Main Page/Meeting Notes

This page records meeting notes about NekCEM.

Notes

02/17/2011, Misun, Jing Fu

• Paper
  • will keep iterating the NekCEM I/O paper in accordance to review/feedback from ICS
  • Chris suggest PPAM (submit: 4/30, notify: 6/15) over ICPP and Cluster
  • Results on Jaguar is going to take a while (allocation application turnaround time, compile NekCEM on Cray machines, tune performance, summarize results in paper)
  • Results from Jaguar/Lustre can go into follow-up journal paper (most likely by the end of summer)

• hybrid model
  • I/O w/ pthread is coming along on SMP machines, will try Intrepid soon
  • OpenMP should expect strong support (according to Bronis etc.), will likely be used for computation frame
  • pthread should be acceptable for I/O tasks
  • MPI task?
  • test sub-communicator collective performance degradation (for potential total comm split)
    • for all_reduce, going through subcomm would force routine go torus rather than collective tree network, causing a 10x-30x performance drop for double and integer all_reduce, compared to on MPI_COMM_WORLD; tested on 32k and 64k

• summer time frame
  • Flexible, Misun only absent July 26-29