[mrtg] Re: mrtg slow

[McGlinchy, Alistair]

Richard

> I am running mrtg/rrd on the linux/Unix platform. The computer that I 
> have running it, is very slow when implementing mrtg with crontab. I 
> only have 110 lines in crontab and the computer is almost 
> nonrepsonsive. 

You'll need to give a lot more information about what you're doing here.
How many targets are you polling? How what is the spec of your box.
What are the other 109 lines in the crontab (...or are you running 110
different cfg files). Which process(es) and CFG file(s) is/are using the
most CPU or memory.

[For reference I have 11,000 targets running on a 2x1Ghz i586 box with
1GB of RAM @ 300 second polling and have around 70 seconds CPU time
remaining]. 

> I have little experience in writing scripts for Unix/linux, 
> but I would like to write a script and place it in rc I know I have to
have the 
> RunAsDaemon in each config file equal to yes. 

The only performance enhancement you'll get from using RunAsDaemon is
reducing the time required for perl to compile mrtg and parse the .CFG
file.  However if you have 110 distinct CFG files (I have 102 right
now), you may be better off writing a single entry in crontab and call a
general "poll_mrtg_once" script which staggers the cfgs over the 300
seconds.  Here's unixified version of mine <untested>:

Cheers,

Alistair

__CODE__

my $Active_Root  	= "../Active";  # Active CFG files go here.
my $Log_Root     	= "../Logs/MRTG_Polling_Logs";
opendir DIR, $Active_Root or die "$0: ERROR, Cannot read directory
$Active_Root : $!\n";
my @files = grep /\.cfg$/i , readdir(DIR);
closedir DIR 	or die "$0: ERROR, Cannot close directory $Active_Root :
$!\n";
@files  		or die "$0: ERROR, No CFG files files found in
$Active_Root\n";

my $sleep_time = int(300/ (@files+1) );

for my $cfg_file (@files) {
	my ($day,$mon,$year)=(localtime)[3,4,5];
	my $date=sprintf "%04d-%02d-%02d", $year+1900,$mon+1,$day;
	(my $log_file = $cfg_file)=~s/.cfg$/".$date.log"/e;
	system("perl mrtg --logging=$Log_Root/$log_file
$Active_Root/$cfg_file \&");
	sleep $sleep_time;
}
	
	


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