Re: postgresql and smp linux kernel

On Mon, 2004-08-09 at 11:10, zhicheng wang wrote:
> Dear all
>
> i have a dedicated server mainly running postgresql,
> currently rh-posgtresql-7.3.6.7 (and samba, ypbind
> etc). The server is a dual processor machine and the
> OS is RHEL AS 3.
>
> I am currently running kernel-smp-2.4.21-15.0.4.EL.
>
> My question is: do i need to run smp kernel for
> postgresql? What is benefit of it? If I run UP kernel,
> what do I lose from the point view of PG?

You do not NEED it for Pg, but it will improve performance.  Each
separate session gets a different process and therefore has a change to
run on the second processor concurrently with another session on the
first processor.  The same goes for any other processes that are
running, of course.

If you do not use an SMP kernel, one of your processors will sit there
for ever doing nothing, which is money down the drain.

--
Oliver Elphick                                          olly@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
GPG: 1024D/A54310EA  92C8 39E7 280E 3631 3F0E  1EC0 5664 7A2F A543 10EA
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