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Introduction
------------
The purpose of idlestat is to measure how long we have been in the different
idle and operating states.
Idlestat uses kernel's FTRACE function to monitor and capture C-state and
P-state transitions of CPUs over a time interval. It extracts the following
information from trace file:
- Times when CPUs entered and exited a certain C-state
- Times when CPUs entered and exited a certain P-state
- Raised IRQs
Following a successful run, idlestat calculates and reports the following
information:
- Total, average, minimum and maximum time spent in each C-state,
per-CPU.
- Total, average, minimum and maximum time spent in each P-state,
per-CPU.
- Total, average, minimum and maximum time during which all CPUs in
a cluster were in the same C-state, per-cluster.
- Number of times a certain IRQ caused a CPU to exit idle state,
per-CPU and per-IRQ
Requirements
------------
1. It must be run as root in order to access /sys/kernel/debug.
2. It requires tracing to be enabled in the kernel
Help
----
./idlestat -h will show all the options
Example Usage
-------------
Trace mode:
sudo ./idlestat --trace -f /tmp/myoutput -t 10
Reporing mode (/tmp/mytrace already contains traces):
sudo ./idlestat --import -f /tmp/mytrace
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