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Full Discussion: Interpreting Linux's free command output
Top Forums UNIX for Beginners Questions & Answers Interpreting Linux's free command output Post 303011498 by MadeInGermany on Friday 19th of January 2018 03:38:13 AM
Old 01-19-2018
The difference is the speed.
It takes a second to clear the 5GB buffers&cache.
If there is high concurrent I/O it takes a minute.
In the second scenario the filling of 8 GB of RAM happens faster (or much faster).

There is a difference between filling (actual usage) and requesting. Linux serves RAM requests immediately without checking if this is really available, "unlimited overcommitment". For example a java application that claims 25 GB RAM will start, and later crash when it fills it with data.

In contrast, Solaris 10 has "limited overcommitment". For example only commits up to twice the available RAM; a java application that claims 25 GB RAM will only start when there is >13 GB available.
 

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LEARN ABOUT DEBIAN

laptop_mode

LAPTOP_MODE(8)						      System Manager's Manual						    LAPTOP_MODE(8)

NAME

       /usr/sbin/laptop_mode - apply laptop mode settings

SYNOPSIS

       /usr/sbin/laptop_mode [ cmd ] [ force ]

DESCRIPTION

       This  manual  page  documents  briefly  the  /usr/sbin/laptop_mode command. laptop_mode is a program that applies the settings given in the
       /etc/laptop-mode/laptop-mode.conf configuration file. The primary use is to control the laptop mode feature included in Linux kernels  with
       versions  2.6.6	and  higher,  and  2.4.23  and	higher.  This feature increases battery life by letting your hard drive spin down. This is
       achieved by grouping disk write activity into "chunks" that are spaced at larger intervals than they normally would be. In addition to sup-
       porting	the  Linux  kernel's  laptop  mode  feature, /usr/sbin/laptop_mode also supports various power saving modules which are configured
       through configuration files in the /etc/laptop-mode/conf.d directory.

       It is not recommended to call /usr/sbin/laptop_mode directly to start or stop laptop mode, except in hardware event handlers. To apply  new
       configuration settings from laptop-mode.conf, call the laptop-mode service init script with the reload parameter.

COMMANDS

       Specify force as the second parameter to force laptop_mode to re-apply a state even if the computer is already in that state. These are the
       values that are allowed for cmd :

       auto	 Enable or disable laptop mode based on the current power state. Note that this will not do anything if  the  laptop-mode  service
		 has not been started!

       status	 Display a status report about everything that laptop_mode affects.

SEE ALSO

       laptop-mode.conf(8).

AUTHOR

       This  manual  page was written by Bart Samwel (bart@samwel.tk) for the Debian system (but may be used by others).  Permission is granted to
       copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later  version  published	by
       the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.

																    LAPTOP_MODE(8)
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