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Re: Freebsd vs linux and hardware question

From: Dror Matalon <dror(at)zapatec(dot)com>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: sfpug(at)postgresql(dot)org
Subject: Re: Freebsd vs linux and hardware question
Date: 2003-09-19 22:48:35
Message-ID: (view raw, whole thread or download thread mbox)
Lists: sfpug
On Fri, Sep 19, 2003 at 03:10:48PM -0700, Josh Berkus wrote:
> Dror,
> Howdy!   Long time, no hear.

Busy, busy as usal :-).

> > Any opinions on the advantages/disadvantages of running postgres on
> > Linux vs running it on freebsd?
> Several prominent members of the PostgreSQL community claim better performance 
> on BSD due to BSD's better I/O stack, plus the history of Ingres filesystem 
> optimization on BSD.  However, nobody has published figures.

That's what I thought, but I wasn't sure if recent improvements in linux
IO hasn't caused it to catch up. I know that Linux networking has
improved a lot in the last couple of years, but I wasn't sure if it and
the IO code has caught up with BSD.

> > Also, under either OS would a dual processor machine run faster than a
> > single processor one. For the most part, I know that databases are IO
> > bound rather than CPU, bound so more memory and more and faster disks
> > are a main issue. Still, it seems like being able to use multiple cpus
> > could improve performance.
> Not sure about BSD, but on Linux I know that Postgres will happily use up to 4 
> CPUs for simultaneos seperate requests.  This doesn't help with modular large 
> queries/procedures, but does help a lot for concurrent users.


> > 
> > Finally, is SCSI still such a big improvement over modern IDE drives?
> Yes. ;-)
> But hey, why are you asking this stuff?  Don't you run Zapatec's stuff off a 
> huge SAN?

It's not so Huge, out netapp is less than 200 Megs. But the real issue
is that it works really well for small data sets but not for big ones. 

We're working on a new application that will handle millions of rows.
Currently the table size is half a gig and growing. 

On this type of application the netapp is slower than local disks. So
we're thinking of setting up a new machine with plenty of power. I'm
trying to figure out what the right configuration would be both in terms
of the hardware and the OS.

Any pointers to recommended hardware configurations?



> -- 
> -Josh Berkus
>  Aglio Database Solutions
>  San Francisco

Dror Matalon, President
Zapatec Inc 
1700 MLK Way
Berkeley, CA 94709

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