[jira] [Created] (IMPALA-9382) Improve memory efficiency of RuntimeProfile objects

["Tim Armstrong (Jira)" <ji...@apache.org>]

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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