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IBM Power Systems 775 for AIX and Linux HPC Solution
book

IBM Power Systems 775 for AIX and Linux HPC Solution

by Dino Quintero, Kerry Bosworth, Puneet Chaudhary, Rodrigo Garcia da Silva, ByungUn Ha, Jose Higino, Marc-Eric Kahle, Tsuyoshi Kamenoue, James Pearson, Mark Perez, Fernando Pizzano, Robert Simon, Kai Sun
October 2012
Intermediate to advanced content levelIntermediate to advanced
358 pages
11h 26m
English
IBM Redbooks
Content preview from IBM Power Systems 775 for AIX and Linux HPC Solution
132 IBM Power Systems 775 for AIX and Linux HPC Solution
Figure 2-13, Node 0 and Node 1 include a CAU and a processor. Node 2 does not have a
CAU and node 3 does not have a processor (uncommon).
Figure 2-13 CAU tree physical connectivity example
Specifying the number of CAU group
The performance of small broadcast and reduction operations is significantly enhanced with
the use of the CAU resources of the HFI. You specify the number of CAU groups for an
application by using the MP_COLLECTIVE_GROUPS environment variable or the
-collective_groups command line flag. Allowable values include any number that is greater
than zero and less than the n
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Publisher Resources

ISBN: 073843731XPurchase book