Hi,
I just ported a 1D hydro code that I've been running on various Unix
machines for years, most recently on a Dell with Xeon (Intel) chips
running Linux, to my new G5 (with XLF). I'm trying to compare the run
statistics and memory requirements on the two machines, after setting
the compiler parameters to as close a match as I can figure out, but am
confused about the terminology because it isn't identical between the
Activity Monitor on the G5 and the System Monitor on the Linux box. The
Activity Monitor shows Real, Virtual, Shared, Private, and Virtual
Private memory usage, while the Linux monitor shows Total, RSS, and
Shared memory. I poked around a bit on the Apple support site and
couldn't find an explanation of the Private and Virtual Private memory;
does anyone know what this means? Also, what is RSS memory (on the
Dell)?
If you could point me to a likely place (website or text) to find
explanations I would greatly appreciate it. Also, if anyone else has
ported a CFD Fortran code to the G5 and has some pointers on how to
maximize efficiency via XLF options (beyond the obvious, like
qtune=g5), please share what you've learned. Thanks alot for your help!
Dr. Judith T. (Judy) Karpen
Code 7675K
Naval Research Laboratory
Washington, DC 20375-5352
email: judy:karpen@nrl:navy:mil (replace colons by dots)
phone: 202-767-3441
"For every problem there is one solution that is simple, neat, and
wrong" -- H.L. Mencken
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