Provided by: cputool_0.0.8-2_i386 bug


       cputool — CPUTool is a utility which manages CPU usage and system load


       cputool [--cpu-limit PCNT]  [--load-limit LOAD]  [ [--pid PID  | --pid-
       pgrp PID ]  |  [--]  COMMAND ...  ]


       Limit the CPU usage of a process or a process group to  a  given  limit
       and/or  suspend  processes  if  the  system  load  exceeds a threshold.
       CPUTool works by sending  SIGSTOP  and  SIGCONT  signals  to  processes
       depending on the system load.


       These  programs  follow  the  usual  GNU command line syntax, with long
       options starting with two  dashes  (`-').   A  summary  of  options  is
       included below.

       -c, --cpu-limit PCNT
                 Specify  the  maxium CPU the process / process group can use.
                 Expressed as percentage of total CPU. Eg.  200  is  two  full
                 CPUs in a multi processor system. Specify an integer value.

       -l, --load-limit LOAD
                 Specify  the  maxium  load  the system may experience for the
                 process  process  group  to  continue  running.  Specifyng  a
                 fractional value is possible (e.g. 3.5).

       -p, --pid PID
                 Manage  the  CPU  usage  of  a specific PID. This is the most
                 efficient use of CPUTool as it does  not  have  to  walk  the
                 process tree to look for forks of children.

       -P, --pid-pgrp PID
                 Manage  the  CPU  usage  of  a  specific PID's entire process
                 group. The same can be achieved by specifying a COMMAND which
                 CPUTool  will  then  execute  and  manage  the  process group
                 created by that command.

       -v, --verbose
                 Increase the amount of messages printed to stderr.

                 -vv will additionally show statistical information.

                 -vvv will addditionally show signals being sent to processes.

       -V, --version
                 Output version information and exit.

       -h, --help
                 Display a help page and exit.


       CPUTool will run on 32-bit and 64-bit Linux systems. It depends on  the
       /proc pseudo-filesystem to detect PIDs and their resource usage.

       TCP  network  connections  could time out if a process is suspended for
       extended periods of time  (while  the  load  is  too  high).   Not  all
       programs handle this case well.


       cputool -p 4711 -c 75
                 Limit the PID 4711 to 75% use of one CPU core.

       cputool -l 7.5 -- rsync -av /home /backup/`date +%Y-%m-%d`/
                 Run  rsync  for a local backup only when the system load does
                 not exceed 7.5. See the note for -l when using  program  that
                 relies on TCP network connections.


       signals (7), kill(1), uptime(1).


       This  manual  page was written by Daniel Lange and converted to SGML by
       Nigel  Kukard  <>.  Permission  is  granted  to   copy,
       distribute  and/or  modify  this  document  under  the terms of the GNU
       General Public License, Version 3 any later version  published  by  the
       Free Software Foundation.

       On  Debian systems, the complete text of the GNU General Public License
       can be found in /usr/share/common-licenses/GPL-3.