Horton

Re: spinlocks on HP-UX

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: pgsql-hackers@postgresql.org
Date: 2011-08-30T22:33:49Z
Lists: pgsql-hackers

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  1. Typo fixes.

Robert Haas <robertmhaas@gmail.com> writes:
> On Tue, Aug 30, 2011 at 4:37 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> If this is on Linux, I am surprised
>>> that you didn't get killed by the lseek() contention problem on a
>>> machine with that many cores.

>> Hm ... now that you mention it, all of these tests have been using
>> the latest-and-greatest unreleased RHEL kernels.

> It should be pretty easy to figure it out, though.   Just fire up
> pgbench with lots of clients (say, 160) and run vmstat in another
> window.  If the machine reports 10% system time, it's fixed.  If it
> reports 90% system time, it's not.

I ran it up to "pgbench -c 200 -j 200 -S -T 300 bench" and still see
vmstat numbers around 50% user time, 12% system time, 38% idle.
So no lseek problem here, boss.  Kernel calls itself 2.6.32-192.el6.x86_64.

			regards, tom lane