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Re: Memory leaks - what causes them?

by David Norwood-3 :: Rate this Message:

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Your leak appears every ten minutes, so I would look for code that runs on that schedule. Are you running the weather graphing script? If so, you should comment out the line in the script that generates the graphs (that should probably be a trigger), and see if that solves it. Otherwise, try disabling each of your scripts for ten minutes. It shouldn't take too long to find the cause.

If your "my" variable declaration is by itself outside of an "if" clause, subroutine, etc, it will be pulled out of the main loop. And I think perl handles the case of a "my" declaration inside an "if" clause, subroutine, etc correctly.

To tell you the truth, I've seen this question asked many times but never seen an example of code that causes a memory leak in misterhouse. This would make a great wiki article if anyone ever figured out some common causes.

David

----- Original Message -----

From: chris@...

To: misterhouse-users@...

Sent: Friday, February 06, 2009 3:33 AM

Subject: [mh] Memory leaks - what causes them?

I have a leak thats costing me about 3Mb/hr.

Fri 06/02/09 21:00:00 37.9 hours:   0.5 MB in 0.2 hours. 168.1 -> 168.6 at 3.02 MB/hour. Total: 3.11 MB/hour

Fri 06/02/09 21:10:00 38.1 hours:   0.5 MB in 0.2 hours. 168.6 -> 169.1 at 3.05 MB/hour. Total: 3.11 MB/hour

Fri 06/02/09 21:20:00 38.3 hours:   0.5 MB in 0.2 hours. 169.1 -> 169.6 at 3.02 MB/hour. Total: 3.11 MB/hour

Fri 06/02/09 21:30:00 38.4 hours:   0.5 MB in 0.2 hours. 169.6 -> 170.1 at 3.02 MB/hour. Total: 3.11 MB/hour

Fri 06/02/09 21:40:00 38.6 hours:   0.5 MB in 0.2 hours. 170.1 -> 170.6 at 3.07 MB/hour. Total: 3.11 MB/hour

Fri 06/02/09 21:50:00 38.8 hours:   0.5 MB in 0.2 hours. 170.6 -> 171.1 at 3.02 MB/hour. Total: 3.11 MB/hour

Fri 06/02/09 22:00:00 38.9 hours:   0.5 MB in 0.2 hours. 171.1 -> 171.6 at 3.02 MB/hour. Total: 3.11 MB/hour

Fri 06/02/09 22:10:00 39.1 hours:   1.3 MB in 0.2 hours. 171.6 -> 172.9 at 7.68 MB/hour. Total: 3.13 MB/hour

I have a couple of custom user code modules so Im presuming that its in one (or more) of those.

What sorts of coding practices lead to memory leaks within MH? Does, for example, the use of my($var) = within a loop cause a leak?

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