Re: [Users] meeting minutes for 2017-03-13

Steve was there, too.

--Steve

On 03/13/2017 10:10 AM, Roland Haas wrote:

Present: Frank, Eloisa, Roland, Peter, Jonah, Erik, Vassili, Bhavesh, Ian

Roland asked about overlap of communication and computation during SYNC statements.

• communication buffers are all data between pairs of processors
• multi-threaded MPI may be required to keep a thread inside of MPI all the time for systems where MPI does no work unless a caller is inside its code. Could use self-compiled OpenMPI on blue waters or multi-threaded Cray MPI.
• suggestions to use mpi trace
• stand-alone test may be best
• need to determine that there is actually a benefit of this overlap

Piraha parser:

• currently stop parsing a CCL file at the first CCL syntax error but will parse multiple files for errors.
• since syntax errors in piraha include things like mis-spelling CCTK_REAL Roland thinks that aborting at syntax errors is bad also since typically one will modify only a single CCL files when eg working on a thorn
• this is however larger than the original intent of the ticket, which was about some specific files not parsing
• Roland will provide a set of ccl files that should parse but do not parse

testsuite problems:

• see issues on Nebula Haswel
• see issues on Roland's laptop Kaby Lake
• see issues on Ian's laptop/workstation (Kaby lake)

Workshop this year:

• no date set yet

Yours, Roland

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