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Re: mmap (was First set of OSDL Shared Mem scalability results, some wierdness ... - Mailing list pgsql-performance

From Tom Lane
Subject Re: mmap (was First set of OSDL Shared Mem scalability results, some wierdness ...
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Msg-id 26542.1097876270@sss.pgh.pa.us
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In response to Re: mmap (was First set of OSDL Shared Mem scalability results, some wierdness ...  (Mark Wong <markw@osdl.org>)
Responses Re: mmap (was First set of OSDL Shared Mem scalability results, some wierdness ...
Re: mmap (was First set of OSDL Shared Mem scalability results,
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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?

            regards, tom lane

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