[mpich-discuss] Thank you for your help

[Dmitriy Lyubimov]

Hello,

 I am new to MPI. I have a couple of questions I hope someone could help me
with -- i tried to scan archives but have not immediately found the
answers.

(1) I know there is a multicast based implementation for infiniband in a
derivative MVAPICH peojwxr from Ohio state that apparently allows to avoid
packet duplication for multiple addressees when implementing broadcasts and
scatters, in a reliable communication manner even for larger messages (as
large as perhaps 16...200Mb)

Is there any similar technique used in MPICH for broadcasts and gathers?
Would there be any networking benefit in using MPICH as opposed to
carefully organized point-to-point broadcast scheme such as perhaps chained
peer-to-peer or butterfly mixing?

(2) Another question is possibility of integration of the worker processes
with another resource manager (other than Hydra, i guess) -- perhaps yarn
or mesos. Can i bring the worker process first somehow and then enroll it
into a communicator, assuming at certain point i know all process locations
in the network?

In other words, can i replace whatever mpirun or mpiexec does, with a
custom code that would enroll all workers into the communicators and
assigns the ranks?

(3) network multinenancy: can i set up several world communicators on the
same network independently at different point of times? or it has to be
only one world communicator at a time?

Thank you very much for your help.
-Dmitriy
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