+1 for this discussion. While developing on a single 4-core 8GB EC2 with no http cache, no lucene, using apache and mysql, I notice that sometimes even when I'm the only user, the response from just a soft browser refresh (not CTRL-F5) it is very sluggish, but not sure if it's Amazon or not. Other times it's quite responsive.
________________________________ From: David Gerard <[email protected]> To: MediaWiki announcements and site admin list <[email protected]> Sent: Saturday, April 20, 2013 1:29 PM Subject: [MediaWiki-l] How to diagnose causes of site slowness? rationalwiki.org is currently serving pages very slowly. It's intermittent, but when it's slow it's a *slug*. Many users are getting 502 errors from Apache or 503 from the Squids. We have one Linode doing Apache/MySQL/Lucene. It's an 8GB box with 8 cores. (Was 4GB/4 cores, but Linode just doubled everyone's server.) In front of that are two Squids fed by a load balancer. * Sometimes the cause is obvious: when the load average is 30 and top shows a pile of Apaches using up CPU, then it's PHP handling a complex page request. (No, I still haven't made it PHP via fcgid.) * Sometimes it isn't, e.g. this afternoon when the site was running like a slug and load average was 0.8 with nothing amiss in top. * The squids don't show an unusual rate of hits on the site. * We have plenty of memory free - about 4GB on the main box is just sitting in file cache. * php_errors.log only shows up some processes timing out their 30 seconds (which would be the 502s). So where would I start looking to work out what's going on? - d. _______________________________________________ MediaWiki-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/mediawiki-l _______________________________________________ MediaWiki-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
