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From "Dayue Gao (JIRA)" <>
Subject [jira] [Created] (KYLIN-2083) more RAM estimation test for MeasureAggregator and GTAggregateScanner
Date Tue, 11 Oct 2016 12:30:20 GMT
Dayue Gao created KYLIN-2083:

             Summary: more RAM estimation test for MeasureAggregator and GTAggregateScanner
                 Key: KYLIN-2083
             Project: Kylin
          Issue Type: Sub-task
          Components: Tools, Build and Test
    Affects Versions: v1.5.4.1
            Reporter: Dayue Gao
            Assignee: Dayue Gao
             Fix For: v1.6.0

Current RAM estimations of MeasureAggregator and GTAggregateScanner are based on test results
from AggregationCacheMemSizeTest. I'd like to see if there is room for improvement, and if
there is, how much.

Points I'm considering are:
# CompressedOops on vs off: when CompressedOops is off on large heap, each reference takes
8 bytes. I was wondering how much it will affect size of AggregationCache.
# variable length aggregator: does the current estimation works well on var-len aggregator
like BitmapAggregator
# heap usage count via GC vs Instrumentation: the current approach to obtain the actual heap
usage of objects seems fine, however, I was wondering if using Java instrumentation agent
will give us more precise number.

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