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[H5part] Discussion on H5Part/Block/Fed write on a subset of the MPI_COMM_WORLD space


Chronological Thread 
  • From: Andreas Adelmann <andreas.adelmann AT psi.ch>
  • To: h5part AT lists.psi.ch
  • Cc: Andreas Adelmann <Andreas.Adelmann AT psi.ch>
  • Subject: [H5part] Discussion on H5Part/Block/Fed write on a subset of the MPI_COMM_WORLD space
  • Date: Tue, 07 Jul 2009 13:57:58 +0200
  • List-archive: <https://lists.web.psi.ch/pipermail/h5part/>
  • List-id: H5Part development and discussion <h5part.lists.psi.ch>

Collegues I would like to start/continue the discussion we had over lunch.


Because of performance reasons, a partial write w.r.t. to a subset of the mpi cores
would be very attractive.

Example: the cores 1 ... 3 are writing to the H5 file
while the codes 4 ... 7 are sending the data to core 1 and so on,
as shown below.


H5-FILE --------- 0 0
0 0
----------
^ ^ ^
| | |
writing 1 2 3

sending 4 5 6 7 -> 1
8 9 10 11 -> 2
12 13 14 15 -> 3


Question: can we start H5 with a subset of MPI_COMM_WORLD (core 1,2,3 in the example above) ?

Andreas

--
Dr. sc. math. Andreas (Andy) Adelmann
Staff Scientist
Paul Scherrer Institut WBGB/132 CH-5232 Villigen PSI
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  • [H5part] Discussion on H5Part/Block/Fed write on a subset of the MPI_COMM_WORLD space, Andreas Adelmann, 07/07/2009

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