[mvapich-discuss] mpi_allgather performance at high core counts question

[Howard Pritchard]

Hello Mvapich users,

I'd be curious to know if any unusual performance problems have
been observed with the mpich2 mpi_allgather algorithm for small
data sizes/rank (for example 8 bytes per rank) at high core counts.

For example, have any performance issused been observed on the TAC machine
using mvapich2 at say 10000 ranks or so?

Thanks for any info,

Howard

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Howard Pritchard 
Cray Inc.