Library /sys$common/syshlp/PCA$HELP.HLB  —  SET  VPC_SAMPLING, Qualifiers

1    /INTERVAL 

       /INTERVAL:n

    Specifies the sampling interval in milliseconds. The value of
    n must be at the least 10 milliseconds and at the most 60,000
    milliseconds. Because the granularity of the system clock is 10
    milliseconds, use a multiple of 10. The default sampling interval
    is 10 milliseconds; therefore, you can use the /INTERVAL:n
    qualifier only to specify a longer sampling interval.

2    /STACK_PCS 

    Specifies that stack PC values for vector PC data are to be
    collected. The /STACK_PCS qualifier is the default upon entry
    into the Collector.

3    /NOSTACK_PCS 

    Specifies that stack PC values for vector PC data are not to be
    collected. If you specify /NOSTACK_PCS, further SET VPC_SAMPLING
    requests assume a default of /NOSTACK_PCS.
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