On Aug 28, 2010, at 20:14 , Vo, Trinh (388C) wrote: > For all my jobs, the wall time is usually significantly larger than > the CPU time > [...] I don?t know what are the possible reasons that causes this > delay.
1) time spent in I/O 2) time spent in communications (in parallel execution) > What factors I should look at to fix this problem. 1) reduce I/O, or use fast I/O channels 2) faster communication hardware, or usage of parallelization levels requiring less communications. More in the user guide P. --- Paolo Giannozzi, Dept of Physics, University of Udine via delle Scienze 208, 33100 Udine, Italy Phone +39-0432-558216, fax +39-0432-558222
