr/local/www/data and any others) to check they're not symlinks. Similarly if "allowoverride" is not set to anything other than "none" there is a similar lookup for .htaccess files. -hackers or maybe -questions would be a good place to ask about FS cache / noatime if nobody here knows. I reckon that unless you actually want the access time info someplace other than apache's log, you might as well save the extra fs writes ;) Stuart To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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