Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

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 listing 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:

   -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@freelists.org



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.



Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.



Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.



Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner