Figure 13. Both Write-Only Threads Running On Node 0 (Different Cores) Under Medium; Figure 14. Both Write-Only Threads Running On Node 0 (Different Cores) Under High - AMD Athlon 64 Manuallines

40555 Rev. 3.00 June 2006
1.8
1.6
1.4
1.2
0.8
0.6
0.4
0.2
Figure 13. Both Write-Only Threads Running on Node 0 (Different Cores) under
Medium Background Load (High Subscription)
1.8
1.6
1.4
1.2
0.8
0.6
0.4
0.2

Figure 14. Both Write-Only Threads Running on Node 0 (Different Cores) under High

Background Load (High Subscription)
As shown in Figure 15 below, the advantage disappears at very high loads and the 0 hop-1 hop case
becomes slower than the 0 hop-0 hop case.
Chapter 3
Performance Guidelines for AMD Athlon™ 64 and AMD Opteron™
Medium: Total Time for both threads (write-write)
146%
129%
1
0 Hop 0 Hop
0 Hop 1 Hop
0
0.0.w.0 0.1.w.0 (0 Hops) (0 Hops)
0.0.w.0 0.1.w.1 (0 Hops) (1 Hops)
0.0.w.0 0.1.w.2 (0 Hops) (1 Hops)
0.0.w.0 0.1.w.3 (0 Hops) (2 Hops)
High: Total Time for both threads (write-write)
146%
136%
1
0 Hop 0 Hop
0 Hop 1 Hop
0
0.0.w.0 0.1.w.0 (0 Hops) (0 Hops)
0.0.w.0 0.1.w.1 (0 Hops) (1 Hops)
0.0.w.0 0.1.w.2 (0 Hops) (1 Hops)
0.0.w.0 0.1.w.3 (0 Hops) (2 Hops)
Analysis and Recommendations
ccNUMA Multiprocessor Systems
139%
129%
0 Hop 0 Hop
1 Hop 2 Hop
146%
135%
0 Hop 0 Hop
1 Hop 2 Hop
33