Ubuntu Manpage: ptsematest - Start two threads and measure the latency of interprocess communication with POSIX mutex.

NAME

       ptsematest - Start two threads and measure the latency of interprocess communication with POSIX mutex.

SYNOPSIS

       ptsematest  [-a|--affinity  [PROC]]  [-b|--breaktrace  USEC]  [-d|--distance  DIST]  [-D|--duration TIME]
       [-h|--help] [-i|--interval INTV] [--json  FILENAME]  [-l|--loops  LOOPS]  [-p|--prio  PRIO]  [-q|--quiet]
       [-S|--smp] [-t|--threads [NUM]]

DESCRIPTION

       The      program      ptsematest     starts     two     threads     that     are     synchronized     via
       pthread_mutex_unlock()/pthread_mutex_lock() and measures the latency between releasing  and  getting  the
       lock.

OPTIONS

-a, --affinity[=PROC]
Run on processor number PROC. If PROC is not specified, run on current processor.

-b, --breaktrace=USEC
Send break trace command when latency > USEC. This is a debugging option to control the latency
tracer in the realtime preemption patch. It is useful to track down unexpected large latencies of
a system.

-d, --distance=DIST
Set the distance of thread intervals in microseconds (default is 500 us). When cyclictest is
called with the -t option and more than one thread is created, then this distance value is added
to the interval of the threads: Interval(thread N) = Interval(thread N-1) + DIST

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

-h, --help
Print help message.

-i, --interval=INTV
Set the base interval of the thread(s) in microseconds (default is 1000 us). This sets the
interval of the first thread. See also -d.

--json=FILENAME
Write final results into FILENAME, JSON formatted.

-l, --loops=LOOPS
Set the number of loops. The default is 0 (endless). This option is useful for automated tests
with a given number of test cycles. ptsematest is stopped once the number of timer intervals has
been reached.

-p, --prio=PRIO
Set the priority of the process.

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

-S, --smp
SMP testing: options -a -t and same priority

-t, --threads[=NUM]
Set the number of test threads (default is 1, if this option is not given). If NUM is specified,
create NUM test threads. If NUM is not specified, NUM is set to the number of available CPUs.

EXAMPLES

       The following example was running on a 4-way processor:

       # ptsematest -a -t -p99 -i100 -d25 -l1000000
       #0: ID8672, P99, CPU0, I100; #1: ID8673, P99, CPU0, Cycles 1000000
       #2: ID8674, P98, CPU1, I125; #3: ID8675, P98, CPU1, Cycles 811035
       #4: ID8676, P97, CPU2, I150; #5: ID8677, P97, CPU2, Cycles 668130
       #6: ID8678, P96, CPU3, I175; #7: ID8679, P96, CPU3, Cycles 589423
       #1 -> #0, Min    1, Cur    1, Avg    2, Max   11
       #3 -> #2, Min    1, Cur    2, Avg    2, Max   13
       #5 -> #4, Min    1, Cur    4, Avg    3, Max   12
       #7 -> #6, Min    1, Cur    4, Avg    2, Max   12

AUTHORS