Matthias Boehm created SYSTEMML-1767:
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Summary: Performance issues codegen rowwise (column aggregation)
w/ wide matrices
Key: SYSTEMML-1767
URL: https://issues.apache.org/jira/browse/SYSTEMML-1767
Project: SystemML
Issue Type: Bug
Reporter: Matthias Boehm
On scenarios with wide matrices of millions of features, the codegen rowwise
template shows performance issues due to unnecessary multi-threading which
requires additional memory per thread for partial aggregation which leads to
cache thrashing. We should similarly to the mmchain operator establish a
threshold for maximum temporary results and fall back to sequential operations
if this threshold is exceeded.
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