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I have a MediaWiki Installation for logged in users only which is very slow (about constantly 2.5 seconds per request) I went through all steps of caching and optimization i have found. I use APC with default configuration and since i have not found any improvements i ran the mediawiki profiling, but i don't fully unserstand the output.
The output from the forceprofile looks like the following.
100.00% 2.475774 1 - -total
90.51% 2.240709 1 - Setup.php
89.56% 2.217199 1 - Setup.php-session
88.85% 2.199760 163 - LoadBalancer::getConnection
88.64% 2.194557 163 - LoadBalancer::openConnection
88.43% 2.189371 2 - DatabaseMysql::open
88.38% 2.188186 2 - dbconnect-localhost
8.02% 0.198664 1 - MediaWiki::main
6.15% 0.152351 1 - MediaWiki::finalCleanup
5.25% 0.129948 1 - OutputPage::output
5.21% 0.128936 1 - Output-skin
5.20% 0.128861 1 - SkinTemplate::outputPage
3.28% 0.081173 186 - DatabaseBase::query
2.64% 0.065307 1 - SkinTemplate::outputPage-stuff5
1.99% 0.049177 4 - query: COMMIT
1.82% 0.044994 1 - MediaWiki::performRequest
1.67% 0.041237 1 - MediaWiki::performAction
1.66% 0.041093 1 - Article::view
1.56% 0.038637 108 - LocalisationCache::getSubitem-load
1.41% 0.034958 1 - SkinTemplate::outputPage-execute
1.09% 0.026959 1 - Skin::buildSidebar
1.04% 0.025770 41 - Linker::titleAttrib
rest below 1%
the output in the profiling log looks:
Profiling data
Name Calls Total Each % Mem
-total 1 2530.972 2530.972 100.000% 5801152 ( 2530.972 - 2530.972) [0]
Setup.php 1 2269.201 2269.201 89.657% 1230737 ( 2269.201 - 2269.201) [65]
Setup.php-session 1 2246.935 2246.935 88.778% 312683 ( 2246.935 - 2246.935) [26]
LoadBalancer::getConnection 166 2213.220 13.333 87.445% 292024 ( 0.005 - 1117.286) [178]
LoadBalancer::openConnection 166 2211.142 13.320 87.363% 286279 ( 0.001 - 1117.276) [12]
DatabaseMysql::open 2 2208.200 1104.100 87.247% 13050 ( 1092.796 - 1115.404) [10]
dbconnect-localhost 2 2207.259 1103.630 87.210% 12544 ( 1092.338 - 1114.922) [0]
MediaWiki::main 1 222.392 222.392 8.787% 2675660 ( 222.392 - 222.392) [1486]
MediaWiki::finalCleanup 1 134.699 134.699 5.322% 1284487 ( 134.699 - 134.699) [981]
DatabaseBase::query 202 117.272 0.581 4.633% 342809 ( 0.079 - 32.658) [206]
OutputPage::output 1 108.740 108.740 4.296% 1280174 ( 108.740 - 108.740) [956]
Output-skin 1 103.328 103.328 4.083% 1087262 ( 103.328 - 103.328) [953]
SkinTemplate::outputPage 1 103.267 103.267 4.080% 1131051 ( 103.267 - 103.267) [952]
query: COMMIT 7 87.476 12.497 3.456% 432 ( 6.541 - 32.651) [0]
MediaWiki::performRequest 1 85.917 85.917 3.395% 1272664 ( 85.917 - 85.917) [503]
MediaWiki::performAction 1 81.878 81.878 3.235% 1184620 ( 81.878 - 81.878) [483]
Article::view 1 59.397 59.397 2.347% 679673 ( 59.397 - 59.397) [258]
SkinTemplate::outputPage-stuff5 1 55.888 55.888 2.208% 456139 ( 55.888 - 55.888) [400]
LocalisationCache::getSubitem-load 107 28.478 0.266 1.125% 54868 ( 0.240 - 0.468) [428]
-overhead-total 1570 27.168 0.017 1.073% 1076064 ( 27.168 - 27.168) [1570]
SkinTemplate::outputPage-execute 1 26.111 26.111 1.032% 30494 ( 26.111 - 26.111) [398]
DeferredUpdates::doUpdates 1 25.015 25.015 0.988% 377 ( 25.015 - 25.015) [16]
Skin::buildSidebar 1 21.318 21.318 0.842% 81176 ( 21.318 - 21.318) [218]
ParserCache::get 1 19.755 19.755 0.781% 1585 ( 19.755 - 19.755) [22]
DynamicSidebar::modifySidebar 1 18.910 18.910 0.747% 69284 ( 18.910 - 18.910) [192]
Linker::titleAttrib 40 18.445 0.461 0.729% 76664 ( 0.041 - 1.041) [313]
CategoryViewer::getHTML 1 17.666 17.666 0.698% 244568 ( 17.666 - 17.666) [218]
query: SELECT lc_value FROM `wiki_lNn_cache` WHERE lc_lang = 'X' LIMIT N 129 15.079 0.117 0.596% 240757 ( 0.086 - 0.513) [2]
LocalisationCache::getItem-load 16 13.923 0.870 0.550% 272404 ( 0.259 - 5.256) [100]
SkinTemplate::outputPage-stuff4 1 11.899 11.899 0.470% 330753 ( 11.899 - 11.899) [62]
Setup.php-globals 1 11.758 11.758 0.465% 567318 ( 11.758 - 11.758) [24]
-overhead-internal 1570 11.512 0.007 0.455% 351680 ( 0.006 - 0.046) [0]
ResourceLoader::makeModuleResponse 2 11.067 5.533 0.437% 238877 ( 4.679 - 6.388) [36]
I don't know why my setup.php, loadbalancer and db are this slow? Has anyone advice to improve the Performance of these things.
edit: I changed back to configuration without caching and the profiling output looks like:
Profiling data
Name Calls Total Each % Mem
-total 1 2264.308 2264.308 100.000% 18818800 ( 2264.308 - 2264.308) [0]
LoadBalancer::getConnection 171 1914.577 11.196 84.555% 873694 ( 0.010 - 969.956) [183]
LoadBalancer::openConnection 171 1912.571 11.185 84.466% 863369 ( 0.002 - 969.939) [12]
DatabaseMysql::open 2 1904.139 952.070 84.094% 13043 ( 941.427 - 962.713) [10]
dbconnect-localhost 2 1903.117 951.559 84.049% 12576 ( 940.917 - 962.201) [0]
MediaWiki::main 1 1168.946 1168.946 51.625% 8339081 ( 1168.946 - 1168.946) [1546]
MediaWiki::performRequest 1 1052.551 1052.551 46.484% 4786767 ( 1052.551 - 1052.551) [728]
SpecialPageFactory::executePath 1 1047.566 1047.566 46.264% 4567696 ( 1047.566 - 1047.566) [717]
Setup.php 1 1045.216 1045.216 46.160% 7760889 ( 1045.216 - 1045.216) [55]
Special:Version 1 1044.117 1044.117 46.112% 4018885 ( 1044.117 - 1044.117) [716]
Setup.php-globals 1 1011.005 1011.005 44.650% 4713595 ( 1011.005 - 1011.005) [30]
LocalisationCache::getItem-load 15 990.768 66.051 43.756% 1424628 ( 0.265 - 979.699) [102]
MessageCache::load 1 943.255 943.255 41.658% 14271 ( 943.255 - 943.255) [14]
MessageCache::load-fromcache 1 942.883 942.883 41.641% 13740 ( 942.883 - 942.883) [13]
MediaWiki::finalCleanup 1 115.499 115.499 5.101% 3464276 ( 115.499 - 115.499) [816]
OutputPage::output 1 113.857 113.857 5.028% 3377273 ( 113.857 - 113.857) [809]
Output-skin 1 102.706 102.706 4.536% 2424168 ( 102.706 - 102.706) [806]
SkinTemplate::outputPage 1 102.656 102.656 4.534% 2464206 ( 102.656 - 102.656) [805]
SkinTemplate::outputPage-stuff5 1 58.550 58.550 2.586% 1731893 ( 58.550 - 58.550) [346]
773
From the profiling data you posted it's obvious that the culprit is DB connection open which is brutally slow, the queries themselves seem to be running fast enough. Why it is happening is an interesting question:
max_connections is too low and it's idling
while clients are desperately waiting in a line to be connected?
75
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