Re: pg 8.1.3, AIX, huge box, painfully slow.

Gavin Hamill <gdh@laterooms.com> writes:
> There's truss installed which seems to do the same as strace on
> Linux... and here's a wildly non-scientific  glance..  I watched the
> 'topas' output (top for AIX) , identified a PID that was doing a lot of
> work, then attached truss to that pid. In addition to lots of send
> (), recv() and lseek()s...

Those are good, they represent real work getting done.

> about once a minute I saw hundreds of calls
> to __semop() interspersed with _select(),

This is not good.  Did the semop storms coincide with visible slowdown?
(I'd assume so, but you didn't actually say...)

            regards, tom lane