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Special Forums News, Links, Events and Announcements Software Releases - RSS News Portable Linux Processor Affinity 1.1 (Default branch)
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Old 02-22-2008
Portable Linux Processor Affinity 1.1 (Default branch)
PLPA is an attempt to solve the problem ofmultiple API's for processor affinity withinLinux. Specifically, the functionssched_setaffinity() and sched_getaffinity() havenumbers and types of parameters depending on yourLinux vendor and/or version of GLibc. This isquite problematic for applications attempting touse processor affinity in Linux for compile-time,link-time, and run-time reasons. The PLPA providesa single processor affinity API that developerscan write to in order to get both consistentbehavior and binary compatibility across differentLinux installations (assuming that you have anexecutable that is otherwise binary Linux portable).License: BSD License (revised)Changes:
The ability to understand (socket,core) tuples forspecific process placement was added, as opposedto just specifying Linux virtual processor IDs.The plpa-taskset executable was also added, whichunderstands the same command line syntax as the"taskset" command, but also understands(core@socket) nomenclature.Image

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LEARN ABOUT OSF1

pinfo

psrinfo(1)						      General Commands Manual							psrinfo(1)

NAME

       psrinfo, pinfo - Displays processor administration information

SYNOPSIS

       /usr/sbin/psrinfo -n

       /usr/sbin/psrinfo [-v] [processor...]

       /usr/sbin/psrinfo -s  processor

       /usr/sbin/pinfo [-v] [processor...]

OPTIONS

       Displays  the  number  of  processors in the system.  Enables verbose mode.  Writes only a boolean value to standard output.  The -s option
       requires a single processor identification number (processor).  The -s option is intended to be used in scripts.  A value of 1 is output if
       the specified processor is on line.  A value of 0 is output if the specified processor is off line.

DESCRIPTION

       The psrinfo and pinfo commands display information about processors.  The processor variable specifies the processor identification number,
       which is a unique integer that identifies the processor.  If you do not specify any options or a processor identification number, the  com-
       mands display information about all processors.

EXAMPLES

       The following is an example of the default prsinfo command output (no options or processor identification numbers):

	      greene:>	psrinfo  0	  on-line    since 11/03/1999 09:41:34 1       on-line	 since 11/03/1999 09:41:34 2	   off-line  since
	      11/03/1999 08:41:34

	      The following example shows how to use the psrinfo command with the -s option in a shell script to determine the state of  the  pro-
	      cessor with an identification number of 1:

	      if  [ "`psrinfo -s 1 2> /dev/null`" -eq 1 ] then	    echo "processor 1 is up" else      echo "processor 1 is down" fi The following
	      example shows how to use the psrinfo command with the -v option:

	      % psrinfo -v Status of processor 0 as of: 05/23/00 15:47:40
		Processor has been on-line since 05/23/2000 15:08:04
		The alpha EV5.6 (21164A) processor operates at 465 MHz,
		      and has an alpha internal floating point processor.  Status of processor 1 as of: 05/23/00 15:47:40
		Processor has been on-line since 05/23/2000 15:08:04
		The alpha EV5.6 (21164A) processor operates at 465 MHz,
		      and has an alpha internal floating point processor.  Status of processor 2 as of: 05/23/00 15:47:40
		Processor has been off-line since 05/23/2000 15:08:04
		The alpha EV5.6 (21164A) processor operates at 465 MHz,
		      and has an alpha internal floating point processor.  Status of processor 3 as of: 05/23/00 15:47:40
		Processor has been on-line since 05/23/2000 15:14:00
		The alpha EV5.6 (21164A) processor operates at 465 MHz,
		      and has an alpha internal floating point processor.

FILES

SEE ALSO

       Commands:  pset_assign_cpu(1), pset_assign_pid(1), pset_info(1), psradm(8)

       Files:  utmp(4)

       Processor Sets:	processor_sets(4)

																	psrinfo(1)