Influence of the "0" processor location

Table 15 shows the influence of the location of the "0" processor on the performance. The inter-cluster performance is best when the "0" processor is located on the fastest processor. This is expected as the "0" processor initiates the global communication and writes data.

Table 15: Influence of the "0" processor location

Name of cluster(s)	CPUs	262K	568K
nina-pf	4-4	1.2	-
pf-nina	4-4	1.7	-
nina-cemef	4-4	1.7	-
cemef-nina	4-4	4.6	-
iusti-cemef	4-4	2.5	1.8
cemef-iusti	4-4	2.9	2.4