Firefly and PC GAMESS-related discussion club


 
Learn how to ask questions correctly  
 
 
We are NATO-free zone
 


Firefly's parallel calculation: can't get fully CPU load

Alexey
alexfarlong56@gmail.com

So far I've been used windows version of PC-GAMESS in parallel mode on multi-core CPU (4 cores). It works fine and logical:
1 thread  - 25% CPU load (total 25)
2 threads - 25+25% CPU load (total 50)
3 threads - 25+25+25% CPU load (total 75)
4 threads - 25+25+25+25% CPU load (total 100)

Recently there were some reasons and I've changed PC-GAMESS to FIREFLY 7. But CPU load distribution in parallel mode is the following:
1 thread  - 50% CPU load (total 50)
2 threads - 25+25% CPU load (total 50)
3 threads - 25+12+13% CPU load (total 50)
4 threads - 25+8+8+9% CPU load (total 50)

There's a string "PARALLEL VERSION (UNIFIED) RUNNING USING    4 PROCESSES (NODES)" in the resulting file. The name of .dll for parallel calculations is "mpibind.nt-mpich-smp.dll".

Who knows what the problem is?
Thanks.

[ Previous ] [ Next ] [ Index ]           Wed Mar 13 '13 12:10pm
[ Reply ] [ Edit ] [ Delete ]           This message read 924 times