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Forum Discussion

mrintzler's avatar
mrintzler
Icon for Nimbostratus rankNimbostratus
Feb 04, 2008

iRule causing ever-increasing TMM CPU utilization

I've adapted an iRule written by Deb Allen to rate limit (in count, not in bps) PDF downloads from one of our web applications. It basically counts the number of PDF's downloaded in the past 10 secon...
application delivery
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devops
iRules
spark_86682's avatar
spark_86682
Historic F5 Account
Feb 06, 2008
It sounds like you've diagnosed the problem correctly in that your array just grows over time. If a client just downloads a PDF and leaves, I don't see any way that your iRule ever cleans that entry out of the array, so under normal use, the array would just grow and grow.

 

 

I don't have a perfect suggestion for you; here don't yet exist any timer commands for you to run a block of code every so often. You could do something like keep a counter of how many HTTP_REQUEST events you've seen and completely clear out the array every 100,000 or so.