MEMSTAT(1)						     Linux Programmer's Manual							MEMSTAT(1)

NAME

       memstat - Identify what's using up virtual memory.

SYNOPSIS

       memstat [-w][-p PID]

DESCRIPTION

       memstat	lists all accessible processes, executables, and shared libraries that are using up virtual memory. To get a complete list memstat
       has to be run as root to be able to access the data of all running processes.

       First, the processes are listed.  An amount of memory is shown along with a process ID and the name of the executable which the process	is
       running.   The  amount  of memory shown does not include shared memory: it only includes memory which is private to that process.  So, if a
       process is using a shared library like libc, the memory used to hold that library is not included.   The  memory  used  to  hold  the  exe-
       cutable's text-segment is also not included, since that too is shareable.

       After  the  processes, the shared objects are listed.  The amount of memory is shown along with the filename of the shared object, followed
       by a list of the processes using the shared object. The memory is listed as the total amount of memory allocated to this object	throughout
       the whole namespace.  In brackets also the amount that is really shared is listed.

       Finally, a grand total is shown.  Note that this program shows the amount of virtual (not real) memory used by the various items.

       memstat	gets  its input from the /proc filesystem.  This must be compiled into your kernel and mounted for memstat to work.  The pathnames
       shown next to the shared objects are determined by scanning the disk.  memstat uses a configuration file, /etc/memstat.conf,  to  determine
       which  directories  to scan.  This file should include all the major bin and lib directories in your system, as well as the /dev directory.
       If you run an executable which is not in one of these directories, it will be listed by memstat as ``[0dev]:<inode>''.

   Options
       The -w switch causes a wide printout: lines are not truncated at 80 columns.

       The -p switch causes memstat to only print data gathered from looking at the process with the gicen PID.

NOTES

       These reports are intended to help identify programs that are using an excessive amount of memory, and to reduce overall memory waste.

FILES

       /etc/memstat.conf
       /proc/*/maps

SEE ALSO

       ps(1), top(1), free(1), vmstat(8), lsof(8), /usr/share/doc/memstat/memstat-tutorial.txt.gz

BUGS

       memstat ignores all devices that just map main memory, though this may cause memstat to ignore some memory usage.

       Memory used by the kernel itself is not listed.

AUTHOR

       Originally written by Joshua Yelon <jyelon@uiuc.edu> and patched by Bernd Eckenfels <ecki@debian.org>. Taken over and rewritten by  Michael
       Meskes <meskes@debian.org>.

Debian								 01 November 1998							MEMSTAT(1)