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Subject Performance differences between SystemML LibMatrixMult and Breeze with native BLAS
Date Wed, 30 Nov 2016 22:54:19 GMT
Hi all,

I have run a very quick comparison between SystemML's LibMatrixMult and 
Breeze matrix multiplication using native BLAS (OpenBLAS through 
netlib-java). As per my very small comparison I get the result that 
there is a performance difference for dense-dense Matrices of size 1000 
x 1000 (our default blocksize) with Breeze being about 5-6 times faster 
here. The code I used can be found here:

Running this code with 50 iterations each gives me for example average 
times of:
Breeze:         49.74 ms
SystemML:   363.44 ms

I don't want to say this is true for every operation, but those results 
let us form the hypothesis that native BLAS operations can lead to a 
significant speedup for certain operations which is worth testing with 
more advanced benchmarks.

Btw: I am definitely not saying we should use Breeze here. I am more 
looking at native BLAS and LAPACK implementations in general (as 
provided by OpenBLAS, MKL, etc.).

Let me know what you think!

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