| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Mark Wong <markw(at)osdl(dot)org>, Sean Chittenden <sean(at)chittenden(dot)org>, Kevin Brown <kevin(at)sysexperts(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: mmap (was First set of OSDL Shared Mem scalability results, |
| Date: | 2004-10-16 01:22:03 |
| Message-ID: | 200410160122.i9G1M3h03028@candle.pha.pa.us |
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| Lists: | pgsql-performance |
Tom Lane wrote:
> Mark Wong <markw(at)osdl(dot)org> writes:
> > I know where the do_sigaction is coming from in this particular case.
> > Manfred Spraul tracked it to a pair of pgsignal calls in libpq.
> > Commenting out those two calls out virtually eliminates do_sigaction from
> > the kernel profile for this workload.
>
> Hmm, I suppose those are the ones associated with suppressing SIGPIPE
> during send(). It looks to me like those should go away in 8.0 if you
> have compiled with ENABLE_THREAD_SAFETY ... exactly how is PG being
> built in the current round of tests?
Yes, those calls are gone in 8.0 with --enable-thread-safety and were
added specifically because of Manfred's reports.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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