Present: The ROOT Team, Marco, Peter, Benedikt, Andreas(R), Andrea (R), Bill (R), Valeri (R)
ACTIONS:
o Alice/LHCb: If time allows provide some indication of the symbols responsible for the memory footprint increase
o LHCb: If time allows, provide the pyROOT example which shows a slowdown wrt ROOT5
o Danilo: provide to Philippe a way to easily reproduce the segfault issue in the cmssw environment
Summary:
o Peter
- Reconstruction of Alice: Performance slightly better in 6
- Results compatible: investigating further since overall compatibility is not enough when it comes to real physics
- Memory allocation: RSS increment seen. Less than 10% overall but at startup non negligible (30%).
- Some 200MB RSS more for reconstruction jobs, some ~70 MB come from the debugging symbols in libCling. To be further investigated
- Valgrind Massif running now to profile memory usage
o Valeri
- Terminate LBL contract: will not continue working on ROOT6
- Track down why reflex-free build failed due this week, the last task
o Marco
- Situation not so bad: Failures are known and being tackled (all reported in JIRA) also by Axel and Danilo
- See also the memory usage increase: tests fail since they are also monitoring deltas of RSS during the run and printing on output if a certain threshold is exceeded.
o Bill
- Fix problems but more coming out, not necessary ROOT issues, but it's like "peeling an onion". Solving issues is in any case (despite the new ones appearing).
- - ~12 issues, but only one is known to be a problem in ROOT itself
- The ROOT related one: compatibility issue ROOT5 files cannot be read with ROOT6: typedefs handled differently. A jira issue will be opened.
o Andreas:
- Relocatability issue fixed
- Not easy to reproduce in a completely standalone environment the intermittent segfault. See actions.
o Andrea:
- The situation is much better with beta2
- Summary on the slides
- Overload resolution of templated methods seem to need c++ exceptions in pyROOT. This is not just the tests, but of the mechanism of resolution.
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