> > Have you seen any real world example of this? 
> 
> At the unsophisticated end, there are lots of (Fortran) HPC applications
> with very large static array declarations but only "use" a small fraction
> of that.  Those users know they only need a small fraction and are happy
> to volunteer small physical memory limits that we (admins/queuing
> systems) can apply.
> 
> At the sophisticated end, the use of numerous large memory maps in
> parallel HPC applications to gain visibility into other processes is
> growing.  We have processes with VSZ > 400GB just because they have
> 4GB maps into 127 other processes.  Their physical page use is of
> the order 2GB.

Ah, agreed.
Fujitsu HPC user said similar things ago.



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