Opteron Large Memory Compilers?

Donald Becker becker at scyld.com
Fri Jun 13 16:56:28 EDT 2003

On Fri, 13 Jun 2003, Chris Oubre wrote:

>      We are looking into the feasibility of using Opterons in on
> cluster.  One major issue we had when we benchmarked on them was the
> lack of large memory support in the compilers we used.  We tried to run
> large memory jobs on an Opteron using the Portland Compilers and found
> that it would not compile jobs larger than 2 Gigs.

Could you please clarify?
 Does the compiler not compile and link an executable larger than 2GB, or
 Does the program fail when dynamic libraries put the total size >2GB, or
 Does the executable not work with a data set larger than 2GB?

It must be the last, since even the most bloated programs don't go much
over 100MB of compiled code.

>      Has anyone run jobs > 2 Gigs on a Opteron?  And if so which
> compiler did you use. And finally what is the current consensus on which
> Opteron compiler is best for large memory jobs.

Donald Becker				becker at scyld.com
Scyld Computing Corporation		http://www.scyld.com
914 Bay Ridge Road, Suite 220		Scyld Beowulf cluster system
Annapolis MD 21403			410-990-9993

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