389-devel-request@lists.fedoraproject.org wrote:
> My next steps from here will be:
>
> * To add USDT probes to the logs and back_ldbm to get better, fine detail about what is causing the excessive latency.
> * these probes are also needed to resolve what appears to be a symbol resolution issue with systemtap when optimisations are enabled.
> * To add probes in other parts of the code base to get better visualisation about where and how long timings are taking through an operation.
> * To run a lock contention profile (I was unable to do this today due to bugs in systemtap)
> * To document the setup proceedures
> * Commit all these into a PR
> * Document some actionable improvements we can make to improve the server performance.
mutrace will give you a good audit of lock contention, and it's simple to use, takes no setup.
http://git.0pointer.net/mutrace.git/
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
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