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Table 2 Execution time scaling of a Wiener filter reconstruction on a grid of size \(8192 \times 8192\)

From: d2o: a distributed data object for parallel high-performance computing in Python

\(\#\mathrm {nodes}\) 1 1 1 1 2 4 8 16 32
\(\#\mathrm {processes:~} n\) 1 2 3 4 8 16 32 64 128
t [S] 1618 622.0 404.2 364.2 181.7 94.50 46.79 18.74 8.56
\(s_n = 2t_2/t_n\) 0.769 2.00 3.08 3.42 6.85 13.2 26.6 66.4 145
\(q_n = {1/(1+\log (\frac{n}{s_n}))}\) 0.900 1.00 1.01 0.94 0.94 0.92 0.93 1.02 1.06