Those messages are what I like to see. But, there are some other error
messages and core dump I don't like, as I attached in my previous email. I
think something might be wrong with errhandler in openmpi. Similar thing
happened for Bcast, etc
Dahai
On Thu, May 4, 2017 at 4:32 PM, Nathan Hjelm <hje...@me.com> wrote:
> By default MPI errors are fatal and abort. The error message says it all:
>
> *** An error occurred in MPI_Reduce
> *** reported by process [3645440001 <(364)%20544-0001>,0]
> *** on communicator MPI_COMM_WORLD
> *** MPI_ERR_COUNT: invalid count argument
> *** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
> *** and potentially your MPI job)
>
> If you want different behavior you have to change the default error
> handler on the communicator using MPI_Comm_set_errhandler. You can set it
> to MPI_ERRORS_RETURN and check the error code or you can create your own
> function. See MPI 3.1 Chapter 8.
>
> -Nathan
>
> On May 04, 2017, at 02:58 PM, Dahai Guo <dahai....@gmail.com> wrote:
>
> Hi,
>
> Using opemi 2.1, the following code resulted in the core dump, although
> only a simple error msg was expected. Any idea what is wrong? It seemed
> related the errhandler somewhere.
>
>
> D.G.
>
>
> *** An error occurred in MPI_Reduce
> *** reported by process [3645440001 <(364)%20544-0001>,0]
> *** on communicator MPI_COMM_WORLD
> ***
> *MPI_ERR_COUNT: invalid count argument* *** MPI_ERRORS_ARE_FATAL
> (processes in this communicator will now abort,
> *** and potentially your MPI job)
> ......
>
> [1,1]<stderr>:1000151c0000-1000151e0000 rw-p 00000000 00:00 0
> [1,1]<stderr>:1000151e0000-100015250000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015250000-100015270000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015270000-1000152e0000 rw-p 00000000 00:00 0
> [1,1]<stderr>:1000152e0000-100015300000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015300000-100015510000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015510000-100015530000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015530000-100015740000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015740000-100015760000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015760000-100015970000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015970000-100015990000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015990000-100015ba0000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015ba0000-100015bc0000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015bc0000-100015dd0000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015dd0000-100015df0000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100015df0000-100016000000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100016000000-100016020000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100016020000-100016230000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100016230000-100016250000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100016250000-100016460000 rw-p 00000000 00:00 0
> [1,1]<stderr>:100016460000-100016470000 rw-p 00000000 00:00 0
> [1,1]<stderr>:3fffd4630000-3fffd46c0000 rw-p 00000000 00:00
> 0 [stack]
> ------------------------------------------------------------
> --------------
>
> #include <stdlib.h>
> #include <stdio.h>
> #include <mpi.h>
> int main(int argc, char** argv)
> {
>
> int r[1], s[1];
> MPI_Init(&argc,&argv);
>
> s[0] = 1;
> r[0] = -1;
> MPI_Reduce(s,r,*-1*,MPI_INT,MPI_SUM,0,MPI_COMM_WORLD);
> printf("%d\n",r[0]);
> MPI_Finalize();
> }
>
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