cyclicdeadline - Man Page

This program is used to test the deadline scheduler (SCHED_DEADLINE) using a cyclictest style program

# SPDX-License-Identifier: GPL-2.0-only


cyclicdeadline [-a [CPUSET]] [-D TIME] [-h]  [-i INTV] [--json FILENAME] [-s STEP] [-t NUM] [-q]


cyclicdeadline is a cyclictest style program for testing the deadline scheduler


-a --affinity [CPUSET]

Comma / hypen separated list of CPUs to run deadline tasks on

-D --duration TIME

Specify a length for the test to run Append 'm', 'h', or 'd' to specify minutes, hours, or days

-h --help

Show this help menu

-i --interval INTV

The shortest deadline for the tasks in us. (default 1000us)


Write final results into FILENAME, JSON formatted.

-s --step STEP

The amount to increase the deadline for each task in us. (default 500us)

-t --threads NUM

The number of threads to run as deadline (default 1)

-q,  --quiet

Print a summary only on exit. Useful for automated tests, where only the summary output needs to be captured.

-b,  --breaktrace=USEC

Send break trace command when latency > USEC


write a trace mark when -b latency is exceeded.


cyclicdeadline was written by Steven Rostedt <>

This manual page was written by John Kacur <>


January 16, 2020