|N pix||d||D||N stokes||w max||N S||N W||Δt,Δν||t CF||t grid||t el||t W||Memory|
|(deg)||(km)||(s, MHz)||(h, MHz)||(%)||(%)||(%)||(%)||(Gb)||(s)|
|1024||40||11.4||IQUV||20||15||14||300, 0.78||3, 3.5||67.8||10.2||19.7||2.1||1||40.9|
|4096||10||11.4||IQUV||20||15||14||300, 0.78||3, 3.5||24.5||4.9||57.5||12.8||4.5||117.4|
Notes. Columns list various performance parameters corresponding to different imaging settings. The tests were performed for a 12 sub-band dataset (1 channel per sub-band) on the CEP2 LOFAR cluster node each having 24 AMD Opteron(tm) 6172 Processors, and 64 Gb of RAM memory. is the total time for a gridding or degridding step. The times tCF, tgrid, tel, and tW are given as fractions of , and they correspond to the times needed to compute convolution functions, grid/degrid the data, apply the element beam and apply the W-term, respectively. We are confident we can still gain a factor of ≳ 2–4 in time over these values.
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