From: Gavin Hamill <gdh@laterooms.com>
To: pgsql-performance@postgresql.org
Subject: Re: pg 8.1.3, AIX, huge box, painfully slow.
Date: Fri, 7 Apr 2006 20:59:19 +0100
Message-ID: <20060407205919.a091da26.gdh@laterooms.com> (raw)
In-Reply-To: <1144436060.32269.13.camel@state.g2switchworks.com>
References: <20060407185823.abe93017.gdh@laterooms.com>
<1144436060.32269.13.camel@state.g2switchworks.com>
On Fri, 07 Apr 2006 13:54:21 -0500
Scott Marlowe <smarlowe@g2switchworks.com> wrote:
> Are the same queries getting the same basic execution plan on both
> boxes? Turn on logging for slow queries, and explain analyze them on
> both machines to see if they are.
See reply to Tom Lane :)
> I'd put the old 4 way Xeon back in production and do some serious
> testing of this pSeries machine. IBM should be willing to help you, I
> hope.
They probably would if this had been bought new - as it is, we have
rented the machine for a month from a 2nd-user dealer to see if it's
capable of taking the load. I'm now glad we did this.
> My guess is that this is an OS issue. Maybe there are AIX tweaks that
> will get it up to the same or higher level of performance as your four
> way xeon. Maybe there aren't.
The pSeries isn't much older than our Xeon machine, and I expected the
performance level to be exemplary out of the box.. we've enabled the
64-bit kernel+userspace, and compiled pg for 64-bitness with the gcc
flags as reccommended by Senica Cunningham on this very list..
> Myself, I'd throw a spare drive in for the OS, put some flavor of
> linux on it
Terrifying given I know nothing about the pSeries boot system, but at
this stage I'm game for nearly anything.
> http://www.asaservers.com/system_dept.asp?dept_id=SD-002
Multi-Opteron was the other thing we considered but decided to give
'Big Iron' UNIX a whirl...
Cheers,
Gavin.
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To: pgsql-performance@postgresql.org
Cc: gdh@laterooms.com
Subject: Re: pg 8.1.3, AIX, huge box, painfully slow.
In-Reply-To: <20060407205919.a091da26.gdh@laterooms.com>
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