Date

09 Dec 2015

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 

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 

Next Qserv meeting

• Due to slac-lsst holiday lunch next Wednesday, next week Qserv meeting rescheduled to Tuesday 12-3:30pm pacific