[pymvpa] Time for single permutation varies between a few seconds and several minutes

Nick Oosterhof n.n.oosterhof at googlemail.com
Wed Apr 8 12:52:16 UTC 2015

On 08 Apr 2015, at 14:03, Jan Derrfuss <derrfuss at gmail.com> wrote:

> I'm stumped. I'm running a permutation for a searchlight analysis and print the time when the individual permutations start. I turns out that the onset times are sometimes mere seconds and sometimes several minutes apart.

Very quick (and maybe silly) idea: could this be due to disk i/o? When running a multi-core searchlight, data is stored to disc and and then loaded by each child process. One possibility is that after a few children have started, different processes are competing for disk i/o, slowing everything down.

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