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Table 2.

Imaging runtime on the “Dawn” cluster, using both CPU sockets of each of the 15 compute nodes.

Imaging method Run time Factor Throughput
w-stacking default 4 min 1 720
(o = 63, nwl = 32, p = 1.2)
w-stacking minimum 7 min 1.75 410
(o = 4 K, nwl = 500, p = 1)
w projection 27 min 6.75 110
Direct transform 38 h 570 1.3
IDG CPU 4 min 1 720
IDG GPU 16 s 0.07 11000

Notes. The IDG GPU imager additionally uses one of the Tesla K40 GPUs on each node. The factor is the relative time with respect to w stacking with default settings. The last column specifies the visibility throughput for a single node.

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