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MCOL-505 Performance improvements to ExeMgr

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This fix improves the performance of ExeMgr by doing the following:

* Significantly reduces the amount of time the xml configuration is
scanned
* Uses a much faster way to determine the CPU core count
* Reduces the amount of times certain allocations are executed
* Rowgroup pre-allocates vectors for 1024 rows

This improves performance for the first query of a connection and the
performance for smaller result sets. It may well improve performance in
other areas too.
This commit is contained in:
Andrew Hutchings
2017-01-12 16:58:16 +00:00
parent ae630b3375
commit 2f3937ac7e
4 changed files with 37 additions and 44 deletions
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9
utils/rowgroup/rowgroup.cpp
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@@ -800,7 +800,14 @@ int64_t Row::getSignedNullValue(uint32_t colIndex) const
RowGroup::RowGroup() : columnCount(0), data(NULL), rgData(NULL), strings(NULL),
useStringTable(true), hasLongStringField(false), sTableThreshold(20)
{ }
{
oldOffsets.reserve(1024);
oids.reserve(1024);
keys.reserve(1024);
types.reserve(1024);
scale.reserve(1024);
precision.reserve(1024);
}
RowGroup::RowGroup(uint32_t colCount,
const vector<uint32_t> &positions,