Underutilization of Linux memory Post: 303044181

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Operating Systems Linux Underutilization of Linux memory Post 303044181 by Neo on Sunday 16th of February 2020 07:42:42 AM

02-16-2020

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And tomorrow, I will take this dedicated Ubuntu server, currently looks like this (runs MQTT, mysql, apache2 and a number of web sites, does backups, etc):

Code:

top - 06:40:25 up 35 days, 6 min,  1 user,  load average: 0.05, 0.12, 0.16
Tasks: 224 total,   1 running, 223 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.5 us,  0.9 sy,  0.0 ni, 97.5 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 32652952 total, 16986476 free,   694036 used, 14972440 buff/cache
KiB Swap:  7996412 total,  7996412 free,        0 used. 31071156 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                                           
  950 mysql     20   0 2749912 333616  19552 S   0.7  1.0 542:11.32 mysqld                                                                                                            
 8346 www-data  20   0  479644  32704  21104 S   0.7  0.1   0:00.02 apache2                                                                                                           
 8353 www-data  20   0  477684  24696  13064 S   0.7  0.1   0:00.02 apache2                                                                                                           
  901 www-data  20   0  343920  25120   2356 S   0.3  0.1  73:38.94 memcached                                                                                                         
 7461 www-data  20   0  477100  15708   4556 S   0.3  0.0   0:00.05 apache2                                                                                                           
 7607 www-data  20   0  477100  15708   4556 S   0.3  0.0   0:00.03 apache2                                                                                                           
 8205 www-data  20   0  477100  15708   4556 S   0.3  0.0   0:00.01 apache2                                                                                                           
    1 root      20   0  185144   5792   4040 S   0.0  0.0   2:55.18 systemd       
..
...
...
...

Will do the same... will turn off swap complete for a day and compare before and after.

In this manner, everyone can see two very different real-world, live Linux server examples of running with swap on and off; in both cases, there is plenty of memory. In fact, the server in this post (the dedicated server) shows zero swap being used even though the uptime is:

Code:

ubuntu# uptime
 06:44:46 up 35 days, 11 min,  1 user,  load average: 0.31, 0.22, 0.19

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git-instaweb

GIT-INSTAWEB(1) 						    Git Manual							   GIT-INSTAWEB(1)

NAME

       git-instaweb - Instantly browse your working repository in gitweb

SYNOPSIS

       git instaweb [--local] [--httpd=<httpd>] [--port=<port>]
		      [--browser=<browser>]
       git instaweb [--start] [--stop] [--restart]

DESCRIPTION

       A simple script to set up gitweb and a web server for browsing the local repository.

OPTIONS

       -l, --local
	   Only bind the web server to the local IP (127.0.0.1).

       -d, --httpd
	   The HTTP daemon command-line that will be executed. Command-line options may be specified here, and the configuration file will be
	   added at the end of the command-line. Currently apache2, lighttpd, mongoose, plackup and webrick are supported. (Default: lighttpd)

       -m, --module-path
	   The module path (only needed if httpd is Apache). (Default: /usr/lib/apache2/modules)

       -p, --port
	   The port number to bind the httpd to. (Default: 1234)

       -b, --browser
	   The web browser that should be used to view the gitweb page. This will be passed to the git web--browse helper script along with the
	   URL of the gitweb instance. See git-web--browse(1) for more information about this. If the script fails, the URL will be printed to
	   stdout.

       start, --start
	   Start the httpd instance and exit. Regenerate configuration files as necessary for spawning a new instance.

       stop, --stop
	   Stop the httpd instance and exit. This does not generate any of the configuration files for spawning a new instance, nor does it close
	   the browser.

       restart, --restart
	   Restart the httpd instance and exit. Regenerate configuration files as necessary for spawning a new instance.

CONFIGURATION

       You may specify configuration in your .git/config

	   [instaweb]
		   local = true
		   httpd = apache2 -f
		   port = 4321
		   browser = konqueror
		   modulepath = /usr/lib/apache2/modules

       If the configuration variable instaweb.browser is not set, web.browser will be used instead if it is defined. See git-web--browse(1) for
       more information about this.

SEE ALSO

       gitweb(1)

GIT

       Part of the git(1) suite

Git 1.8.3.1							    06/10/2014							   GIT-INSTAWEB(1)

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