#! /bin/bash
# Reset the counters
echo "0" > /proc/timer_stats
echo "1" > /proc/timer_stats
# For a 1000 Hz kernel and for 40% probability of issue:
# Apply a 6 percent load at 100 hertz for 20 seconds
# taskset -c 5 /home/doug/c/consume 6.0 100.0 20.0 &
#
# Or, and also for 1000 Hz kernel and for 40% probability of issue:
# Apply a 30 percent load at 500 hertz for 20 seconds.
taskset -c 5 /home/doug/c/consume 30.0 500.0 20.0 &
#
# For a 250 Hz kernel and for 40% probability of issue:
# Apply a 30 percent load at 125 hertz for 20 seconds
# taskset -c 5 /home/doug/c/consume 30.0 125.0 20.0 &
#
# Or just do the math and create your own senario.
#
# taskset -c 5 /home/doug/c/consume ??.? ???.? 20.0 &

# wait until somewhere in the middle of things
sleep 10
# What is the CPU 5 frequency?
echo -n "CPU 5 frequency (~ at or near minimum means forced low due to excessive timer deferral, ~~higher means O.K.): "
cat /sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_cur_freq
# wait until after consume has finished.
sleep 11
# Now observe the timer counters
cat /proc/timer_stats | grep intel
# And turn off timer stats.
echo "0" > /proc/timer_stats