This is a plot of the write wall clock time in seconds vs the number of
processors.
There are three curves, one for the small-grid case (50×50×50
in each zone), one for the medium-grid case (150×150×150 in
each zone), and one for the large-grid case (250×250×250 in
each zone).
For all three grids, the times increase gradually with the number of
processors.
- For the small-grid case, the time increases very gradually, from
nearly 0 for 1 processor to about 1 for 16 processors.
- For the medium-grid case, the time increases linearly from about
3.5 for 1 processor to about 5 for 8 processors, then jumps to 15
for 16 processors.
- For the large-grid case, the time is about 16 for 1 or 2
processors, jumps to about 20 for 4 or 8 processors, then jumps
again to about 36 for 16 processors.