quickstep-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From navsan <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #41: Remove misleading comment about hash t...
Date Mon, 27 Jun 2016 18:58:45 GMT
Github user navsan commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/41#discussion_r68635473
  
    --- Diff: relational_operators/HashJoinOperator.cpp ---
    @@ -65,21 +65,11 @@ DEFINE_bool(vector_based_joined_tuple_collector, false,
                 "If true, use simple vector-based joined tuple collector in "
                 "hash join, with a final sort pass to group joined tuple pairs "
                 "by inner block. If false, use unordered_map based collector that "
    -            "keeps joined pairs grouped by inner block as they are found "
    -            "(this latter option has exhibited performance/scaling problems, "
    -            "particularly in NUMA contexts).");
    +            "keeps joined pairs grouped by inner block as they are found.");
    --- End diff --
    
    My rudimentary profiling also gave the same results. I’ll wait for others to opine.
If there are no objections, I’ll remove it.
    
    
    > On Jun 27, 2016, at 13:57, Harshad Deshmukh <notifications@github.com> wrote:
    > 
    > In relational_operators/HashJoinOperator.cpp <https://github.com/apache/incubator-quickstep/pull/41#discussion_r68635258>:
    > 
    > > @@ -65,21 +65,11 @@ DEFINE_bool(vector_based_joined_tuple_collector, false,
    > >              "If true, use simple vector-based joined tuple collector in "
    > >              "hash join, with a final sort pass to group joined tuple pairs
"
    > >              "by inner block. If false, use unordered_map based collector that
"
    > > -            "keeps joined pairs grouped by inner block as they are found "
    > > -            "(this latter option has exhibited performance/scaling problems,
"
    > > -            "particularly in NUMA contexts).");
    > > +            "keeps joined pairs grouped by inner block as they are found.");
    > I don't mind removing it. If I recall correctly, an older profiling done by @pateljm
<https://github.com/pateljm> revealed that map collector outperformed the vector collector
pretty much always.
    > 
    > —
    > You are receiving this because you were mentioned.
    > Reply to this email directly, view it on GitHub <https://github.com/apache/incubator-quickstep/pull/41/files/258970235f2b2d62cb4faefeffe1d2a8ccd53bc1#r68635258>,
or mute the thread <https://github.com/notifications/unsubscribe/ACZB62AXjOwQg0eKFvaerORVzB3rYcSrks5qQB0XgaJpZM4I_RVv>.
    > 
    



---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---

Mime
View raw message