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From saketj <...@git.apache.org>
Subject [GitHub] incubator-quickstep issue #114: QUICKSTEP-59 Convert setBitRegularVersion() ...
Date Fri, 21 Oct 2016 03:29:10 GMT
Github user saketj commented on the issue:

    https://github.com/apache/incubator-quickstep/pull/114
  
    It turns out that these queries have very few scan (selection) operations as compared
to other queries and mostly involve joins where BitVectors might not be aggressively used.
Also, if the selectivity is high, branch predictions will anyway be more-or-less accurate.
(more so after the LIP filter optimization).
    However, another interesting thing is that for these queries 09, 20, 21, the differences
are actually not high across different trials. A cold cache may be playing some tricks, when
we report our aggregate numbers.
    
    
    | Query 9  | w/o PR (ms) | w/ PR (ms) |
    |----------|-------------|------------|
    | Trial 1  | 110251      | 42551      |
    | Trial 2  | 13763       | 14386      |
    | Trial 3  | 10302       | 10129      |
    | Trial 4  | 11783       | 10616      |
    | Trial 5  | 10070       | 9243       |
    |          |             |            |
    |          |             |            |
    | Query 20 | w/o PR (ms) | w/ PR (ms) |
    | Trial 1  | 85988       | 104532     |
    | Trial 2  | 56639       | 58389      |
    | Trial 3  | 50041       | 51712      |
    | Trial 4  | 54269       | 50740      |
    | Trial 5  | 49688       | 50723      |
    |          |             |            |
    |          |             |            |
    | Query 21 | w/o PR (ms) | w/ PR (ms) |
    | Trial 1  | 126323      | 142742     |
    | Trial 2  | 120334      | 119632     |
    | Trial 3  | 126304      | 115668     |
    | Trial 4  | 115185      | 114618     |
    | Trial 5  | 114663      | 113232     |


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