[Pvfs2-users] problem with MPI-IO

[Robert Latham]

On Thu, May 17, 2007 at 10:28:49AM -0700, Russell L. Carter wrote:
> I can run my single process MPI-IO program just fine
> on a unix fs, but I get segfaults when I run it on the
> pvfs2 fs.  I'm not getting any useful debugging output
> when I run it under mpiexec.  Basically the app
> opens a file, reads it, writes out the data as a new
> file.  It repeats this for 64 files. At some point in
> the process, seemingly random,
> the process crashes on file open, after a significant number of
> reads and writes, such as 33, for example.  

Hi Russell

When you see this crash, are you running with one processor or many?
are you opening the file with MPI_COMM_SELF, or using a larger
communicator?

If you can extract the I/O from the rest of your code, it might be
easier to debug if you can send a testcase.   

==rob

-- 
Rob Latham
Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
Argonne National Lab, IL USA                 B29D F333 664A 4280 315B