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Optimization_4x4_11

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Jianyu Huang edited this page Aug 11, 2016 · 5 revisions

Copy the contents of file MMult_4x4_10.c into a file named MMult_4x4_11.c and change the contents:

Change the first lines in the makefile to

OLD  := MMult_4x4_10
NEW  := MMult_4x4_11
  • make run
octave:3> PlotAll        % this will create the plot

This time the performance graph will look something like

What we noticed is that for all optimizations so far, performance degraded considerably when the matrices involved were much bigger than could fit in the L2 cache. In this optimization, we create an extra level of blocking to overcome this. We now have a main routine that calls what is the inner kernel used by the GotoBLAS and BLIS, and then the AddDot4x4 routine is the micro-kernel used by BLIS.

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