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Table 2

Speedup for simultaneous vs. consecutive SHTs on a HEALPix grid with Nside = 1024 and lmax = 2048.

Transforms Tsimul/s Tseparate/s Speedup

1a0 12.65 12.65 1.00
2a0 18.06 25.30 1.40
3a0 23.47 37.95 1.62
5a0 34.77 63.25 1.82
10a0 62.56 126.50 2.02
3a0+3m0 41.72 77.46 1.85
1a0+1a1+1a2+1m0+1m1+1m2 78.79 129.44 1.64
4m2 63.68 112.40 1.77

Notes. The transforms are specified in an abbreviated fashion, where “5a2” signifies “5 alm → map SHTs of spin 2”, and “3m0” stands for “3 map → alm SHTs of spin 0”. The runs were performed on a single CPU core.

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