389-devel-requ...@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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