Dahai,
You are right the segfault is unexpected. I can't replicate this on my mac.
What architecture are you seeing this issue ? How was your OMPI compiled ?
Please post the output of ompi_info.
Thanks,
George.
On Thu, May 4, 2017 at 5:42 PM, Dahai Guo <dahai....@gmail.com> wrote:
> 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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>>
>>
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>
>
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