slabtop(1) - phpMan

SLABTOP(1)                             Linux User's Manual                             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
       statistics 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:

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

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

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

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

       --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.

       a:     sort by number of active objects

       b:     sort by objects per slab

       c:     sort by cache size

       l:     sort by number of slabs

       v      sort by number of active slabs

       n:     sort by name

       o:     sort by number of objects

       p:     sort by pages per slab

       s:     sort by object size

       u:     sort by cache utilization


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 it 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.  The procps package is main-
       tained by Albert Cahalan <albert AT users.net>.

       Please send bug reports to <procps-feedback AT lists.net>.



Linux                                      13 Sep 2003                                 SLABTOP(1)

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