我有一个仅用于登录用户的 MediaWiki 安装，它非常慢（每个请求大约持续 2.5 秒）我经历了我发现的所有缓存和优化步骤。我使用默认配置的 APC，因为我没有发现任何改进，所以我运行了 mediawiki 分析，但我并没有完全理解输出。
forceprofile 的输出如下所示。
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%
分析日志中的输出看起来：
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]
我不知道为什么我的 setup.php、loadbalancer 和 db 这么慢？有没有人建议提高这些东西的性能。
编辑：我改回没有缓存的配置，分析输出如下所示：
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]