MySQL Forums
Forum List  »  InnoDB

Re: Innodb bogs down on complicated query(ies)
Posted by: Marko Mäkelä
Date: June 15, 2006 02:13AM

Next time the CPU is pinned, you could fire up OProfile to collect samples of CPU_CLK_UNHALTED (or equivalent) events. This will slow down the system by a few percent, depending on the desired accuracy. After the load has eased, do "opcontrol --stop" and examine the logs, e.g., "opreport --global-percent" to view the executables and libraries consuming most CPU cycles and "opreport -l /path/to/executable_or_library" to view the bottleneck functions, provided that the executable or library has not been stripped of symbols.

I don't know if OProfile is safe to use in a production environment. I have used it occasionally to find performance bottlenecks, and it has worked well for me.

Good luck,

Marko Mäkelä
Innobase Oy/Oracle Corp.

Options: ReplyQuote


Subject
Views
Written By
Posted
Re: Innodb bogs down on complicated query(ies)
2143
June 15, 2006 02:13AM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.