GEMM: Allocate memory for blocks only once
Submitted by Gael Guennebaud @ggael
Assigned to Nobody
Link to original bugzilla bug (#1364)
Description
Currently, for large enough matrices we dynamically allocate memory for the blocks for each call. With C++11 it should be possible to allocate only once at the first call in a thread safe manner. Of course, we would keep the current strategy as fallback for non C++11 builds.
Some questions through:
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shall we allocate for the maximal block size? This would be a waste of memory if the user only deal with, say, 50x50 matrices (blocks are much larger!)
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how to properly release the memory?