[rrd-users] rrdtool cpu overload

[Krishna Kant Chaturvedi]

Hi All,

Please help me.

I have tested the ae_graph_pm.pl script. And found out that the only place its taking high CPU utilization is during a function call



RRDs::graph( "$graphPath/$curName",

                    "--start=$startTime",

                    "--end=$g_time",

                    "-a","PNG",

                    "--title=$title",

                    "--vertical-label=$yaxis",

                    "--width=500",

                    "--height=100",

                    "--alt-autoscale-max",

                                "--lower-limit=0",

                    @defs,

                                @cdefs,

                                @lines,

                    "COMMENT:\\n",

                    "COMMENT: $comment\\n"

                  );



Which is an API given by 3rd party rrd tool.



This function is called in a loop for the number of times the graph time interval is defined multiplied by number of blades.

Ex. Lets say for each balde we have 8 intervals defined 30mins, 3hr, 12hr, 24hr, 1 day, 3 day, 15day, 31day and currently the number of blades is 12





-rw-r--r--   1 ins      insgroup    3378 Dec 11 17:17 System_graph6_12hr.png

-rw-r--r--   1 ins      insgroup    3352 Dec 11 17:17 System_graph6_15day.png

-rw-r--r--   1 ins      insgroup    3420 Dec 11 17:17 System_graph6_31day.png

-rw-r--r--   1 ins      insgroup    3504 Dec 11 17:17 System_graph6_3hr.png

-rw-r--r--   1 ins      insgroup    3530 Dec 11 17:17 System_graph6_24hr.png

-rw-r--r--   1 ins      insgroup    3462 Dec 11 17:17 System_graph6_3hr.png

-rw-r--r--   1 ins      insgroup    3604 Dec 11 17:17 System_graph6_60day.png

-rw-r--r--   1 ins      insgroup    3402 Dec 11 17:17 System_graph6_3day.png



I.e. it is called 8*12 times per  $updateGraphInterval = 300 ( per 5 minutes).



So the High CPU utilization vary from 28% to 49%

           Low CPU Utilization vary from  0.5% to 1%

As observed from the top command.


Thanks & Regards
Krishna

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