slabtop(1) - phpMan

SLABTOP(1)                                User Commands                                SLABTOP(1)



NAME
       slabtop - display kernel slab cache information in real time

SYNOPSIS
       slabtop [options]

DESCRIPTION
       slabtop displays detailed kernel slab cache information in real time.  It displays a list-
       ing of the top caches sorted by one of the listed sort criteria.  It also displays a  sta-
       tistics header filled with slab layer information.

OPTIONS
       Normal  invocation of slabtop does not require any options.  The behavior, however, can be
       fine-tuned by specifying one or more of the following flags:

       -d, --delay=N
              Refresh the display every n in seconds.  By default, slabtop refreshes the  display
              every three seconds.  To exit the program, hit q.

       -s, --sort=S
              Sort by S, where S is one of the sort criteria.

       -o, --once
              Display the output once and then exit.

       -V, --version
              Display version information and exit.

       -h, --help
              Display usage information and exit.

SORT CRITERIA
       The  following are valid sort criteria used to sort the individual slab caches and thereby
       determine what are the "top" slab caches to display.  The default sort criteria is to sort
       by the number of objects ("o").

       The  sort criteria can also be changed while slabtop is running by pressing the associated
       character.

       character   description                header
       a           number of active objects   ACTIVE
       b           objects per slab           OBJ/SLAB
       c           cache size                 CACHE SIZE
       l           number of slabs            SLABS
       v           number of active slabs     N/A
       n           name                       NAME
       o           number of objects          OBJS
       p           pages per slab             N/A
       s           object size                OBJ SIZE
       u           cache utilization          USE

COMMANDS
       slabtop accepts keyboard commands from the user during use.  The following are  supported.
       In the case of letters, both cases are accepted.

       Each  of  the valid sort characters are also accepted, to change the sort routine. See the
       section SORT CRITERIA.

       <SPACEBAR>
              Refresh the screen.

       Q      Quit the program.

FILES
       /proc/slabinfo
              slab information

SEE ALSO
       free(1), ps(1), top(1), vmstat(8)

NOTES
       Currently, slabtop requires a 2.4 or later kernel (specifically, a version  1.1  or  later
       /proc/slabinfo).  Kernel 2.2 should be supported in the future.

       The slabtop statistic header is tracking how many bytes of slabs are being used and is not
       a measure of physical memory.  The 'Slab' field in  the  /proc/meminfo  file  is  tracking
       information about used slab physical memory.

AUTHORS
       Written by Chris Rivera and Robert Love.

       slabtop was inspired by Martin Bligh's perl script, vmtop.

REPORTING BUGS
       Please send bug reports to <procps AT freelists.org>



procps-ng                                   June 2011                                  SLABTOP(1)

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