Block ordering during a reduction

[mrzv]

Issue by Dmitriy Morozov
Friday Jan 16, 2015 at 22:28 GMT

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In the out-of-core regime, there is room to schedule how blocks are ordered during diy::reduce(). In principle, the full order of active blocks is known ahead of time, so one could reorder the blocks optimally so that the number of movements of blocks out of core is minimized. We need to figure out which algorithm to use for this and implement this feature.