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.