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Re: postgresql benchmarking (was: Re: FreeBSD mysql Benchmark on 4BSD/ULE scheduler and i386/amd64)

On Wed, Mar 14, 2007 at 09:42:00AM +0300, Boris Samorodov wrote:
> (transferring the thread from freebsd-stable@ to freebsd-performance@)
> On Tue, 13 Mar 2007 20:55:46 -0400 Kris Kennaway wrote:
> > On the same test postgresql is indeed faster, I haven't finished
> > benchmarking it yet though.
> Kris, I'm interested at postgresql benchmarking at two-xeon-quad-core
> server with 3WARE RAID adapter. Can you give me some tips?
> Thank you.

Well I'm using sysbench and the collection of patches in my
kris-contention p4 branch.  Sorry, I don't have an extracted patch set
available for you to try, but we're hoping to get the most important
patches into 7.0 within a week or two.

On the pgsql side, disable the update_process_titles option (or
whatever it is called), because this has a 33% performance overhead
for me.  Also if you're testing over localhost, use a unix socket
instead of letting it use tcp because the latter is easily saturated
when you have many CPUs running client threads, and peak performance
is less than half of what it is over a unix socket.  ULE is faster on
7.0, but currently has some performance problems at intermediate
loads; Jeff hopes to fix this soon.

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