Matthias Boehm created SYSTEMML-1838:

             Summary: Performance issues sparse/ultra-sparse binary read
                 Key: SYSTEMML-1838
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm

Recent experiments with PageRank (20 iterations) on a 1M x 1M, sp=0.001 input 
showed that the actual iterations are indeed very fast, at peak memory 
bandwidth (i.e., ~500ms per iteration in CP only) but the initial read is 
unnecessarily slow, and thus dominating the entire execution time. For example, 
in this scenario, the read took 41s. 

This task aims to improve the read performance of sparse and ultra-sparse 
matrices into CP.

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