next up previous contents
Next: Single core versus dual Up: NEMO performance Previous: NEMO performance   Contents

Scaling for equal grid dimensions

We begin by investigating the scaling of the code for grids of equal dimension, i.e where jpni = jpnj. This restricts us to a relatively small number of processors counts ranging from 64 (8x8) to 1024 (32x32). The PathScale compiler is used for processor counts less than 96. The results are shown in figure 3.
Figure 3: Performance of NEMO when $jpni=jpnj$ for the PGI and PathScale compiler suites.
Image equalgriddims

From figure 3 it is clear that the PGI compiler performs slightly better (a few percent) than the PathScale compiler.