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RRDp (3)
  • >> RRDp (3) ( Разные man: Библиотечные вызовы )
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    NAME

    RRDp - Attach rrdtool from within a perl script via a set of pipes;
     
    

    SYNOPSIS

    use RRDp

    RRDp::start path to rrdtool executable

    RRDp::cmd rrdtool commandline

    $answer = RRD::read

    $status = RRD::end

    $RRDp::user, $RRDp::sys, $RRDp::real  

    DESCRIPTION

    With this module you can safely communicate with the rrdtool.

    After every RRDp::cmd you have to issue an RRDp::read command to get rrdtools answer to your command. The answer is returned as a pointer, in order to speed things up. If the last command did not return any data, RRDp::read will return an undefined variable.

    If you import the PERFORMANCE variables into your namespace, you can access rrdtools internal performance measurements.

    use RRDp
    Load the RRDp::pipe module.
    RRDp::start path to rrdtool executable
    start rrdtool. The argument must be the path to the rrdtool executable
    RRDp::cmd rrdtool commandline
    pass commands on to rrdtool. check the rrdtool documentation for more info on the rrdtool commands.
    $answer = RRDp::read
    read rrdtools response to your command. Note that the $answer variable will only contain a pointer to the returned data. The reason for this is, that rrdtool can potentially return quite excessive amounts of data and we don't want to copy this around in memory. So when you want to access the contents of $answer you have to use $$answer which dereferences the variable.
    $status = RRDp::end
    terminates rrdtool and returns rrdtools status ...
    $RRDp::user, $RRDp::sys, $RRDp::real
    these variables will contain totals of the user time, system time and real time as seen by rrdtool. User time is the time rrdtool is running, System time is the time spend in system calls and real time is the total time rrdtool has been running.

    The difference between user + system and real is the time spent waiting for things like the hard disk and new input from the perl script.

     

    EXAMPLE

     use RRDp;
     RRDp::start "/usr/bin/rrdtool";
     RRDp::cmd   qw(create demo.rrd --step 100 
                   DS:in:GAUGE:100:U:U
                   RRA:AVERAGE:0.5:1:10);
     $answer = RRDp::read;
     print $$answer;
     ($usertime,$systemtime,$realtime) =  ($RRDp::user,$RRDp::sys,$RRDp::real);
    
    
     

    SEE ALSO

    For more information on how to use rrdtool, check the manpages.  

    AUTHOR

    Tobias Oetiker <oetiker@ee.ethz.ch>


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    EXAMPLE
    SEE ALSO
    AUTHOR


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