Tim Armstrong created IMPALA-9382:
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Summary: Improve memory efficiency of RuntimeProfile objects
Key: IMPALA-9382
URL: https://issues.apache.org/jira/browse/IMPALA-9382
Project: IMPALA
Issue Type: Sub-task
Components: Backend
Reporter: Tim Armstrong
RuntimeProfile trees can potentially stress the memory allocator and use up a
lot more memory and cache than is really necessary:
* std::map is used throughout, and allocates a node per map entry. We do depend
on the counters being displayed in-order, but we would probably be better of
storing the counters in a vector and lazily sorting when needed (since the set
of counters is generally static after Prepare()).
* We store the same counter names redundantly all over the place. We'd probably
be best off using a pool of constant counter names (we could just require
registering them upfront).
There may be a small gain from switching thrift to using unordered_map, e.g.
for the info strings that appear with some frequency in profiles.
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