In freebsd-questions Digest, Vol 300, Issue 11, Message: 8
On Fri, 5 Mar 2010 16:58:20 -0600 Dan Nelson dnel...@allantgroup.com wrote:
In the last episode (Mar 05), Peter Steele said:
What's the proper way to calculate kernel/user/idle time? I know the raw
values come from sysctl
What's the proper way to calculate kernel/user/idle time? I know the raw values
come from sysctl kern.cp_time, but these values need to be massaged based on
the number of CPUs and so on. Can someone explain briefly what the algorithm is
calculating the final percentages representing these
In the last episode (Mar 05), Peter Steele said:
What's the proper way to calculate kernel/user/idle time? I know the raw
values come from sysctl kern.cp_time, but these values need to be
massaged based on the number of CPUs and so on. Can someone explain
briefly what the algorithm is
They shouldn't need to be massaged. Just sample the values at two intervals,
and your percentages can be calculated by dividing
each delta by the sum of the deltas (since the sum equals the total CPU usage
over the interval, by definition). If you want to
calculate per-cpu usage, use the
