I've done a bit of digging and noticed that, contrary to what I wrote earlier, the CPU sometimes running at 100% for a while. I've asked for extra cores to see if that fixes anything.
> * try disabling all extensions just to elliminate faulty extension as a > cause. > I disabled all extensions, but could still provoke the behaviour quite easily. > * enable profiling (if possible. Probably requires installing xhprof) to > determine what mediawiki is spending all its time doing. This would be the > most useful thing to figure out what is going on. > I managed to get profiling working with Xdebug. Here's a screenshot from QCachegrind with a typical profiling file loaded: https://phabricator.wikimedia.org/F15270287. I'm not exactly what it means, other than it looks like most of the time is spent on something unknown. > * if using sqlite, switch to mariadb (sqlite has poor concurrency) > The wiki uses MySql, as per https://www.mediawiki.org/wiki/Manual:Installing_MediaWiki_on_Windows_Server_2016. Should we change anyway? > > > Some general performance tips: > * ensure that caching is enabled. On IIS you probably want to set up > XCache. Otherwise use apcu. Once apcu or xcache is set up, make sure > wgMainCacheType = CACHE_ACCEL; > WinCache is enabled (it was recommended here: https://www.mediawiki.org/wiki/PHP_configuration#Opcode_caching) and wgMainCacheType is set to CACHE_ACCEL; > *although windows is supported, mediawiki is definitely better tested on > linux. > *Sebastian Berlin* Utvecklare/*Developer* Wikimedia Sverige (WMSE) E-post/*E-Mail*: sebastian.ber...@wikimedia.se Telefon/*Phone*: (+46) 0707 - 92 03 84 On 8 March 2018 at 08:08, Sebastian Berlin <sebastian.ber...@wikimedia.se> wrote: > One Thing you havent provided is the web server being used? is it IIS? >> > Yes, it's IIS. > > Thanks for the tips, Brian. I'll look into those. > > *Sebastian Berlin* > Utvecklare/*Developer* > Wikimedia Sverige (WMSE) > > E-post/*E-Mail*: sebastian.ber...@wikimedia.se > Telefon/*Phone*: (+46) 0707 - 92 03 84 > > On 7 March 2018 at 20:59, Brian Wolff <bawo...@gmail.com> wrote: > >> Ok, so its hard to say just from this. Some general things that may or may >> not apply: >> >> * try disabling all extensions just to elliminate faulty extension as a >> cause. >> * enable profiling (if possible. Probably requires installing xhprof) to >> determine what mediawiki is spending all its time doing. This would be the >> most useful thing to figure out what is going on. >> * if using sqlite, switch to mariadb (sqlite has poor concurrency) >> >> >> Some general performance tips: >> * ensure that caching is enabled. On IIS you probably want to set up >> XCache. Otherwise use apcu. Once apcu or xcache is set up, make sure >> wgMainCacheType = CACHE_ACCEL; >> *although windows is supported, mediawiki is definitely better tested on >> linux. >> >> -- >> Brian >> >> On Wednesday, March 7, 2018, Sebastian Berlin < >> sebastian.ber...@wikimedia.se> >> wrote: >> > We're having issues with a MW installation that gets very slow when >> > multiple users are logged in simultaneously. After a while the wiki >> becomes >> > unresponsive and in some cases gives HTTP error 500. This has occurred >> with >> > as few as three users logged in at once. >> > >> > The wiki was installed on a Windows server 2016-server, following this >> > guide: >> > >> https://www.mediawiki.org/wiki/Manual:Installing_MediaWiki_ >> on_Windows_Server_2016 >> . >> > My first thought was that there was too little server resources, but >> when >> I >> > looked at the task manager, CPU was fairly consistently between 5 and >> 25% >> > (there were a few spikes) and the RAM was steady at around 50%. MW >> version >> > is 1.30.0. >> > >> > I have turned on logging (following these instructions: >> > https://www.mediawiki.org/wiki/Manual:How_to_debug#Logging), but I >> can't >> > find any obvious cause for this behaviour. I have compiled a list of >> > messages that looks suspicious here: >> https://phabricator.wikimedia.org/P6814. >> > I didn't want to post the whole log since the logging instructions had >> > security warnings about this. >> > >> > Any help with how to proceed finding the cause for this and fixing it >> would >> > be much appreciated. >> > >> > All the best, >> > >> > *Sebastian Berlin* >> > Utvecklare/*Developer* >> > Wikimedia Sverige (WMSE) >> > >> > E-post/*E-Mail*: sebastian.ber...@wikimedia.se >> > Telefon/*Phone*: (+46) 0707 - 92 03 84 >> > _______________________________________________ >> > MediaWiki-l mailing list >> > To unsubscribe, go to: >> > https://lists.wikimedia.org/mailman/listinfo/mediawiki-l >> > >> _______________________________________________ >> MediaWiki-l mailing list >> To unsubscribe, go to: >> https://lists.wikimedia.org/mailman/listinfo/mediawiki-l >> > > _______________________________________________ MediaWiki-l mailing list To unsubscribe, go to: https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
