Matthias Boehm created SYSTEMML-2073:
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Summary: Lost update on high frequency statistics maintenance
Key: SYSTEMML-2073
URL: https://issues.apache.org/jira/browse/SYSTEMML-2073
Project: SystemML
Issue Type: Bug
Reporter: Matthias Boehm
The recently introduced lock-free statistics maintenance (SYSTEMML-2069) has an
issue of lost updates under high-frequency updates of hot opcodes. For example,
the following script
{code}
parfor(j in 1:24)
for(i in 1:10000000)
q = nrow(Y);
{code}
gives the following statistics (counts of 240,000,000 are expected here)
{code}
# Instruction Time(s) Count
1 nrow 95.118 239999993
2 mvvar 64.423 239999957
{code}
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