[mvapich-discuss] MVAPICH 2-GDR Issue with MPI_Allreduce

[Herten, Andreas]

Dear all,

I’ve tested the minimal producer with MVAPICH-GDR 2.2.3 on our JUWELS machine. In general, it looks better, but it is still not functioning properly.
I updated my write-up from last time with a section on MVAPICH-GDR 2.2.3 at the bottom:
	https://urldefense.com/v3/__https://gist.github.com/AndiH/b929b50b4c8d25137e0bfee25db63791*experiments-with-mvapich-233-gdr__;Iw!!KGKeukY!jaIM8xGNoJNXTxq-u_4wPlPIS_K01CYcFquAMtrI83yCeLDmwxwLo1dP0Sd3WROp5xPuon4_kve6nG8$ 

Best,

-Andreas
—
NVIDIA Application Lab
Jülich Supercomputing Centre
Forschungszentrum Jülich, Germany
+49 2461 61 1825

> Am 08.01.2020 um 11:33 schrieb Herten, Andreas <a.herten at fz-juelich.de>:
> 
> Dear MV2 Support,
> 
> We see an issue when calling MPI_Allreduce on GPU memory buffers. The reduction produces wrong results or the program even seg faults.
> I wrote up a more detailed description including a minimal reproducing example and some of our experiments here:
> 	https://urldefense.com/v3/__https://gist.github.com/AndiH/b929b50b4c8d25137e0bfee25db63791__;!!KGKeukY!jaIM8xGNoJNXTxq-u_4wPlPIS_K01CYcFquAMtrI83yCeLDmwxwLo1dP0Sd3WROp5xPuon4_9RBsC4I$  <https://urldefense.com/v3/__https://gist.github.com/AndiH/b929b50b4c8d25137e0bfee25db63791__;!!KGKeukY!jaIM8xGNoJNXTxq-u_4wPlPIS_K01CYcFquAMtrI83yCeLDmwxwLo1dP0Sd3WROp5xPuon4_9RBsC4I$ >
> 
> Is this a bug?
> 
> New year’s greetings,
> 
> -Andreas
> —
> NVIDIA Application Lab
> Jülich Supercomputing Centre
> Forschungszentrum Jülich, Germany
> +49 2461 61 1825
> 

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