Opened 16 years ago
Closed 15 years ago
#237 closed Bug (fixed)
Undefined behaviour writing to ocean.output from multiple pes
| Reported by: | a.osprey@… | Owned by: | nemo |
|---|---|---|---|
| Priority: | normal | Milestone: | |
| Component: | OCE | Version: | v2 |
| Severity: | Keywords: | ||
| Cc: |
Description
I have been running version 2.3 NEMO on a Cray XT4 (www.hector.ac.uk) with pathscale and PGI compilers.
I have found that when running on multiple processors with pathscale most of the text sent to ocean.output is lost, although it seems OK for PGI. I believe the problem is with multiple pes writing to a single file. I think that in pathscale the text from each pe overwrites the previous one entirely, so in the end we only see output from one pe (usually not the useful one.)
I don't think there is any standard behaviour for multiple pes writing to a single file (although I suppose some compilers handle it OK), so I suggest that only one pe (the one where lwp=.TRUE.) writes to ocean.output.
I have attached a "quick fix" which I have tested with revision 1164 for both pathscale and PGI. In opa.F90 ocean.output is opened and the header text written after lwp is set. In in_out_manager.F90 numout is initialised to stdout by default so that no output is lost if any of the other pes try to write to numout.
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Change History (3)
Changed 16 years ago by nemo_user
Changed 16 years ago by nemo_user
comment:1 Changed 15 years ago by smasson
- Resolution set to fixed
- Status changed from new to closed
done, see changeset:1579 and changeset:1581