AMD 64 manual Reading and Interpreting Test Graphs, Axis Display

40555 Rev. 3.00 June 2006	Performance Guidelines for AMD Athlon™ 64 and AMD Opteron™
	ccNUMA Multiprocessor Systems

characterization of the resource behavior in the system. These recommendations, coupled with these interesting cases, provide an understanding of the low-level behavior of the system, which is crucial to the analysis of larger real-world workloads.

2.3Reading and Interpreting Test Graphs

Figure 3 below shows one of the graphs that will be discussed in detail later.

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T im e for w rite

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0 Ho p 1 Ho p 1 H o p 2 Ho p

0 .0 .w .0 0 .0 .w .1 0 .0 .w .2 0 .0 .w .3

Figure 3. Write-Only Thread Running on Node 0, Accessing Data from 0, 1 and 2 Hops Away on an Idle System

2.3.1X-Axis Display

The X-axis displays the various thread and memory placement combinations to be compared. Each case shows the following information for the thread, in the order listed:

•The node and core on which the thread is run.

•Whether accesses are read-only or write-only.

•The node on whose physical memory the data accessed by the thread resides. In Figure 3 above, the four bars correspond to the following thread combinations: 0.0.w.0—Thread running on node 0/core0 does write-only accesses to memory resident on node 0. 0.0.w.1—Thread running on node 0/core0 does write-only accesses to memory resident on node 1. 0.0.w.2—Thread running on node 0/core0 does write-only accesses to memory resident on node 2. 0.0.w.3—Thread running on node 0/core0 does write-only accesses to memory resident on node 3.

Chapter 2 Experimental Setup 17