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    Command:

    taskset

    
    
    

    SYNOPSIS

           taskset [options] mask command [arg]...
           taskset [options] -p [mask] pid
    
    
    

    DESCRIPTION

           taskset  is  used to set or retrieve the CPU affinity of a running pro-
           cess given its PID or to launch a new COMMAND with a given  CPU  affin-
           ity.   CPU affinity is a scheduler property that "bonds" a process to a
           given set of CPUs on the system.  The Linux scheduler  will  honor  the
           given  CPU  affinity  and  the  process will not run on any other CPUs.
           Note that the Linux scheduler also supports natural CPU  affinity:  the
           scheduler attempts to keep processes on the same CPU as long as practi-
           cal for performance reasons.  Therefore, forcing a specific CPU  affin-
           ity is useful only in certain applications.
    
           The CPU affinity is represented as a bitmask, with the lowest order bit
           corresponding to the first logical CPU and the highest order bit corre-
           sponding  to  the  last logical CPU.  Not all CPUs may exist on a given
           system but a mask may specify more CPUs than are present.  A  retrieved
           mask  will  reflect only the bits that correspond to CPUs physically on
           the system.  If an invalid mask is given (i.e., one that corresponds to
           no  valid  CPUs on the current system) an error is returned.  The masks
           are typically given in hexadecimal.  For example,
    
           0x00000001
                  is processor #0
    
           0x00000003
                  is processors #0 and #1
    
           0xFFFFFFFF
                  is all processors (#0 through #31)
    
           When taskset returns, it is guaranteed that the given program has  been
           scheduled to a legal CPU.
    
    
    

    OPTIONS

           -p, --pid
                  operate on an existing PID and not launch a new task
    
           -c, --cpu-list
                  specify  a  numerical  list  of processors instead of a bitmask.
                  The list may contain multiple items,  separated  by  comma,  and
                  ranges.  For example, 0,5,7,9-11.
    
           -h, --help
                  display usage information and exit
    
           -V, --version
                  output version information and exit
    
    
    

    USAGE

           mask of any process.
    
    
    

    AUTHOR

           Written by Robert M. Love.
    
    
    

    COPYRIGHT

           Copyright (C) 2004 Robert M. Love
           This is free software; see the source for copying conditions.  There is
           NO  warranty;  not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
           PURPOSE.
    
    
    

    SEE ALSO

           chrt(1), nice(1), renice(1), sched_setaffinity(2), sched_getaffinity(2)
    
           See  sched_setscheduler(2)  for  a  description of the Linux scheduling
           scheme.
    
    
    

    AVAILABILITY

           The taskset command is part of the util-linux-ng package and is  avail-
           able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
    
    
    

    schedutils Apr 2003 TASKSET(1)

    
    
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