Re: OSDL DBT-2 w/ PostgreSQL 7.3.4 and 7.4beta5

From: Mark Wong <markw(at)osdl(dot)org>
To: Manfred Spraul <manfred(at)colorfullife(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org, osdldbt-general(at)lists(dot)sourceforge(dot)net
Subject: Re: OSDL DBT-2 w/ PostgreSQL 7.3.4 and 7.4beta5
Date: 2003-11-02 02:00:35
Message-ID: 20031101180035.G2457@osdlab.pdx.osdl.net
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On Sat, Nov 01, 2003 at 02:37:21PM +0100, Manfred Spraul wrote:
> Tom Lane wrote:
>
> >markw(at)osdl(dot)org writes:
> >
> >
> >>7.4beta5 offers more throughput. One significant difference I see is in
> >>the oprofile for the database. For the additional 7% increase in the
> >>metric, there are about 32% less ticks in SearchCatCache.
> >>
> >>
> >
> >Hmm. I have been profiling PG for some years now, and I cannot remember
> >ever seeing a profile in which SearchCatCache topped everything else
> >(the usual suspects for me are palloc/pfree support code). Can you give
> >any explanation why it looks like that? Can your profiling code tell
> >where the hotspot call sites of SearchCatCache are?
> >
> If I understand the docs correctly, op_to_source -a can do that - the
> result is annotated assembly, with percentage numbers for each
> instruction. If the sources were compiled with -g2, even source level
> annotation is possible.
>
> Mark, do you still have the oprofile output? I don't understand why so
> much time is spent in the kernel signal handlers, i.e. I could use
> annotated assembly or source of linux/kernel/signal.c.

I've rerun a test, capturing the raw oprofile output, running opannotate for
source and assmebly output (links for each should be on the page now.) Let
me know if I've missed anything:
http://developer.osdl.org/markw/dbt2-pgsql/190/

I'm running a test with your patch now too. I should have results shortly.

Thanks,
Mark

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