檢查程式的效能瓶頸

★ System-wide:
oprofile, strace -c
★ Perl:
Devel::NYTProf
★ Ruby:
ruby -r profile (or just NewRelic)
★ PHP:
Xdebug + KCachegrind -- but not in production
XHProf http://mirror.facebook.net/facebook/xhprof/

來源是Presentations Announcement: 2010 O’Reilly MySQL Conference & Expo
其中的Diagnosing-and-Fixing-MySQL-Performance-Problems這篇
還有其他不錯的簡報，不過時間不夠看不完阿~~~