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

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Mark Wong <markw(at)osdl(dot)org>
Cc: 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, some wierdness ...
Date: 2004-10-15 21:37:50
Message-ID: 26542.1097876270@sss.pgh.pa.us
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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?

regards, tom lane

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