[mvapich-discuss] Bunch and Scatter CPU Binding policy

[vaibhav dutt]

Hi,

The  MVAPICH2 user guide (
http://mvapich.cse.ohio-state.edu/support/mvapich2-1.7_user_guide.pdf)
provides
the examples with figures for bunch and scatter CPU binding policies in
case block rank placement  is used. I was wondering
what would be the case for bunch and scatter policies, when cyclic rank
placement is used. Can anybody help me with this.

Block rank placement ( For a 4 node cluster, each node having 8 cores)

Node 0 - Rank 0 to 7
Node 1-  Rank 8 to 15
Node 3-  Rank 16 to 23
Node 4- Rank 24 to 31


Cyclic Rank Placement

Node 0 - Ranks 0,4,8,12,16,20,24,28
Node 1- Ranks 1,5,9,13,17,21,25,29
Node 2- Ranks 2,6,10,14,18,22,26,30
Node 3- Ranks 3,7,11,15,19,23,27,31

Thanks
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