Synchronization Variable Storage Post: 302572019

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Top Forums Programming Synchronization Variable Storage Post 302572019 by Praveen_218 on Wednesday 9th of November 2011 02:36:50 AM

11-09-2011

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They are just variables (ofcourse the pthread lib treat them specially) so where ever you declare/define them there they’d appear; the only thing is their scope and visibility to pthreads that should guide you the location to declare them.

Like to add a quick-tip:
You can look at the process (having pid = x) memory area at /proc/<pid>/maps

Code:

cat /proc/x/maps

Gives you all *.so and other memory area of the process (in terms of memory ranges).

If you have to see the location of a perticular variable; just print it's address from your program and while the process is running, look at the location (find the range slab) where the address is falling. That is the location of your variable in the program. This is true for any address your program uses.

Thanks.

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migratepages

MIGRATEPAGES(8) 					   Linux Administrator's Manual 					   MIGRATEPAGES(8)

NAME

       migratepages - Migrate the physical location a processes pages

SYNOPSIS

       migratepages pid from-nodes to-nodes

DESCRIPTION

       migratepages  moves  the physical location of a processes pages without any changes of the virtual address space of the process. Moving the
       pages allows one to change the distances of a process to its memory. Performance may be optimized by moving a processes pages to  the  node
       where it is executing.

       If  multiple  nodes are specified for from-nodes or to-nodes then an attempt is made to preserve the relative location of each page in each
       nodeset.

       For example if we move from nodes 2-5 to 7,9,12-13 then the preferred mode of operation is to move pages from 2->7, 3->9, 4->12 and  5->13.
       However, this is only posssible if enough memory is available.

       Valid node specifiers

	      all		  All nodes
	      number		  Node number
	      number1{,number2}   Node number1 and Node number2
	      number1-number2	  Nodes from number1 to number2
	      ! nodes		  Invert selection of the following specification.

NOTES

       Requires an NUMA policy aware kernel with support for page migration (linux 2.6.16 and later).

       migratepages will only move pages that are not shared with other processes if called by a user without administrative priviledges (but with
       the right to modify the process).

       migratepages will move all pages if invoked from root (or a user with administrative priviledges).

FILES

       /proc/<pid>/numa_maps for information about the NUMA memory use of a process.

COPYRIGHT

       Copyright 2005-2006 Christoph Lameter, Silicon Graphics, Inc.  migratepages is under the GNU General Public License, v.2

SEE ALSO

       numactl(8) , set_mempolicy(2) , get_mempolicy(2) , mbind(2) , sched_setaffinity(2) , sched_getaffinity(2) , proc(5) , ftok(3) , shmat(2)  ,
       taskset(1)

SGI
								     Jan 2005							   MIGRATEPAGES(8)