Megalinux

When compiling varnishtop (and other tools) on RHEL/CentOS 5, I came across the following issue:

varnishtop.o: In function `do_curses':
/tmp/varnish-2.1.4/bin/varnishtop/varnishtop.c:223: undefined reference to `initscr'
/tmp/varnish-2.1.4/bin/varnishtop/varnishtop.c:224: undefined reference to `raw'
/tmp/varnish-2.1.4/bin/varnishtop/varnishtop.c:225: undefined reference to `noecho'
/tmp/varnish-2.1.4/bin/varnishtop/varnishtop.c:226: undefined reference to `nonl'
/tmp/varnish-2.1.4/bin/varnishtop/varnishtop.c:227: undefined reference to `stdscr'
......
......
collect2: ld returned 1 exit status
make: *** [varnishtop] Error 1


The issue seems to be with the ncurses library that comes with the standard distribution. So, I installed the ncurses-5.7 libs from source, using:
./configure --with-shared --with-debug --enable-overwrite --with-termlib

and then recompiling/building varnish/varnishtop.

Finding Physical Processors:
$ grep 'physical id' /proc/cpuinfo | sort | uniq | wc -l

Finding Virtual Processors
$ grep ^processor /proc/cpuinfo | wc -l

Finding CPU cores
$ grep 'cpu cores' /proc/cpuinfo

“2″ indicates the two physical processors are dual-core, resulting in 4 virtual processors.
If “1″ was returned, the two physical processors are single-core.

If the processors are single-core, and the number of virtual processors is greater than the number of physical processors, the CPUs are using hyper-threading.

Finding CPU Arch
$ grep flags /proc/cpuinfo | uniq | egrep -o -w "rm|tm|lm"

Under “Flags” section in /proc/cpuinfo, you will find any of the flags “tm” or
“rm” or “lm”

• rm (Real Mode) means it is a 16 bit processor
• tm (Transparent Mode) means it is a 32 bit processor
• lm (Long Mode) means it is a 64 bit processor


RewriteEngine on
RewriteCond %{HTTP_HOST} !^www.your_domain.com$
RewriteRule ^(.*)$ http://www.your_domain.com/$1 [R=301]


Piwik(http://piwik.org/) is open source self-hostable web analytics tool (like omniture or  google analytics). To integrate piwik with mediawiki, I customized the existing Google Analytics mediawiki plugin (http://www.mediawiki.org/wiki/Extension:Google_Analytics_Integration) to work with piwik. To include the extension in your wiki,
unzip the file, and deploy the piwik.php extension file into WIKI_INSTALL_DIR/extensions/. Then include the file in your LocalSettings.php, using:

require_once("extensions/piwik.php");


Download piwik extension