Details
Blocker Description
Merging files in 6.20 and 6.22 implies a much higher memory usage than in 6.18. This is a serious problem for CMS production, e.g. when it comes to merge monitoring histograms. This is a standalone reproducer by Marcel Schneider which runs out of the box on lxplus: https://gist.github.com/dpiparo/ac89c4303e622b1b307c6d6c04013cf0
source /cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.18.00/x86_64-centos7-gcc48-opt/bin/thisroot.sh
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root -b -q repro.C
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echo 6.18 res memory = 1879.34 Mbytes
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source /cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.20.00/x86_64-centos7-gcc48-opt/bin/thisroot.sh
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root -b -q repro.C
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echo 6.20 res memory = 2951.23 Mbytes
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source /cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.22.00/x86_64-centos7-gcc48-opt/bin/thisroot.sh
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root -b -q repro.C
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echo 6.22 res memory = 2966.5 Mbytes
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