Your company here — click to reach over 10,000 unique daily visitors

signaltest - Man Page

signal roundtrip test software

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


signaltest [ -a|--affinity NUM] [ -b|--backtrace USEC ] [-D|--duration TIME] [-h|--help] [--json FILENAME] [-l|--loops LOOPS ] [-p|--prio PRIO] [-q|--quiet] [-S|--smp] [-t|--threads NUM] [-m|--mlockall ] [-v|--verbose ]


These programs follow the usual GNU command line syntax, with long options starting with two dashes ('--').

-a,  --affinity[=PROC-SET]

Run threads on the set of processors given by PROC-SET.  If PROC-SET is not specified, all processors will be used.  Threads will be assigned to processors in the set in numeric order, in a round-robin fashion.
The set of processors can be specified as A,B,C, or A-C, or A-B,D-F, and so on*. The ! character can be used to negate a set.  For example, !B-D means to use all available CPUs except B through D.  The cpu numbers are the same as shown in the processor field in /proc/cpuinfo.  See numa(3) for more information on specifying CPU sets. * Support for CPU sets requires libnuma version >= 2.  For libnuma v1, PROC-SET, if specified, must be a single CPU number.

-b,  --breaktrace=USEC

Send break trace command when latency > USEC

-D,  --duration=TIME

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


display usage information


Write final results into FILENAME, JSON formatted.

-l,  --loops=LOOPS

Number of loops: default=0 (endless)

-p,  --priority=PRIO

Priority of highest priority thread

-q,  --quiet

print a summary only on exit

-S,  --smp

Set options for standard testing on SMP systems. Equivalent to using the options: "-t -a" as well keeping any specified priority equal across all threads

-t,  --threads=NUM

number of threads: default=2

-m,  --mlockall

lock current and future memory allocations

-v,  --verbose

output values on stdout for statistics
format: n:c:v n=tasknum c=count v=value in us


signaltest was written by Thomas Gleixner <tglx@linuxtronix.de>.

This manual page was originally written by
John Kacur <jkacur@redhat.com>

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.  This file is offered as-is, without any warranty.


November 15, 2020