[openib-general] MPI error when using a "system" call in mpi job.

[glebn at voltaire.com]

On Wed, Jun 14, 2006 at 09:59:58AM -0700, Ira Weiny wrote:
> We are on a modified RedHat RHEL4 kernel.  Roughly 2.6.9.  :-(
> 
This is known problen with kernel 2.6.9.

> I am going to try a 2.6.16 kernel I have built to see if it changes.
> 
This will work with system(), but not with fork().

> Ira
> 
> 
> On Wed, 14 Jun 2006 09:04:48 -0400
> Sayantan Sur <surs at cse.ohio-state.edu> wrote:
> 
> > Hello Ira,
> > 
> > I am running the program on 2.6.15 (EM64T machine) and 2.6.16 (IA32 
> > machine). The program seems to be running fine. Can you tell us which 
> > kernel you are using? We are using drivers pulled out of the trunk
> > about 3-4 weeks back.
> > 
> > Thanks,
> > Sayantan.
> > 
> > Ira Weiny wrote:
> > 
> > >A co-worker here was seeing the following MPI error from his job:
> > >
> > >[1] Abort: [ldev2:1] Got completion with error, code=1
> > > at line 2148 in file viacheck.c
> > >
> > >After some tracking down he found that apparently if he used a
> > >"system" call [int system(const char *string)] the next MPI command
> > >will fail.
> > >
> > >I have been able to reproduce this with the attached simple "hello"
> > >program.
> > >
> > >Perhaps someone has seen this type of error?  Here is the output
> > >from 2 runs:
> > >
> > >weiny2 at ldev0:~/ior-test
> > >17:04:04 > mpirun_rsh -rsh -hostfile hostfile -np 2 ./hello x
> > >ldev1
> > >[0] Abort: [ldev1:0] Got completion with error, code=1
> > > at line 2148 in file viacheck.c
> > >ldev2
> > >mpirun_rsh: Abort signaled from [0]
> > >done.
> > >weiny2 at ldev0:~/ior-test
> > >17:05:23 > mpirun_rsh -rsh -hostfile hostfile -np 2 ./hello
> > >now = 0.000000
> > >now = 0.000052
> > >now = 0.000094
> > >now = 0.000121
> > >now = 0.000151
> > >now = 0.001072
> > >now = 0.001102
> > >now = 0.001118
> > >now = 0.001141
> > >now = 0.001160
> > >done.
> > >
> > >We are running mvapich 0.9.7 and the openib trunk rev 6829.
> > >
> > >Thanks,
> > >Ira
> > >
> > >  
> > >
> > >------------------------------------------------------------------------
> > >
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> > >
> > 
> > -- 
> > http://www.cse.ohio-state.edu/~surs
> > 
> 
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--
			Gleb.