Date
Attendees
Serge Monkewitz, Andy Salnikov, Andy Hanushevsky, Brian Van Klaveren, Fritz Mueller, Unknown User (npease), Vaikunth Thukral. John Gates, Unknown User (kelsey), Jacek Becla
Kian-Tat Lim for shared scans discussions
Discussion items
Logging
- see description of DM-4616 - Getting issue details... STATUS
New crash observed
- kernel panic on workers, triggered by deadlock on czar. Worker code run in docker containers
- Looks like docker-related networking issue
- Rerun test on bare-metal without containers to confirm it is docker issue
Profiling code
- things to consider / look at:
- gprof (for cpu), problems with profiling shared library / have to do static builds, old fashioned
- valgrind (for memory)
- qprof
- profiler written for CMS by Peter Elmer
- oprofile
- perftools
- Might be able to leverage xswap
Shared scans
- planning to implement simple resource manager, plug it into existing shared scan code (written by Daniel / rewritten by John)
- AndyH will review John's existing code
We want to send all queries for a given chunk to the same copy of that chunk (e.g., "primary")
See DM-4617 - Getting issue details... STATUS
Next Qserv meeting
- Due to slac-lsst holiday lunch next Wednesday, next week Qserv meeting rescheduled to Tuesday 12-3:30pm pacific