AIX:  Variable SMTP mode

Posted on 2015-02-02
Medium Priority
Last Modified: 2015-02-02
I understand there is a mode in AIX in which the OS can detect the optimal number of threads,and vary the SMTP accordingly

What is this called.  How do I perform that .

Is this the default behavior

Question by:Anthony Lucia
1 Comment
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Accepted Solution

woolmilkporc earned 2000 total points
ID: 40584604
With POWER8 CPUs AIX will dynamically adjust between SMT and ST (single thread)  mode based on the workload utilization.
There is nothing you must do.

On POWER7(+) processors there is a feature called Scaled Throughput mode.  In this mode, more or all SMT threads on a given core or Virtual Processor will be utilised before dispatching workload to other VPs/cores.

You can enable this with

schedo –o vpm_throughput_mode=n

There are five modes 0-4 for "n".
Use "schedo -h vpm_throughput_mode" to learn more.
Quote: "A higher value will result in fewer cores being unfolded for a given workload".

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