On Wed, Apr 07, 2010 at 05:02:33PM -0400, Josh Malone wrote:

> >>> OS is Ubuntu 9.04 32Bit
> >>> IMHO it is better to migrate to a 64Bit-System!?
> >>
> >> I don't see an urgent reason to migrate to 64 bit... I would have
> >> installed this machine 64 bit at the beginning, just because it's a 64
> >> bit machine. You'll lose some performance, but it might be barely
> >> noticeable.
> > 
> > I'm not so sure that's the case. My understanding is that a 32-bit OS
> > can only address a little over 3GB of physical memory, since the
> > system has 8GB, I would think you would want to upgrade to a 64-bit
> > OK.
> > 
> > Richard
> 
> Using PAE, you can have >3.5 G of usable ram on a system. HOWEVER, each
> individual process only has a 4GB virtual address space, so only 4G of ram
> per process. If you have >1 memory-intensive process you can make use of 8G
> of ram on a 32-bit system.

Right. But we're talking about BackupPC_nightly here which doesn't
require loads of memory. As we can see in vmstat output, about 6 GB of
RAM are used as disk cache. So we're on the safe side here regarding
32bit vs. 64bit.

HTH,

Tino.

-- 
"What we nourish flourishes." - "Was wir nähren erblüht."

www.lichtkreis-chemnitz.de
www.tisc.de

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