[Pw_forum] Memory usage by pw.x

[Paolo Giannozzi]

Hi Guido

> I'm trying to quantify the memory usage by pw.x

good luck. Understand how much memory a code really uses is
highly nontrivial, due to the way modern operating systems work
(shared libraries, files kept in RAM, ...)

> at the beginning of the SCF cycle the message "per-process
> dynamical memory:" reports the memory allocated at that time
> (clib/memstat.c), but this value is significantly less than the one
> I can see by monitoring the process by the "top" command, as
> more memory is allocated afterwards. Let me guess that calling
> again memstat later on, eg in c_bands, could provide one a more
> precise estimate, but maybe you can suggest a better approach

>

I cannot

P.
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Paolo Giannozzi, Dept of Chemistry&Physics&Environment,
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222