[FLASH-USERS] Need help solving cross-node operations

[Reyes, Adam]

This seems like an mpi environment configuration issue unrelated to FLASH. Openmpi cannot see 112 hardware cores and so you get the first error message. Oversubscribing 112 processes to whatever it can see is probably not what you want to do.

Does a simple mpi hello world program (or some other mpi program) run without issues using the same command?
*********************************************
Adam Reyes


Code Group Leader, Flash Center for Computational Science  
Research Scientist, Dept. of Physics and Astronomy
University of Rochester
River Campus: Bausch and Lomb Hall, 369  
500 Wilson Blvd. PO Box 270171, Rochester, NY 14627
Email adam.reyes at rochester.edu
Web https://flash.rochester.edu
 (he / him / his)


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> On Sep 10, 2024, at 11:17 AM, 史路林 <shilulin at impcas.ac.cn> wrote:
> 
> Dear Flash users,
> 
> 
> I'm a new user of FLASH. At present, when using the server computing program, it is found that mpich or Openmpi is running mpirun -np 112 ./flash4 (the server has 56 CPUs per node, and each CPU can provide 1 thread), the following error message will occur:
> 
> <1725959518289.png>
> 
> Is there a way to solve the problem of cross-node operations? Thank you！
> 
> Also, I've tweaked the process with the prompted command (--oversubscribe) and the result is the following error：
> 
> <1725959802421.png>
> 
> Looking forward to hearing from you！
> 
> Thank you！
> 
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> 
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> https://flash.rochester.edu/mailman/listinfo/flash-users

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