Re: postgresql and smp linux kernel

Thanks Oliver Elphick
does this mean that the applications do not need to be
multi-threading in order to use multi-processors?

cheng

--- Oliver Elphick <olly(at)lfix(dot)co(dot)uk> wrote:
> 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(at)lfix(dot)co(dot)uk
> Isle of Wight
> http://www.lfix.co.uk/oliver
> GPG: 1024D/A54310EA 92C8 39E7 280E 3631 3F0E 1EC0
> 5664 7A2F A543 10EA
>
> ========================================
> "Be still before the LORD and wait patiently
> for him;
> do not fret when men succeed in their ways,
> when they
> carry out their wicked schemes."
> Psalms 37:7
>
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=====
Best wishes
Z C Wang

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