December 2011
Intermediate to advanced
426 pages
13h 30m
English
book
Power Systems Enterprise Servers with PowerVM Virtualization and RAS
by Dino Quintero, JinHoon Baek, Guillermo Diez, Hassan Elsetohy, Debra Francis, Bing He, Rajesh Jeyapaul, Anil Kalavakolanu, Tejaswini Kaujalgi, David Kgabo, Ricardo Puig, Vani Ramagiri
Content preview from Power Systems Enterprise Servers with PowerVM Virtualization and RAS
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Chapter 7. POWER7 Enterprise Server performance considerations 309
Example 7-15 shows the output after switching SMT mode from 2 to single thread
(smtctl -t 1). The same program is running on logical cpu4, and it consumes the entire
capacity of a processor because there are no other hardware threads available to execute
code.
Example 7-15 CPU utilization when single-thread process is running with ST (single thread) mode
# sar -P ALL 2 10
System configuration: lcpu=2 mode=Capped
17:47:29 cpu %usr %sys %wio %idle
17:47:31 0 0 1 0 99
4 100 0 0 0
- 50 1 0 50
If you want to learn more about processor utilization on Power Systems, refer to the IBM ...
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