Can you confirm - are you -really- using 1.1.2???
You might consider updating to something more recent, like 1.3.0 or at
least 1.2.8. It would be interesting to know if you see the same
problem.
On Feb 15, 2009, at 3:27 PM, Brian Austin wrote:
Hi,
When I use MPI_File_write_ordered to overwrite an existing file, the
new file is not truncated to the appropriate size.
For example, if I first create a new file and write "aa" from two
nodes, the file contains "aaaa".
Then I close the file, and compute for a while.
Later, I reopen the file with amode=CREATE | WRONLY and write "b"
from two nodes, the file contains "bbaa".
I would have expected the file to contain only "bb".
Am I misunderstanding something, or is this a bug?
Now that I think about it, this seems more like a problem with
MPI_File_Open:
this is the behavior I would have expected if I had reopened the
file with amode=CREATE | RDRW.
Shouldn't MPI_File_Open truncate the file to 0 when it is opened
WRONLY and not APPEND?
I'm able to obtain my desired result by calling
MPI_File_get_position_shared()
MPI_File_set_size()
Thanks
-Brian
PS. I'm using (Open MPI) 1.1.2
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