Github user avulanov commented on the pull request:
https://github.com/apache/spark/pull/10806#issuecomment-209193632
Good point. According to matrices multiplication benchmark, we can get peak
performance on modern CPUs with square matrices somewhere between 4Kx4K and
8Kx8K. So, it worth using a bigger batch rather than 128.
https://docs.google.com/spreadsheets/d/1lWdVSuSragOobb0A_oeouQgHUMx378T9J5r7kwKSPkY/edit?usp=sharing
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