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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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24
utils/common/cgroupconfigurator.cpp
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@ -141,29 +141,7 @@ uint32_t CGroupConfigurator::getNumCoresFromProc()
GetSystemInfo(&siSysInfo);
return siSysInfo.dwNumberOfProcessors;
#else
ifstream cpuinfo("/proc/cpuinfo");
if (!cpuinfo.good())
return 0;
unsigned nc = 0;
regex re("Processor\\s*:\\s*[0-9]+", regex::normal|regex::icase);
string line;
getline(cpuinfo, line);
unsigned i = 0;
while (i < 10000 && cpuinfo.good() && !cpuinfo.eof())
{
if (regex_match(line, re))
nc++;
getline(cpuinfo, line);
++i;
}
uint32_t nc = sysconf(_SC_NPROCESSORS_ONLN);
return nc;
#endif