Hi Rob,
Robert Latham wrote:
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?
One process (so far) talking to a 3 node pvfs2 fs. I can perform
several tens of successful sessions of
open file type A, read close open file type A write close
open file type B, read close open file type B write close
before the crash in an open. But the crash happens at
a different "session number" every time. To make this clear,
I just ran the app 12 times in a row. Here is the result
Failed Session # file type op
32 B open
37 A open
39 B open
40 B open
41 B open
42 B open
45 A open
45 B open
after a several minutes pause
50 A open
after a while more
52 A open
53 B open
56 A open
After a crash, the open leaves a zero length file with the
correct name in the pvfs2 directory, as verified by pvfs2-ls.
I open read ops with the mode MPI::MODE_RDONLY, and open
write ops with the mode MPI::MODE_WRONLY | MPI::MODE_CREATE.
1, 2, and 3 processes work correctly doing MPI-IO to a single
local xfs file.
are you opening the file with MPI_COMM_SELF, or using a larger
communicator?
No difference between MPI_COMM_WORLD and MPI_COMM_SELF.
Thanks,
Russell
==rob
--
Russell L. Carter
Esturion, LLC
2285 Sandia Drive
Prescott, Arizona 86301
[EMAIL PROTECTED]
928 308-4154
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