[Pw_forum] a problem with 64-bit OS by multiprocess calculation

[Alexej Mazheika]

Hi

I apply Espresso-package under Linux with mpich2 applying it for parallel
processes calculations. The Espresso I compiled from source-files with
mpich2-compilers. I noticed a strange phenomenon. The CPU of my PC is Intel
Core Quad (64-bit). When I make my calculations under 64-bit linux-system
(openSUSE 11.0) it lasts longer than under 32-bit one (openSUSE-11.0). For
example, the average time of SCF procedure of my task is 8 min under 64-bit
OS vs 7 min under 32-bit OS. Can this problem be binded with installation or
work of Espresso? If yes, then how to solve it? I asked the developers of
mpich2 about it, and they couldn't help me.

regards,

Alex Mazheika, Research institut for Physical Chemical Problems of BSU,
Leningradskayastr. 14, 220050 Minsk, Belarus
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