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Re: RAM question for everyone!



On Fri, 2009-01-23 at 11:07 -0500, Mark Haney wrote:
> Bryn M. Reeves wrote:
> > Mark Haney wrote:
> >> Dan Track wrote:
> >>> I was recently asked a question about how much RAM should there be
> >>> within a server given that the APP uses 8GB of Memory, should I buy
> >>> 10Gig of memory and have a small harddrive and no swap space? Would
> >>> this configuration allow everything in my OS to run from RAM and not
> >>> from swap? If this is the case then there's no need to ever create
> >>> swap, is there?!?
> >>>
> >>> Your thoughts are appreciated.
> >>>
> >>> Thanks
> >>> Dan
> >>>
> >>
> >> With RAM, the more the merrier.  I guess the question is, what does this
> > 
> > Unless you're on a 32-bit system in which case more RAM can make you
> > much less merrier since the mere addition of the memory causes more
> > pressure on the already constrained lowmem available on these platforms.
> > 
> > Regards,
> > Bryn.
> > 
> 
> True, but the assumption was 64-bit since he says the app uses 8GB RAM.
> 
I guess I do not comprehend the issue of more memory stressing low
memory?

I know that a 32 bit system is constrained in addressing to something
like 4G, due to the intel addressing architecture, and 32 bit
constraint, so applications were developed to go beyond that.  But given
that the system maps the logical memory to physical memory, and some can
do this via hardware, how does adding more memory add more stress?  If
the system is running the application now, the basic change is reducing
swapping to disk, is it not?

Regards,
Les H


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