Joe McDonnell created IMPALA-15713:
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Summary: Use sized deletes to optimize malloc interactions
Key: IMPALA-15713
URL: https://issues.apache.org/jira/browse/IMPALA-15713
Project: IMPALA
Issue Type: Improvement
Components: Backend
Affects Versions: Impala 5.0.0
Reporter: Joe McDonnell
On free, a malloc implementation needs to know the size of the pointer being
freed. This can involve a lookup in a data structure to find the corresponding
size for the pointer passed in. There are now sized delete APIs where the
caller can pass in the known size so the malloc implementation can avoid a
lookup. Google TCMalloc does benefit from sized deletes. (Obviously, the passed
in size must be correct or it will trip ASAN and other checks.)
We should adapt our code to use sized deletes whenever possible. For example,
the MemPool uses malloc/free and knows the size. There are several other
locations where we keep the size information and have it available when freeing
the pointer.
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