> On 11 Dec 2019, at 02:20, Howard Chu <hyc@symas.com> wrote:
>
> 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/
Thanks, that's a good tip, I'll look into that too. Appreciate it,
>
> --
> -- 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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—
Sincerely,
William Brown
Senior Software Engineer, 389 Directory Server
SUSE Labs
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