Problems reading HDF5 files with IntelMPI?

de_Vicente__Angel — Mon, 27 Oct 2014 16:36:49 GMT

Hi,

is anyone aware of troubles with PHDF5 and IntelMPI? A test code to
reads an HDF5 file in parallel has trouble when scaling if I run it with
IntelMPI, but no trouble if I run it, for example, with POE.

I'm using Intel compilers 13.0.1, IntelMPI 4.1.3.049, and HDF5 1.8.10

The code just reads a 800x800x800 HDF5 file, and the times I get for
reading it are:

128 procs - 0.7262E+01
1024 procs - 0.9815E+01
1280 procs - 0.9930E+01
1600 procs - ??????? (it gest stalled...)

But the same code (compiled with the above modules), but submitted with
IBM's POE instead of IntelMPI has no trouble with 1600 procs (actually
no trouble at all with up to 4096 procs) and it reads the file in
0.8963E+01 secs.

Any help appreciated,

topic Problems reading HDF5 files with IntelMPI? in Intel® MPI Library

Problems reading HDF5 files with IntelMPI?