cset-proc - Online in the Cloud

PROGRAM:

NAME

cset-proc - manage processes running in cpusets

SYNOPSIS

cset [cset options] proc [proc options] [args]
cset proc --help
cset proc
cset proc my_set my_other_set
cset proc --list --set my_set
cset proc --exec my_set /opt/software/my_code --my_opt_1
cset proc --set my_set --exec /opt/software/my_code --my_opt_1
cset proc --move 2442,3000-3200 my_set
cset proc --move --pid=2442,3000-3200 --toset=my_set
cset proc --move --fromset=my_set_1 --toset=my_set_2
cset proc --move --pid=42 --fromset=/group1/myset --toset=/group2/yourset

OPTIONS

-h, --help
prints the list of options for this command

-l, --list
list processes in the specified cpuset

-e, --exec
execute arguments in the specified cpuset

-u USER, --user=USER
use this USER to --exec (id or name)

-g GROUP, --group=GROUP
use this GROUP to --exec (id or name)

-m, --move
move specified tasks to specified cpuset; to move a PIDSPEC to a cpuset, use -m
PIDSPEC cpuset; to move all tasks specify --fromset and --toset

-p PIDSPEC, --pid=PIDSPEC
specify pid or tid specification

--threads
if specified, any processes found in the PIDSPEC to have multiple threads will
automatically have all their threads added to the PIDSPEC (use to move all related
threads to a cpuset)

-s CPUSET, --set=CPUSET
specify name of immediate cpuset

-t TOSET, --toset=TOSET
specify name of destination cpuset

-f FROMSET, --fromset=FROMSET
specify name of origination cpuset

-k, --kthread
move, or include moving, unbound kernel threads

--force
force all processes and threads to be moved

-v, --verbose
prints more detailed output, additive

DESCRIPTION

This command is used to run and manage arbitrary processes on specified cpusets. It is
also used to move pre-existing processes and threads to specified cpusets. You may note
there is no "kill" or "destroy" option — use the standard OS ^C or kill commands for that.

To list which tasks are running in a particular cpuset, use the --list command.

For example:

# cset proc --list --set myset

This command will list all the tasks running in the cpuset called "myset".

Processes are created by specifying the path to the executable and specifying the cpuset
that the process is to be created in.

For example:

# cset proc --set=blazing_cpuset --exec /usr/bin/fast_code

This command will execute the /usr/bin/fast_code program on the "blazing_cpuset" cpuset.

Note that if your command takes options, then use the traditional "--" marker to separate
cset’s options from your command’s options.

For example:

# cset proc --set myset --exec — ls -l

This command will execute "ls -l" on the cpuset called "myset".

The PIDSPEC argument taken for the move command is a comma separated list of PIDs or TIDs.
The list can also include brackets of PIDs or TIDs (i.e. tasks) that are inclusive of the
endpoints.

For example:

1,2,5 Means processes 1, 2 and 5
1,2,600-700 Means processes 1, 2 and from 600 to 700

Note
The range of PIDs or TIDs does not need to have every position populated. In other
words, for the example above, if there is only one process, say PID 57, in the range
of 50-65, then only that process will be moved.
To move a PIDSPEC to a specific cpuset, you can either specify the PIDSPEC with --pid and
the destination cpuset with --toset, or use the short hand and list the cpuset name after
the PIDSPEC for the --move arguments.

The move command accepts multiple common calling methods. For example, the following
commands are equivalent:

# cset proc --move 2442,3000-3200 reserved_set

# cset proc --move --pid=2442,3000-3200 --toset=reserved_set

These commands move the tasks defined as 2442 and any running task between 3000 and 3200
inclusive of the ends to the cpuset called "reserved_set".

Specifying the --fromset is not necessary since the tasks will be moved to the destination
cpuset no matter which cpuset they are currently running on.

Note
However, if you do specify a cpuset with the --fromset option, then only those tasks
that are both in the PIDSPEC and are running in the cpuset specified by --fromset will
be moved. I.e., if there is a task running on the system but not in --fromset that is
in PIDSPEC, it will not be moved.
If the --threads switch is used, then the proc command will gather any threads of
belonging to any processes or threads that are specified in the PIDSPEC and move them.
This provides an easy way to move all related threads: just pick one TID from the set and
use the --threads option.

To move all userspace tasks from one cpuset to another, you need to specify the source and
destination cpuset by name.

For example:

# cset proc --move --fromset=comp1 --toset=comp42

This command specifies that all processes and threads running on cpuset "comp1" be moved
to cpuset "comp42".

Note
This move command will not move kernel threads unless the -k/--kthread switch is
specified. If it is, then all unbound kernel threads will be added to the move.
Unbound kernel threads are those that can run on any CPU. If you also specify the
--force switch, then all tasks, kernel or not, bound or not, will be moved.

Caution
Please be cautious with the --force switch, since moving a kernel thread that is bound
to a specific CPU to a cpuset that does not include that CPU can cause a system hang.
You must specify unique cpuset names for the both exec and move commands. If a simple name
passed to the --fromset, --toset and --set parameters is unique on the system then that
command executes. However, if there are multiple cpusets by that name, then you will need
to specify which one you mean with a full path rooted at the base cpuset tree.

For example, suppose you have the following cpuset tree:

/cpusets
/group1
/myset
/yourset
/group2
/myset
/yourset

Then, to move a process from myset in group1 to yourset in group2, you would have to issue
the following command:

# cset proc --move --pid=50 --fromset=/group1/myset --toset=/group2/yourset

You do not have to worry about where in the Linux filesystem the cpuset filesystem is
mounted. The cset command takes care of that. Any cpusets that are specified by path (such
as above), are done with respect to the root of the cpuset filesystem.

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