From: | Gavin Hamill <gdh(at)laterooms(dot)com> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: pg 8.1.3, AIX, huge box, painfully slow. |
Date: | 2006-04-08 01:26:12 |
Message-ID: | 20060408022612.f5918e25.gdh@laterooms.com |
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Lists: | pgsql-performance |
On Fri, 07 Apr 2006 15:56:52 -0700
"Luke Lonergan" <llonergan(at)greenplum(dot)com> wrote:
> Seems like you're hitting a very small target in RAM with these semop
> calls. I wonder what part of the code is doing this - Tom would know
> better how to trace it, but the equivalent of oprofile output would
> be nice.
I'm happy to test whatever I can, but I simply don't know enough AIX to
be able to tell whether a similar kernel-level profiler is
available/possible.
> The other thing that I'd like to see is an evaluation of the memory
> access latency of this machine from Register to RAM. I couldn't find
> a benchmarking tool that was UNIX friendly out there, maybe I'll
> write one real quick. I suspect this machine has a heinous latency
> and a storm of semops to the same spot of RAM might be a far worse
> performance problem on this machine than on others...
Well, as I said to Tom, the machine is available for running tests
on :) If it helps us, and helps pg become more AIX friendly, then I'm
all for whatever needs done...
Cheers,
Gavin.
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