Migrating Sas To Power7 - IBM Power7 Optimization And Tuning Manual

Our findings were that, on POWER7 and AIX V6.1, you can achieve equal or better
performance for the 18 queries in parallel, if you allocate +1 virtual processors to the target
dedicated cores and:
Give the IQ LPAR slightly higher entitlement than its neighbors
or
Give the IQ LPAR a higher weight setting than its neighbors
or
Arrange the shared pool so that neighbor LPARs have lower peak demand
The reason for allocating +1 virtual processor in relation to the target dedicated CPU count is
that the shared processor allocation algorithm is continually recalculating load and thus
averages down
processors and sustain a 100% load, the actual consumption is about 3.9 processors on
average. Thus, to attain a peak allocation of the power of four processors, five virtual
processors must be assigned, and so on.
You can achieve equal or better performance of each query that is run sequentially by using
the configurations that are outlined in "Implementing Sybase IQ to POWER7" on page 195)
and by turning off virtual processor
standard practice, but it leads to improved performance in some cases.
Finally, our results suggest that IQ 15.2 can attain dedicated-level performance with a 1:4
entitlement to virtual processor ratio, providing that the other configuration suggestions
are followed.

Migrating SAS to POWER7

This section provides a starting point for performance optimization from a system-wide
perspective to create an enhanced environment for SAS 9 on IBM POWER processor-based
servers that run AIX V6.1 and AIX V7.1. To verify that the version of SAS and the product
suites you are running are supported at the version of AIX you are running, review the
information found at:
http://support.sas.com/resources/sysreq/hosts/unix/
The preferred performance settings are as follows:
Technology levels: Use the latest version of AIX V7 (currently Version 7.1) with the latest
maintenance levels and fix packs, or AIX 6 V6.1. For more information, go to:
http://www.ibm.com/support/fixcentral
As of the publication of this guide, Version 7.1 TL01 with fix pack or Version 6.1 TL07 are
considered to be the latest technology levels with fix packs.
IBM HMC: Keep the HMC and microcode up to date.
– Search for HMC update bulletins and microcode at:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
– VMM: Both the AIX V6.1 and AIX V7.1 default VMM parameters are mostly tuned for
optimal SAS performance, except for one parameter. If needed, you can change the
other values by using the AIX vmo command. Start with the following parameter values:
• nokilluid=10.
• minfree=use greater of 960 or (128 * number of logical processors).
slightly from the number of virtual processors. Thus, if you allocate four virtual
folding
Appendix C. POWER7 optimization and tuning with third-party applications
. Turning off virtual processor folding is not
197