Hi Kshitij,
On 5/24/2012 4:32 PM, Kshitij Mehta wrote:
Hello,
I am just learning to use HDF5 , and I have a question on how to use the
mpiposix driver.
Attached herewith is a simple mpi program where each process does the following:
open hdf file;
write data into a 2x2 dataset;
close file;
re-open file;
read dataset back;
I ran this with 2 processes and h5dump of the file shows that the file only
contains data from the first process. I dont see data from the second process.
I suspect I am not somehow specifying the property lists correctly. Can someone
point out what I am doing wrong?
The property list setting is fine, but you are creating 1 dataset, and
having two processes write to the same dataset (over each other).. So in
your case, process 1 data is overwriting process 2's data.. If you delay
process 1 a little before the write call, using sleep for example, you
will read back process's 1 data from both processes.
Probably what you want is create n datasets, and have each process write
to each dataset?
or create 1 4xn, or nx4 dataset and have each process select a portion
of the dataset to write and read from?
Thanks,
Mohamad
Thanks,
Kshitij Mehta
PhD Candidate
Parallel Software Technologies Lab
University of Houston
Texas, USA
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_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
