[rrd-users] rrdtool cpu overload

Krishna Kant Chaturvedi krishna.chaturvedi at aricent.com
Tue Dec 16 06:31:24 CET 2008

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",














                    "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

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