USQCD Machine Performance Cluster Processor Nodes DWF per node Clover per node asqtad per node qcd 2.8 GHz Single CPU Single Core P4E 124 1400 MFlops 1096 MFlops 1017 MFlops pion 3.2 GHz Single CPU Single Core Pentium 940 518 1729 MFlops 1120 MFlops 1594 MFlops kaon 2.0 GHz Dual CPU Dual Core Opteron 600 4696 MFlops 3180 MFlops 3832 MFlops 7N 1.9 GHz Dual CPU Quad Core Opteron 396 8800 MFlops 5148 MFlops 6300 MFlops 6N 3.0 GHz Single CPU Dual Core Pentium 256 2900 MFlops 1408 MFlops 1960 MFlops 4G 2.8 GHz Single CPU Single Core Xeon 384 1582 MFlops 636 MFlops 1249 MFlops BlueGene/P 850 MHz Quad Core PowerPC 850 4 cores/node, 1024 nodes/rack 2560 MFlops 2680 MFlops Cray XT4 2.6 GHz Dual Core Opteron ??? 2660 MFlops 2340 MFlops The table above shows the measured performance of DWF, anisotropic clover, and asqtad inverters on the qcd, pion, kaon, 6N, and 4G clusters, and on the ANL BG/P and the ORNL XT4. For qcd and pion, the asqtad numbers were taken on 64-node runs, 14^4 local lattice per node, and the DWF numbers were taken on 64-node runs using Ls=16, averaging the performance of 32x8x8x8 and 32x8x8x12 local lattice runs together. The DWF, Clover and asqtad performance figures for kaon, 6N, and 7N use 128-process (32-node, 64-node, and 16-node respectively) runs, with 4, 2, or 8 processes per node, one process per core. Clover performance on 7N used 128 processes with 4^3x8 local volumes per process. The DWF and Clover performance runs for 4G used single panels (128 node jobs, 1 core/node) with mesh layouts of 1x4x4x8. The BG/P and XT4 DWF performance measurements used local volumes of 4^4 (Ls=16) and 6x6x6x4 per core, respectively. The BG/P asqtad result is the average of the performance of 6^4 and 8^4 local volumes, and is single precision. The BG/P DWF result is double precision.