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. Iâll wait for others
to opine. If there are no objections, Iâll remove it.
> On Jun 27, 2016, at 13:57, Harshad Deshmukh <[email protected]>
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.
>
> â
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