Matthias Boehm created SYSTEMML-2147:
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Summary: Performance read of short and wide sparse matrices
Key: SYSTEMML-2147
URL: https://issues.apache.org/jira/browse/SYSTEMML-2147
Project: SystemML
Issue Type: Bug
Reporter: Matthias Boehm
Since for sparse matrix reads of many columns we synchronize over the first row
of a row of blocks, there is unnecessary contention with many read threads and
a small number of rows (e.g., 10K rows -> 10 blocks, but 24 threads reading)
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