Dear all
I wrote a code using deal.II. Now, I want to compare effect of the number
of cores on the simulation time. The code is developed based on step-42
from deal.II tutorial.
The code is executed in Ubuntu 14.04, Intel core i5 and 4GB ram as,
mpirun –n <number of cores> ./code parameter_file.prm
The obtained results for 1, 2 and 4 cores is,
Number of cores | Total wall clock time
1 | 1.22s
2 | 0.90s
4 | 0.93s
Why the wall clock time for 4 cores is greater than the one obtained with 2
cores.
I also executed step-42 (Just 2 cycles) and the same pattern is observed,
Number of cores | Total wall clock time
1 | 4.73s
2 | 4.13s
4 | 5.89s
Best
Pasha
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