[rrd-users] Re: How best to load up RRDs::graph

[Joe Loiacono]

Doh! ... left off the graph filename ... 



Joe Loiacono/CIV/CSC at CSC 
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06/09/2006 05:00 PM

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[rrd-users] How best to load up RRDs::graph






I have stared at this a long time, but can't see the problem. The issue 
has come about because I'm fiddling with the way Perl provides the 
parameters to RRDs::graph, trying to be able to include/exclude certain 
parameters when necessary. The same thing works using the old way (see 
below - the Perl is at the bottom.) 
TIA, Joe

I print out what I have and try the command line (the rrd file and DS are 
valid):

rrdtool graph --title Last24Hours --start 1149797278 --end 1149883678 
--width 600 --height 150 --slope-mode 
DEF:flowbits=/htp/cgi-bin/FlowViewer_3.0/FlowTracker_RRDTool/science_data.rrd:flowbits:AVERAGE 

VDEF:flowbitsmax=flowbits,MAXIMUM VDEF:flowbitsavg=flowbits,AVERAGE 
VDEF:flowbitsmin=flowbits,MINIMUM VDEF:flowbitspct=flowbits,95,PERCENT 
AREA:flowbits#FFE0C0 LINE:0.3:flowbits#000000

ERROR: Not a valid vname: flowbits in line 
VDEF:flowbitsmax=flowbits,MAXIMUM


New Perl (trying two methods):

@graph_parameters = 
                    ('--title',"$rrd_title", 
                     '--start',$start_rrd, 
                     '--end',$end_rrd, 
                     '--width',$rrd_width, 
                     '--height',$rrd_height,$slope_mode, 
                     "DEF:flowbits=$rrdtool_file:flowbits:AVERAGE", 
                     'VDEF:flowbitsmax=flowbits,MAXIMUM', 
                     'VDEF:flowbitsavg=flowbits,AVERAGE', 
                     'VDEF:flowbitsmin=flowbits,MINIMUM', 
                     'VDEF:flowbitspct=flowbits,95,PERCENT', 
                     "AREA:flowbits#$rrd_area", 
                     "LINE:$rrd_thick:flowbits#$rrd_line" ); 
 
 print "@graph_parameters\n\n";
 
 $rrdgraph_command = "rrdtool graph " . "@graph_parameters";
 print "\n$rrdgraph_command\n";
 system($rrdgraph_command);
 
 RRDs::graph $graph_file, @graph_paramters;


Old Perl (works, but with limited flexibility, can't use empty variables)

RRDs::graph "$graph_file", 
            "--title=$rrd_title", 
            "--start=$start_rrd", 
            "--end=$end_rrd", 
            "--slope-mode", 
            "--width=$rrd_width", 
            "--height=$rrd_height",
            "DEF:flowbits=$rrdtool_file:flowbits:AVERAGE", 
            "VDEF:flowbitsmax=flowbits,MAXIMUM", 
            "VDEF:flowbitsavg=flowbits,AVERAGE", 
            "VDEF:flowbitsmin=flowbits,MINIMUM", 
            "VDEF:flowbitspct=flowbits,95,PERCENT", 
            "AREA:flowbits#$rrd_area:", 
            "LINE$rrd_thick:flowbits#$rrd_line:"; 


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