On 27/06/14 21:19, Andres Freund wrote:
> On 2014-06-27 14:28:20 +1200, Mark Kirkwood wrote:
>> My feeling is spinlock or similar, 'perf top' shows
>>
>> kernel find_busiest_group
>> kernel _raw_spin_lock
>>
>> as the top time users.
>
> Those don't tell that much by themselves, could you do a hierarchical
> profile? I.e. perf record -ga? That'll at least give the callers for
> kernel level stuff. For more information compile postgres with
> -fno-omit-frame-pointer.
>
Excellent suggestion, will do next week!
regards
Mark