NAME

       smem - Report memory usage with shared memory divided proportionally.

SYNOPSIS

       smem [options]

DESCRIPTION

       smem  reports  physical  memory  usage, taking shared memory pages into account.  Unshared
       memory is reported as the USS (Unique Set Size).  Shared memory is  divided  evenly  among
       the  processes sharing that memory.  The unshared memory (USS) plus a process's proportion
       of shared memory is reported as the PSS (Proportional Set Size).  The  USS  and  PSS  only
       include  physical  memory  usage.  They do not include memory that has been swapped out to
       disk.

       Memory can be reported by process, by user, by mapping, or systemwide.  Both text mode and
       graphical output are available.

OPTIONS

   GENERAL OPTIONS
       -h, --help
              Show help.

   SOURCE DATA
       By  default,  smem  will  pull  most of the data it needs from the /proc filesystem of the
       system it is running on.  The --source option lets you used a tarred  set  of  /proc  data
       saved  earlier,  possibly  on a different machine.  The --kernel and --realmem options let
       you specify a couple things that smem cannot discover on its own.

       -K KERNEL, --kernel=KERNEL
              Path to an uncompressed kernel image.  This lets  smem  include  the  size  of  the
              kernel's  code  and  statically  allocated data in the systemwide (-w) output.  (To
              obtain an uncompressed image of a kernel on disk, you may need to build the  kernel
              yourself, then locate file vmlinux in the source tree.)

       -R REALMEM, --realmem=REALMEM
              Amount  of  physical  RAM.   This  lets  smem  detect  the amount of memory used by
              firmware/hardware in the systemwide (-w) output.  If provided, it will also be used
              as the total memory size to base percentages on.  Example: --realmem=1024M

       -S SOURCE, --source=SOURCE
              /proc  data  source.   This lets you specify an alternate source of the /proc data.
              For example, you can capture data from an embedded system using smemcap, and  parse
              the  data  later  on  a different machine.  If the --source option is not included,
              smem reports memory usage on the running system.

   REPORT BY
       If none of the following options are included, smem reports memory usage by process.

       -m, --mappings
              Report memory usage by mapping.

       -u, --users
              Report memory usage by user.

       -w, --system
              Report systemwide memory usage summary.

   FILTER BY
       If none of these options are included, memory usage is reported for all processes,  users,
       or  mappings.   (Note: If you are running as a non-root user, and if you are not using the
       --source options, then you will only see data from processes whose /proc/ information  you
       have access to.)

       -M MAPFILTER, --mapfilter=MAPFILTER
              Mapping filter regular expression.

       -P PROCESSFILTER, --processfilter=PROCESSFILTER
              Process filter regular expression.

       -U USERFILTER, --userfilter=USERFILTER
              User filter regular expression.

   OUTPUT FORMATTING
       -a, --autosize
              Size columns to fit terminal size.

       -c COLUMNS, --columns=COLUMNS
              Columns to show.

       -H, --no-header
              Disable header line.

       -k, --abbreviate
              Show unit suffixes.

       -n, --numeric
              Show numeric user IDs instead of usernames.

       -p, --percent
              Show percentages.

       -r, --reverse
              Reverse sort.

       -s SORT, --sort=SORT
              Field to sort on.

       -t, --totals
              Show totals.

   OUTPUT TYPE
       These options specify graphical output styles.

       --bar=BAR
              Show bar graph.

       --pie=PIE
              Show pie graph.

REQUIREMENTS

       smem requires:

       ·  Linux kernel providing 'Pss' metric in /proc/<pid>/smaps (generally 2.6.27 or newer).

       ·  Python 2.x (at least 2.4 or so).

       ·  The matplotlib library (only if you want to generate graphical charts).

EMBEDDED USAGE

       To  capture  memory  statistics  on  resource-constrained systems, the the smemcap package
       includes a utility named smemcap.  smemcap captures all /proc entries required by smem and
       outputs  them  as  an uncompressed .tar file to STDOUT.  smem can analyze the output using
       the --source option.  smemcap is small and does not require Python.

       To use smemcap:

       1.     Install package smemcap on target system.

       2.     Run smemcap on the target system and save the output:
              smemcap > memorycapture.tar

       3.     Copy the output to another machine and run smem on it:
              smem -S memorycapture.tar

FILES

       /proc/$pid/cmdline

       /proc/$pid/smaps

       /proc/$pid/stat

       /proc/meminfo

       /proc/version

RESOURCES

       Main Web Site: http://www.selenic.com/smem

       Source code repository: http://selenic.com/repo/smem

       Mailing list: http://selenic.com/mailman/listinfo/smem

SEE ALSO

       free(1), pmap(1), proc(5), ps(1), top(1), vmstat(8)

COPYING

       Copyright (C) 2008-2009 Matt Mackall.  Free use of this  software  is  granted  under  the
       terms of the GNU General Public License version 2 or later.

AUTHOR

       smem was written by Matt Mackall.

                                            03/15/2010                                    SMEM(8)