pi_stress - a stress test for POSIX Priority Inheritance mutexes
] [-g|--groups groups
is a program used to stress the priority-inheritance
code paths for POSIX mutexes, in both the Linux kernel and the C library. It
runs as a realtime-priority task and launches inversion machine
groups. Each inversion group causes a priority inversion
will deadlock if priority inheritance
- -i n|--inversions=n
- Run for n number of inversion conditions. This is
the total number of inversions for all inversion groups. Default is -1 for
- -t n|--duration=n
- Run the test for n seconds and then terminate.
- -g n|--groups=n
- The number of inversion groups to run. Defaults to 10.
- Run in debug mode; lots of extra prints
- Run with verbose messages
- Terminate on receipt of SIGTERM (Ctrl-C). Default is to
terminate on any keypress.
- Run inversion group threads as SCHED_RR (round-robin). The
default is to run the inversion threads as SCHED_FIFO.
- Prompt before actually starting the stress test
- Run all threads on one processor. The default is to run all
inversion group threads on one processor and the admin threads (reporting
thread, keyboard reader, etc.) on a different processor.
- Call mlockall to lock current and future memory allocations
and prevent being paged out
- Display a short help message and options.
The pi_stress test threads run as SCHED_FIFO or SCHED_RR threads, which means
that they can starve critical system threads. It is advisable to change the
scheduling policy of critical system threads to be SCHED_FIFO prior to running
pi_stress and use a priority of 10 or higher, to prevent those threads from
being starved by the stress test.
No documented bugs.
Clark Williams <firstname.lastname@example.org>