Cacti + MRTG + Nagios Post: 302496941

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Special Forums UNIX and Linux Applications Infrastructure Monitoring Cacti + MRTG + Nagios Post 302496941 by cjcox on Tuesday 15th of February 2011 07:51:36 PM

02-15-2011

Registered User

hmmm... I don't see why Nagios can't do it.... again, our preference for Cacti has to do with they way it works and handles its interface and the maturity of the community it has.

Real time reporting usually means you're looking for something with a heavy handed poller.... which is NOT recommended. You can get very good "real time" information from controlled interval polling and that's what most these kinds of tools do.

The basically generate interval plots... not "live" data per se.

Since computer people like car analogies.... consider "miles per gallon" for a car. If I want instantaneous real time data for that... how is it possible? Well.. we could measure now and a microsecond from now... but with a small window, one sampling might show 400 mpg and the next sample might show me 1 mpg. The tools that use rrd-tool (and rrd-tool itself), understand the difficulties with such data which is why they work the way they do.

In other words it's not the right tool if you're looking for what is happening THAT VERY INSTANT.... IMHO of course.

cjcox

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pgmtoy4m

pgmtoy4m(1)							MJPEG tools manual						       pgmtoy4m(1)

NAME

       pgmtoy4m - Convert mpeg2dec pgm and pgmpipe output to YUV4MPEG2

SYNOPSIS

       pgmtoy4m [options]

DESCRIPTION

       pgmtoy4m  repacks the PGM output from mpeg2dec into YUV4MPEG2 4:2:0p.	No actual changes to the data are made.  The data is unpacked from
       the quasi-PGM format and placed in YUV4MPEG2 format with the specified sample aspect, frame rate and field order.  Output must be either to
       a pipe or a file, leaving stdout as a terminal will elicit an error and the program will exit.

OPTIONS

       pgmtoy4m accepts the following options:

       -v num
	    Set verbosity level.  (default: 0)

       -h   Print a usage summary and exit.

       -i t|b|p
	    Set the interlacing mode.  Top field first (t), bottom field first (b) or progressive/none (p).  (default: t)

       -a sar
	    Set the sample aspect ratio.  (default: 10:11)

       -r frame rate
	    Set the frame rate.  (default: 30000:1001)

EXAMPLES

       mpeg2dec -s -o pgmpipe file.mpg | pgmtoy4m -a 10:11 -r 24000:1001 -i b | yuvplay

       mpeg2dec -s -o pgm file.mpg
       cat *.pgm | pgmtoy4m -r 30000:1001 -i t | yuvplay

NOTES

       This program is specifically designed to work with the output of mpeg2dec and is NOT a general PGM (NetPBM) tool!

       From the introduction in the source file:

	* Note: mpeg2dec uses a variation of the PGM format - they're really not
	* "Grey Maps" but rather a catenation of the 420P data (commonly called
	* "YUV").    The type is P5 ("raw") and the number of rows is really
	* the total of the Y', Cb and Cr heights.   The Cb and Cr data is "joined"
	* together.  After the Y' rows you have 1 row of Cb and 1 row of Cr per
	* "row" of PGM data.

	* NOTE: You MAY need to know the field order (top/bottom field first),
	*      sample aspect ratio and frame rate because the PGM format makes
	*      none of that information available!

AUTHOR

       This manpage was written by Steven Schultz (sms at 2bsd dot com).

BUGS

       Possible but none known at the present time.

MJPEG Linux Square						 16 December 2003						       pgmtoy4m(1)