[mvapich-discuss] How far can mvapich go?

[Dhabaleswar Panda]

> How many tasks can mvapich-1.0 support on a job, with MPD, on-demand
> or without MPD?

A new scalable and high performance start-up procedure (mpirun_rsh)  has
been added to mvapich-1.0. Several installations have used this start-up
procedure to run `tens of thousands' of tasks. You should use this
start-up procedure and should not see any limitation on very large-scale
systems.

>   Why does't slurm support the mvapich with MPD?

There is a support for slurm with mvapich. Several production
installations also use mvapich with slurm. Please refer to the section 5.3
in mvapich 1.0 user guide about how to use this support:

http://mvapich.cse.ohio-state.edu/support/mvapich_user_guide.html#x1-220005.3

>   How many connections can a task keep with others if based on IBCM?

RDMA_CM is the latest connection management with the Open Fabrics stack.
If you are interested to use this connection management, you should use
MVAPICH2 (instead of MVAPICH). MVAPICH2 has more advanced and latest
features than MVAPICH.

>   How far can mvapich go?

As indicated above, applications are being run with mvapich on tens of
thousands of cores.

Hope this helps.

DK

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