Horton

Re: mmap (was First set of OSDL Shared Mem scalability results,

Bruce Momjian <pgman@candle.pha.pa.us>

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From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Mark Wong <markw@osdl.org>, Sean Chittenden <sean@chittenden.org>, Kevin Brown <kevin@sysexperts.com>, pgsql-performance@postgresql.org
Date: 2004-10-16T01:22:03Z
Lists: pgsql-performance 
Tom Lane wrote:
> Mark Wong <markw@osdl.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.

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