hwloc-ps (1)

hwloc-ps [options]

-a

list all processes, even those that are not bound to any specific part of the machine.

-p --physical

report OS/physical indexes instead of logical indexes

-l --logical

report logical indexes instead of physical/OS indexes (default)

-c --cpuset

show process bindings as cpusets instead of objects.

-t --threads

show threads inside processes. If -a is given as well, list all threads within each process. Otherwise, show all threads inside each process where at least one thread is bound.

-e --get-last-cpu-location

Report the last processors where the process/thread ran. Note that the result may already be outdated when reported since the operating system may move the tasks to other processors at any time according to the binding.

--whole-system

Do not consider administration limitations.

--pid-cmd <cmd>

Append the output of the given command to each PID line. For each displayed process ID, execute the command <cmd> <pid> and append the first line of its output to the regular hwloc-ps line.

By default, hwloc-ps lists only those currently-running processes that are bound. If -t is given, processes that are not bound but contain at least one bound thread are also displayed, as well as all their threads.

hwloc-ps displays process identifier, command-line and binding. The binding may be reported as objects or cpusets.

By default, process bindings are restricted to the currently available topology. If some processes are bound to processors that are not available to the current process, they are ignored unless --whole-system is given.

The output is a plain list. If you wish to annotate the hierarchical topology with processes so as to see how they are actual distributed on the machine, you might want to use lstopo --ps instead (which also only shows processes that are bound).

The -a switch can be used to show all processes, if desired.

If a process is bound, it appears in the default output:

    $ utils/hwloc-ps
    4759	Core:0		myprogram

If a process is not bound but 3 of his 4 threads are bound, it only appears in the thread-aware output:

    $ utils/hwloc-ps

    $ utils/hwloc-ps -t
    4759	Machine:0		myprogram
     4759	Machine:0
     4761	PU:0
     4762	PU:2
     4765	PU:1

To display the binding of already running MPI processes (launched by Open MPI) and append their MPI rank (in MPI_COMM_WORLD) to each line:

    $ utils/hwloc-ps --pid-cmd myscript
    29093	L1dCache:0	myprogram	OMPI_COMM_WORLD_RANK=0
    29094	L1dCache:2	myprogram	OMPI_COMM_WORLD_RANK=1
    29095	L1dCache:1	myprogram	OMPI_COMM_WORLD_RANK=2
    29096	L1dCache:3	myprogram	OMPI_COMM_WORLD_RANK=3

where myscript is a bash script doing:

    #!/bin/sh
    cat /proc/$1/environ 2>/dev/null | xargs --null --max-args=1 echo | grep OMPI_COMM_WORLD_RANK

hwloc(7), lstopo(1), hwloc-calc(1), hwloc-distrib(1)