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KB43172: How to find the number of Physical CPUs on AIX OS?


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Guidance on how to determine the number of physical CPUs at are available for a AIX OS

There are situations in which it is requested to know how many CPUs are in a system for different reasons, for instance for being able to create an associated Strategy license key.
For IBM AIX operating system, Strategy handles the CPU based on resource sets (rset). These bind the specific physical processor to the named process. Due to the new terminolgy used by the manufacturer for new processor series concepts may be confused:
POWER 7 has multiple cores (4, 6, 8) and each core has 4 "threads" or register files. These register files can also be used simultaneously if the compiler can arrange for the threads to only use certain processing functions in isolation.
POWER 6 is a dual core processor only, but has features to allow for very rapid context (thread) switching, and so allows for the appearance of many logical units (called logical partitions or LPARs)
In AIX there are many commands that show resource sets, cores or threads as processors, but the following command can be used to determine the Physical Processors (CPUs). Please note this command is provided "as is" and for your convenience only:

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For more information on how to configure the license for AIX, see the section "Implementation considerations on AIX" on TN: 10122
Third Party Software Installation WARNING
The third-party product(s) discussed in this technical note is manufactured by vendors independent of Strategy. Strategy makes no warranty, express, implied or otherwise, regarding this product, including its performance or reliability.
 
 


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Knowledge Article

Published:

April 10, 2017

Last Updated:

April 10, 2017