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The turbostat tool provides detailed information about the amount of time that the system spends in different states. Turbostat is provided by the kernel-tools package.
By default, turbostat prints a summary of counter results for the entire system, followed by counter results every 5 seconds, under the following headings:
- The processor package number.
- The processor core number.
- The Linux CPU (logical processor) number.
- The percentage of the interval for which the CPU retired instructions.
- When this number is higher than the value in TSC, the CPU is in turbo mode
- The average clock speed over the course of the entire interval.
- %c1, %c3, and %c6
- The percentage of the interval for which the processor was in the c1, c3, or c6 state, respectively.
- %pc3 or %pc6
- The percentage of the interval for which the processor was in the pc3 or pc6 state, respectively.
Specify a different period between counter results with the
-ioption, for example, run
turbostat -i 10to print results every 10 seconds instead.
Upcoming Intel processors may add additional c-states. As of Red Hat Enterprise Linux 7.0, turbostat provides support for the c7, c8, c9, and c10 states.