On 7/30/12 10:09 AM, Scott Marlowe wrote:
I think the zone_reclaim gets turned on with a high ratio. If the
inter node costs were the same, and the intranode costs dropped in
half, zone reclaim would likely get turned on at boot time.
We've been seeing a major problem with zone_reclaim and
On Fri, Aug 3, 2012 at 4:30 PM, Josh Berkus j...@agliodbs.com wrote:
On 7/30/12 10:09 AM, Scott Marlowe wrote:
I think the zone_reclaim gets turned on with a high ratio. If the
inter node costs were the same, and the intranode costs dropped in
half, zone reclaim would likely get turned on at
This is poor design on Linux's part, since even the distant RAM is
faster than disk. For now, we've been disabling zone_reclaim entirely.
I haven't run into this, but we were running ubuntu 10.04 LTS. What
kernel were you running when this happened? I'd love to see a test
case on this,
Greg Smith g...@2ndquadrant.com wrote:
You can tell if this is turned on like this:
echo /proc/sys/vm/zone_reclaim_mode
As a data point, the benchmarks I did for some of the 9.2
scalability features does not appear to have this turned on:
# cat /proc/sys/vm/zone_reclaim_mode
0
Our
On Mon, Jul 30, 2012 at 10:43 AM, Kevin Grittner
kevin.gritt...@wicourts.gov wrote:
node distances:
node 0 1 2 3
0: 10 11 11 11
1: 11 10 11 11
2: 11 11 10 11
3: 11 11 11 10
When considering a hardware purchase, it might be wise to pay close
attention to how
node distances:
node 0 1 2 3
0: 10 11 11 11
1: 11 10 11 11
2: 11 11 10 11
3: 11 11 11 10
When considering a hardware purchase, it might be wise to pay close
attention to how far a core may need to go to get to the most
distant RAM.
Yikes, my server
On Tue, Jul 17, 2012 at 09:52:11PM -0400, Greg Smith wrote:
I've taken to disabling /proc/sys/vm/zone_reclaim_mode on any Linux
system where it's turned on now. I'm still working through whether
it also makes sense in all cases to use the more complicated
On Tue, Jul 18, 2012 at 2:38 AM, Claudio Freire wrote:
It must have been said already, but I'll repeat it just in case:
I think postgres has an easy solution. Spawn the postmaster with
interleave, to allocate shared memory, and then switch to local on
the backends.
Do you have a suggestion
On Tue, Jul 24, 2012 at 3:36 PM, John Lister john.lis...@kickstone.com wrote:
Do you have a suggestion about how to do that? I'm running Ubuntu 12.04 and
PG 9.1, I've modified pg_ctlcluster to cause pg_ctl to use a wrapper script
which starts the postmaster using a numactl wrapper, but all
On Tue, Jul 24, 2012 at 3:41 PM, Claudio Freire klaussfre...@gmail.com wrote:
On Tue, Jul 24, 2012 at 3:36 PM, John Lister john.lis...@kickstone.com
wrote:
Do you have a suggestion about how to do that? I'm running Ubuntu 12.04 and
PG 9.1, I've modified pg_ctlcluster to cause pg_ctl to use a
On Tue, Jul 24, 2012 at 5:12 PM, Claudio Freire klaussfre...@gmail.com wrote:
Something like the attached patch (untested)
Sorry, on that patch, MPOL_INTERLEAVE should be MPOL_DEFAULT
--
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your
On 24/07/2012 21:12, Claudio Freire wrote:
On Tue, Jul 24, 2012 at 3:41 PM, Claudio Freire klaussfre...@gmail.com wrote:
On Tue, Jul 24, 2012 at 3:36 PM, John Lister john.lis...@kickstone.com wrote:
Do you have a suggestion about how to do that? I'm running Ubuntu 12.04 and
PG 9.1, I've
On Tue, Jul 24, 2012 at 6:23 PM, John Lister john.lis...@kickstone.com wrote:
Cheers, I'll give it a go, I wonder if this is likely to be integrated into
the main code? As has been mentioned here before, postgresql isn't as badly
affected as mysql for example, but I'm wondering if the trend to
My experience is that disabling swap and turning off zone_reclaim_mode
gets rid of any real problem for a large memory postgresql database
server. While it would be great to have a NUMA aware pgsql, I
question the solidity and reliability of the current linux kernel
implementation in a NUMA
On Tue, Jul 24, 2012 at 6:23 PM, John Lister john.lis...@kickstone.com wrote:
Cheers, I'll give it a go, I wonder if this is likely to be integrated into
the main code? As has been mentioned here before, postgresql isn't as badly
affected as mysql for example, but I'm wondering if the trend to
Newer Linux systems with lots of cores have a problem I've been running
into a lot more lately I wanted to share initial notes on. My newer
means running the 2.6.32 kernel or later, since I mostly track
enterprise Linux distributions like RHEL6 and Debian Squeeze. The
issue is around Linux's
On Tue, Jul 17, 2012 at 7:52 PM, Greg Smith g...@2ndquadrant.com wrote:
Newer Linux systems with lots of cores have a problem I've been running into
a lot more lately I wanted to share initial notes on. My newer means
running the 2.6.32 kernel or later, since I mostly track enterprise Linux
On the larger, cellular Itanium systems with multiple motherboards (rx6600
to Superdome) Oracle has done a lot of tuning with the HP-UX kernel calls
to optimize for NUMA issues. Will be interesting to see what they bring to
Linux.
On Jul 17, 2012 9:01 PM, Scott Marlowe scott.marl...@gmail.com
On Tue, Jul 17, 2012 at 11:00 PM, Scott Marlowe scott.marl...@gmail.com wrote:
Thanks for the link, I'll read up on it. I do have access to large
(24 to 40 core) NUMA machines so I might try some benchmarking on them
to see how they work.
It must have been said already, but I'll repeat it
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