On Wed, Dec 3, 2008 at 4:51 PM, Tony Travis <[EMAIL PROTECTED]> wrote:
> Chris Rowson wrote: > > [...] > > I've always used 32bit edition on servers myself. I've heard horror > > stories about perl scripts using twice as much memory under 64bit etc, > > etc.... I've never tested PAE with more than 4GB of RAM - I had heard > > about the single process limitation, but as I only had 4GB to play with, > > I've never had the opportunity to hit that limit! > > Hello, Chris. > > In fact you can only alloc() 2GB in a contiguous block if you have 4GB > RAM installed. You can get somewhere near 3GB in total per process if > you don't care about memory fragmentation with 4GB RAM installed. > > Things improve quite a lot with 8GB installed, but you still can't get > >4GB per process using PAE. For many programs that's not a problem, and > you're right about 64-bit doubling the size of memory usage in certain > situations. Actually, I don't think 64-bit is worth it unless you have > very BIG memory problems to solve. PAE is quite good if you want to run > multiple instances of programs that have < 4GB memory footprints. > > Bye, > > Tony. > -- > Dr. A.J.Travis, University of Aberdeen, Rowett Institute of Nutrition > and Health, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, Scotland, UK > tel +44(0)1224 712751, fax +44(0)1224 716687, http://www.rowett.ac.uk > mailto:[EMAIL PROTECTED], > http://bioinformatics.rri.sari.ac.uk/~ajt<http://bioinformatics.rri.sari.ac.uk/%7Eajt> > Thanks Tony, As ever you helped expand my mind on the list :-) Chris
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