HWLOC-PS(1) hwloc HWLOC-PS(1)NAMEhwloc-ps - List currently-running processes or threads that are bound
SYNOPSIShwloc-ps [options]
OPTIONS-a list all processes, even those that are not bound to any spe‐
cific 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Note that the result may already be outdated when reported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 pro‐
cessors 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.
DESCRIPTION
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 avail‐
able 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.
EXAMPLES
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
SEE ALSOhwloc(7), lstopo(1), hwloc-calc(1), hwloc-distrib(1)1.11.1 Oct 15, 2015 HWLOC-PS(1)
