Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/10306#issuecomment-171834736
Regarding your local performance test:
1. Make sure you installed optimized BLAS on your system and loaded
correctly in JVM via netlib-java. The different should be significant at
3000x3000 (with or without multi-treading).
2. Your test of GEMM and AXPY is not equivalent. First of all, they are not
using the same matrices for multiplication. Secondly, ` axpy(1.0, bb(j),
aa(j))` should be ` axpy(1.0, bb(j), aa(i))`. Otherwise, you get some benefit
from local caching.
Could you re-run the test? I will take a look at your implementation.
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