Memory leaks - what causes them?

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----- 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 that’s 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 I’m presuming that it’s 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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Hi David,

 

I’ve modified code/common/monitor_memory.pl so that it runs every minute rather than every 10 minutes and I’ve reduced the reporting threshold from 0.5MB to 0.05MB.

 

I am running the weather graphing script and although I haven’t yet done what you suggested, it is looking like it may be the culprit because the leak spikes at hh:01, hh:11, hh:21, etc which suggests that the leak is being caused by something that runs every 10 minutes.

 

However, equally disturbing is the ~2MB leak that occurs after each of the reloads.  It appears that MH reloads itself after each trigger event because the two at 17:20 correlate to me manually reloading the code and the reloads at 17:35, 19:30 and 20:30 correlate with some one-shot triggers that I had set.

 

I searched back through my archive of the mailing list and through the wiki for info on memory leaks and came up with very little.  Definitely keen to see something written up on them and I’m happy to do so if/when we work out what’s causing them.

 

 

Wed 11/02/09 17:00:01  49.0 hours:   0.2 MB in  0.1 hours.  211.2 -> 211.4 at  1.17 MB/hour.  Total:  3.31 MB/hour

Wed 11/02/09 17:01:00  49.0 hours:   0.2 MB in  0.0 hours.  211.4 -> 211.6 at 11.04 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:02:00  49.0 hours:   0.2 MB in  0.0 hours.  211.6 -> 211.7 at 10.08 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:11:00  49.2 hours:   0.4 MB in  0.1 hours.  211.7 -> 212.1 at  2.69 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:20:00  49.3 hours:   0.6 MB in  0.1 hours.  212.1 -> 212.7 at  4.08 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:20:16    ReLoad

Wed 11/02/09 17:20:25    ReLoad

Wed 11/02/09 17:21:01  49.4 hours:   2.3 MB in  0.0 hours.  212.7 -> 215.0 at 138.00 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 17:35:10    ReLoad

Wed 11/02/09 17:36:01  49.6 hours:   1.5 MB in  0.2 hours.  215.0 -> 216.5 at  5.87 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 17:51:01  49.9 hours:   0.3 MB in  0.2 hours.  216.5 -> 216.8 at  1.30 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 17:58:00  50.0 hours:   0.2 MB in  0.1 hours.  216.8 -> 217.0 at  1.44 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:01:00  50.0 hours:   0.3 MB in  0.1 hours.  217.0 -> 217.3 at  5.04 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:02:00  50.0 hours:   0.2 MB in  0.0 hours.  217.3 -> 217.5 at 12.72 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 18:10:00  50.2 hours:   0.1 MB in  0.1 hours.  217.5 -> 217.6 at  1.02 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:11:00  50.2 hours:   0.2 MB in  0.0 hours.  217.6 -> 217.8 at 11.04 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:12:01  50.2 hours:   0.2 MB in  0.0 hours.  217.8 -> 218.0 at 12.48 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 18:20:00  50.3 hours:   0.1 MB in  0.1 hours.  218.0 -> 218.1 at  0.99 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:21:01  50.4 hours:   0.2 MB in  0.0 hours.  218.1 -> 218.3 at 12.72 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:22:00  50.4 hours:   0.2 MB in  0.0 hours.  218.3 -> 218.5 at 11.76 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 18:31:00  50.5 hours:   0.4 MB in  0.1 hours.  218.5 -> 219.0 at  2.83 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:38:00  50.6 hours:   0.1 MB in  0.1 hours.  219.0 -> 219.1 at  1.20 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:41:00  50.7 hours:   0.3 MB in  0.1 hours.  219.1 -> 219.4 at  5.92 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:43:00  50.7 hours:   0.2 MB in  0.0 hours.  219.4 -> 219.6 at  5.52 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:51:01  50.9 hours:   0.3 MB in  0.1 hours.  219.6 -> 219.9 at  2.49 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:52:00  50.9 hours:   0.2 MB in  0.0 hours.  219.9 -> 220.1 at 11.52 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:01:00  51.0 hours:   0.4 MB in  0.1 hours.  220.1 -> 220.5 at  2.91 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:08:00  51.1 hours:   0.1 MB in  0.1 hours.  220.5 -> 220.7 at  1.17 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:11:00  51.2 hours:   0.3 MB in  0.1 hours.  220.7 -> 221.0 at  5.68 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:13:00  51.2 hours:   0.2 MB in  0.0 hours.  221.0 -> 221.2 at  6.00 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:21:01  51.4 hours:   0.3 MB in  0.1 hours.  221.2 -> 221.5 at  2.31 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:22:00  51.4 hours:   0.2 MB in  0.0 hours.  221.5 -> 221.7 at 12.96 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:30:14    ReLoad

Wed 11/02/09 19:31:00  51.5 hours:   1.9 MB in  0.1 hours.  221.7 -> 223.6 at 12.75 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 19:48:01  51.8 hours:   0.1 MB in  0.3 hours.  223.6 -> 223.7 at  0.49 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 19:51:01  51.9 hours:   0.3 MB in  0.1 hours.  223.7 -> 224.0 at  5.28 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 19:52:00  51.9 hours:   0.2 MB in  0.0 hours.  224.0 -> 224.2 at 12.48 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 19:59:00  52.0 hours:   0.1 MB in  0.1 hours.  224.2 -> 224.4 at  1.20 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:01:00  52.0 hours:   0.2 MB in  0.0 hours.  224.4 -> 224.6 at  6.72 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:02:00  52.0 hours:   0.2 MB in  0.0 hours.  224.6 -> 224.7 at  9.84 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 20:11:00  52.2 hours:   0.4 MB in  0.1 hours.  224.7 -> 225.1 at  2.64 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:17:00  52.3 hours:   0.2 MB in  0.1 hours.  225.1 -> 225.3 at  1.60 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:21:01  52.4 hours:   0.3 MB in  0.1 hours.  225.3 -> 225.6 at  4.56 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:22:00  52.4 hours:   0.2 MB in  0.0 hours.  225.6 -> 225.8 at 10.32 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 20:30:01  52.5 hours:   0.1 MB in  0.1 hours.  225.8 -> 225.9 at  1.08 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:30:13    ReLoad

Wed 11/02/09 20:31:00  52.5 hours:   1.8 MB in  0.0 hours.  225.9 -> 227.8 at 110.16 MB/hour.  Total:  3.40 MB/hour

Wed 11/02/09 20:46:00  52.8 hours:   0.1 MB in  0.2 hours.  227.8 -> 227.9 at  0.54 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 20:50:00  52.8 hours:   0.1 MB in  0.1 hours.  227.9 -> 228.0 at  1.98 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 20:51:01  52.9 hours:   0.2 MB in  0.0 hours.  228.0 -> 228.2 at 11.04 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 20:52:00  52.9 hours:   0.2 MB in  0.0 hours.  228.2 -> 228.4 at 11.28 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:00:01  53.0 hours:   0.1 MB in  0.1 hours.  228.4 -> 228.5 at  1.05 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:01:00  53.0 hours:   0.2 MB in  0.0 hours.  228.5 -> 228.7 at 11.04 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:02:00  53.0 hours:   0.2 MB in  0.0 hours.  228.7 -> 228.9 at 12.00 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:10:00  53.2 hours:   0.1 MB in  0.1 hours.  228.9 -> 229.0 at  0.99 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:11:00  53.2 hours:   0.2 MB in  0.0 hours.  229.0 -> 229.3 at 12.48 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:12:01  53.2 hours:   0.2 MB in  0.0 hours.  229.3 -> 229.4 at 10.80 MB/hour.  Total:  3.39 MB/hour

 

 

 

---

From: David Norwood [mailto:dnorwood2@...]
Sent: Sunday, 8 February 2009 2:48 PM
To: The main list for the MisterHouse home automation program
Subject: Re: [mh] Memory leaks - what causes them?

 

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 that’s 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 I’m presuming that it’s 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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David Norwood wrote:

> 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.

It's always been unbounded arrays that I've seen be the culprit.
Specifically, shoving the same value or object into an array w/o
checking on its existence first (if appropriate).  An example here of
proper bounding is Base_Item::add_item_if_not_present.  If memory leaks
happen on reload, then it's usually non-object arrays that I've seen in
both common code and libs.

Also, consuming memory doesn't necessarily mean a "leak" (where the
occurrence is accidental) since some code/objects "accumulate"
data/objects over time.

I don't see my own mh instance grow by more than 10M over a week.  So, I
attribute that to either "slow leaks" or just normal object "accumulated
bloat".  And, since I routinely develop libs, then I have to restart
usually far more frequently.  Any time I've seen memory leaks grow by
more than that, tracking it down requires you to know a great deal about
what your specific environment/config is implying as well as detailed
knowledge of the code.  Unfortunately, no "magic bullets" for easy
detection (unless good "gut intuition" counts).

Gregg

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Gregg Liming wrote:
I forgot one thing... folks that don't understand using # noloop or the
# noloop=start and # noloop=end "blocks" on methods/statements that do
not inherently perform bounding are just asking for trouble.  If you
have much personal user code, then that's the first place I'd look.
Since I don't always want to have to scrutinize the code, I tend to
"over-use" # noloop even when I know it's pointless (e.g., on "add"
methods).

Gregg

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

From: chris@...

To: misterhouse-users@...

Sent: Wednesday, February 11, 2009 5:01 AM

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

Hi David,

 

I’ve modified code/common/monitor_memory.pl so that it runs every minute rather than every 10 minutes and I’ve reduced the reporting threshold from 0.5MB to 0.05MB.

 

I am running the weather graphing script and although I haven’t yet done what you suggested, it is looking like it may be the culprit because the leak spikes at hh:01, hh:11, hh:21, etc which suggests that the leak is being caused by something that runs every 10 minutes.

 

However, equally disturbing is the ~2MB leak that occurs after each of the reloads.  It appears that MH reloads itself after each trigger event because the two at 17:20 correlate to me manually reloading the code and the reloads at 17:35, 19:30 and 20:30 correlate with some one-shot triggers that I had set.

 

I searched back through my archive of the mailing list and through the wiki for info on memory leaks and came up with very little.  Definitely keen to see something written up on them and I’m happy to do so if/when we work out what’s causing them.

 

 

Wed 11/02/09 17:00:01  49.0 hours:   0.2 MB in  0.1 hours.  211.2 -> 211.4 at  1.17 MB/hour.  Total:  3.31 MB/hour

Wed 11/02/09 17:01:00  49.0 hours:   0.2 MB in  0.0 hours.  211.4 -> 211.6 at 11.04 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:02:00  49.0 hours:   0.2 MB in  0.0 hours.  211.6 -> 211.7 at 10.08 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:11:00  49.2 hours:   0.4 MB in  0.1 hours.  211.7 -> 212.1 at  2.69 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:20:00  49.3 hours:   0.6 MB in  0.1 hours.  212.1 -> 212.7 at  4.08 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:20:16    ReLoad

Wed 11/02/09 17:20:25    ReLoad

Wed 11/02/09 17:21:01  49.4 hours:   2.3 MB in  0.0 hours.  212.7 -> 215.0 at 138.00 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 17:35:10    ReLoad

Wed 11/02/09 17:36:01  49.6 hours:   1.5 MB in  0.2 hours.  215.0 -> 216.5 at  5.87 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 17:51:01  49.9 hours:   0.3 MB in  0.2 hours.  216.5 -> 216.8 at  1.30 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 17:58:00  50.0 hours:   0.2 MB in  0.1 hours.  216.8 -> 217.0 at  1.44 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:01:00  50.0 hours:   0.3 MB in  0.1 hours.  217.0 -> 217.3 at  5.04 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:02:00  50.0 hours:   0.2 MB in  0.0 hours.  217.3 -> 217.5 at 12.72 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 18:10:00  50.2 hours:   0.1 MB in  0.1 hours.  217.5 -> 217.6 at  1.02 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:11:00  50.2 hours:   0.2 MB in  0.0 hours.  217.6 -> 217.8 at 11.04 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:12:01  50.2 hours:   0.2 MB in  0.0 hours.  217.8 -> 218.0 at 12.48 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 18:20:00  50.3 hours:   0.1 MB in  0.1 hours.  218.0 -> 218.1 at  0.99 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:21:01  50.4 hours:   0.2 MB in  0.0 hours.  218.1 -> 218.3 at 12.72 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:22:00  50.4 hours:   0.2 MB in  0.0 hours.  218.3 -> 218.5 at 11.76 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 18:31:00  50.5 hours:   0.4 MB in  0.1 hours.  218.5 -> 219.0 at  2.83 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:38:00  50.6 hours:   0.1 MB in  0.1 hours.  219.0 -> 219.1 at  1.20 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:41:00  50.7 hours:   0.3 MB in  0.1 hours.  219.1 -> 219.4 at  5.92 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:43:00  50.7 hours:   0.2 MB in  0.0 hours.  219.4 -> 219.6 at  5.52 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:51:01  50.9 hours:   0.3 MB in  0.1 hours.  219.6 -> 219.9 at  2.49 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:52:00  50.9 hours:   0.2 MB in  0.0 hours.  219.9 -> 220.1 at 11.52 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:01:00  51.0 hours:   0.4 MB in  0.1 hours.  220.1 -> 220.5 at  2.91 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:08:00  51.1 hours:   0.1 MB in  0.1 hours.  220.5 -> 220.7 at  1.17 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:11:00  51.2 hours:   0.3 MB in  0.1 hours.  220.7 -> 221.0 at  5.68 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:13:00  51.2 hours:   0.2 MB in  0.0 hours.  221.0 -> 221.2 at  6.00 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:21:01  51.4 hours:   0.3 MB in  0.1 hours.  221.2 -> 221.5 at  2.31 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:22:00  51.4 hours:   0.2 MB in  0.0 hours.  221.5 -> 221.7 at 12.96 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:30:14    ReLoad

Wed 11/02/09 19:31:00  51.5 hours:   1.9 MB in  0.1 hours.  221.7 -> 223.6 at 12.75 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 19:48:01  51.8 hours:   0.1 MB in  0.3 hours.  223.6 -> 223.7 at  0.49 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 19:51:01  51.9 hours:   0.3 MB in  0.1 hours.  223.7 -> 224.0 at  5.28 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 19:52:00  51.9 hours:   0.2 MB in  0.0 hours.  224.0 -> 224.2 at 12.48 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 19:59:00  52.0 hours:   0.1 MB in  0.1 hours.  224.2 -> 224.4 at  1.20 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:01:00  52.0 hours:   0.2 MB in  0.0 hours.  224.4 -> 224.6 at  6.72 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:02:00  52.0 hours:   0.2 MB in  0.0 hours.  224.6 -> 224.7 at  9.84 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 20:11:00  52.2 hours:   0.4 MB in  0.1 hours.  224.7 -> 225.1 at  2.64 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:17:00  52.3 hours:   0.2 MB in  0.1 hours.  225.1 -> 225.3 at  1.60 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:21:01  52.4 hours:   0.3 MB in  0.1 hours.  225.3 -> 225.6 at  4.56 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:22:00  52.4 hours:   0.2 MB in  0.0 hours.  225.6 -> 225.8 at 10.32 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 20:30:01  52.5 hours:   0.1 MB in  0.1 hours.  225.8 -> 225.9 at  1.08 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:30:13    ReLoad

Wed 11/02/09 20:31:00  52.5 hours:   1.8 MB in  0.0 hours.  225.9 -> 227.8 at 110.16 MB/hour.  Total:  3.40 MB/hour

Wed 11/02/09 20:46:00  52.8 hours:   0.1 MB in  0.2 hours.  227.8 -> 227.9 at  0.54 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 20:50:00  52.8 hours:   0.1 MB in  0.1 hours.  227.9 -> 228.0 at  1.98 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 20:51:01  52.9 hours:   0.2 MB in  0.0 hours.  228.0 -> 228.2 at 11.04 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 20:52:00  52.9 hours:   0.2 MB in  0.0 hours.  228.2 -> 228.4 at 11.28 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:00:01  53.0 hours:   0.1 MB in  0.1 hours.  228.4 -> 228.5 at  1.05 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:01:00  53.0 hours:   0.2 MB in  0.0 hours.  228.5 -> 228.7 at 11.04 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:02:00  53.0 hours:   0.2 MB in  0.0 hours.  228.7 -> 228.9 at 12.00 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:10:00  53.2 hours:   0.1 MB in  0.1 hours.  228.9 -> 229.0 at  0.99 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:11:00  53.2 hours:   0.2 MB in  0.0 hours.  229.0 -> 229.3 at 12.48 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:12:01  53.2 hours:   0.2 MB in  0.0 hours.  229.3 -> 229.4 at 10.80 MB/hour.  Total:  3.39 MB/hour

 

 

 

---

From: David Norwood [mailto:dnorwood2@...]
Sent: Sunday, 8 February 2009 2:48 PM
To: The main list for the MisterHouse home automation program
Subject: Re: [mh] Memory leaks - what causes them?

 

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 that’s 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 I’m presuming that it’s 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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Gregg wrote:

I've narrowed my memory leak problem down to the rss_file_process subroutine
in my mh/code/common/rss_subscriber.pl script.  Each of the arrays and
hashes are defined locally to the subroutine in "my  ..." statements.
Doesn't that mean the memory they take up is freed when the subroutine
returns?

Would you mind taking a look at the rss_file_process subroutine in
mh/code/common/rss_subscriber.pl and see if you find a problem?

David



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David Norwood wrote:
I can't think of a reason why they wouldn't be.

> Would you mind taking a look at the rss_file_process subroutine in
> mh/code/common/rss_subscriber.pl and see if you find a problem?

Nothing immediately "jumps out".  But a couple of questions:

1) Do you ever see "Process Eval results: ... " displayed?  If so, then
I wonder if there is a problem if the untie is never reached (line 210
in rss_subscribed.pl).

2) Have you tried uncommenting exit and commenting out exec 'true' in
Process_Item (lines 193 and 196)?  You'd have to assess whether doing so
might cause issues elsewhere.  Given the comments there about DESTROY, I
wonder if there's missing garbage collection.

3) Is there any purpose to $list and @itemslist in rss_file_process?
(this is more a "housekeeping" question than anything else).

I'll stare at it some more; but, am quite curious about #1 and #2.

Gregg

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Gregg Liming wrote:

> 2) Have you tried uncommenting exit and commenting out exec 'true' in
> Process_Item (lines 193 and 196)?  You'd have to assess whether doing so
> might cause issues elsewhere.  Given the comments there about DESTROY, I
> wonder if there's missing garbage collection.

This may be more trouble than it's worth as I would suggest against
trying it on your production instance and instead isolate to a test
instance that only has your rss_subscribed enabled.

Gregg

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Just as a follow up to this – I finally had a bit of time to play with this and I think that I found the issue.

 

It turns out that I had three NoExpire triggers set for “common” modules that I had installed at some stage but subsequently deactivated/disabled.  I deleted all three of the redundant triggers and now my leak (hemorrhage would be more appropriate) appears to have stopped.  The modules were “get AP news” (get_ap_breaking.pl), “get top 10 list” (internet_top10.pl), and “get daily news” (news_yahoo.pl).  I deleted all 3 triggers in one hit so I don’t know if it was one particular script that was causing the problem or if it was caused by MH trying to call routines that didn’t exist – the latter seems more likely.

 

It’s now been 40 minutes since I removed the modules and MH hasn’t leaked (apart from a ~2mb leak straight after the reload) – previously I was getting one every 5-6 minutes.

 

---

From: Chris Barrett [mailto:chris@...]
Sent: Thursday, 12 February 2009 12:02 AM
To: 'The main list for the MisterHouse home automation program'
Subject: Re: [mh] Memory leaks - what causes them?

 

Hi David,

 

I’ve modified code/common/monitor_memory.pl so that it runs every minute rather than every 10 minutes and I’ve reduced the reporting threshold from 0.5MB to 0.05MB.

 

I am running the weather graphing script and although I haven’t yet done what you suggested, it is looking like it may be the culprit because the leak spikes at hh:01, hh:11, hh:21, etc which suggests that the leak is being caused by something that runs every 10 minutes.

 

However, equally disturbing is the ~2MB leak that occurs after each of the reloads.  It appears that MH reloads itself after each trigger event because the two at 17:20 correlate to me manually reloading the code and the reloads at 17:35, 19:30 and 20:30 correlate with some one-shot triggers that I had set.

 

I searched back through my archive of the mailing list and through the wiki for info on memory leaks and came up with very little.  Definitely keen to see something written up on them and I’m happy to do so if/when we work out what’s causing them.

 

 

Wed 11/02/09 17:00:01  49.0 hours:   0.2 MB in  0.1 hours.  211.2 -> 211.4 at  1.17 MB/hour.  Total:  3.31 MB/hour

Wed 11/02/09 17:01:00  49.0 hours:   0.2 MB in  0.0 hours.  211.4 -> 211.6 at 11.04 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:02:00  49.0 hours:   0.2 MB in  0.0 hours.  211.6 -> 211.7 at 10.08 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:11:00  49.2 hours:   0.4 MB in  0.1 hours.  211.7 -> 212.1 at  2.69 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:20:00  49.3 hours:   0.6 MB in  0.1 hours.  212.1 -> 212.7 at  4.08 MB/hour.  Total:  3.32 MB/hour

Wed 11/02/09 17:20:16    ReLoad

Wed 11/02/09 17:20:25    ReLoad

Wed 11/02/09 17:21:01  49.4 hours:   2.3 MB in  0.0 hours.  212.7 -> 215.0 at 138.00 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 17:35:10    ReLoad

Wed 11/02/09 17:36:01  49.6 hours:   1.5 MB in  0.2 hours.  215.0 -> 216.5 at  5.87 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 17:51:01  49.9 hours:   0.3 MB in  0.2 hours.  216.5 -> 216.8 at  1.30 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 17:58:00  50.0 hours:   0.2 MB in  0.1 hours.  216.8 -> 217.0 at  1.44 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:01:00  50.0 hours:   0.3 MB in  0.1 hours.  217.0 -> 217.3 at  5.04 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:02:00  50.0 hours:   0.2 MB in  0.0 hours.  217.3 -> 217.5 at 12.72 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 18:10:00  50.2 hours:   0.1 MB in  0.1 hours.  217.5 -> 217.6 at  1.02 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:11:00  50.2 hours:   0.2 MB in  0.0 hours.  217.6 -> 217.8 at 11.04 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:12:01  50.2 hours:   0.2 MB in  0.0 hours.  217.8 -> 218.0 at 12.48 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 18:20:00  50.3 hours:   0.1 MB in  0.1 hours.  218.0 -> 218.1 at  0.99 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:21:01  50.4 hours:   0.2 MB in  0.0 hours.  218.1 -> 218.3 at 12.72 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:22:00  50.4 hours:   0.2 MB in  0.0 hours.  218.3 -> 218.5 at 11.76 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 18:31:00  50.5 hours:   0.4 MB in  0.1 hours.  218.5 -> 219.0 at  2.83 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:38:00  50.6 hours:   0.1 MB in  0.1 hours.  219.0 -> 219.1 at  1.20 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:41:00  50.7 hours:   0.3 MB in  0.1 hours.  219.1 -> 219.4 at  5.92 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:43:00  50.7 hours:   0.2 MB in  0.0 hours.  219.4 -> 219.6 at  5.52 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:51:01  50.9 hours:   0.3 MB in  0.1 hours.  219.6 -> 219.9 at  2.49 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 18:52:00  50.9 hours:   0.2 MB in  0.0 hours.  219.9 -> 220.1 at 11.52 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:01:00  51.0 hours:   0.4 MB in  0.1 hours.  220.1 -> 220.5 at  2.91 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:08:00  51.1 hours:   0.1 MB in  0.1 hours.  220.5 -> 220.7 at  1.17 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:11:00  51.2 hours:   0.3 MB in  0.1 hours.  220.7 -> 221.0 at  5.68 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:13:00  51.2 hours:   0.2 MB in  0.0 hours.  221.0 -> 221.2 at  6.00 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:21:01  51.4 hours:   0.3 MB in  0.1 hours.  221.2 -> 221.5 at  2.31 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:22:00  51.4 hours:   0.2 MB in  0.0 hours.  221.5 -> 221.7 at 12.96 MB/hour.  Total:  3.36 MB/hour

Wed 11/02/09 19:30:14    ReLoad

Wed 11/02/09 19:31:00  51.5 hours:   1.9 MB in  0.1 hours.  221.7 -> 223.6 at 12.75 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 19:48:01  51.8 hours:   0.1 MB in  0.3 hours.  223.6 -> 223.7 at  0.49 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 19:51:01  51.9 hours:   0.3 MB in  0.1 hours.  223.7 -> 224.0 at  5.28 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 19:52:00  51.9 hours:   0.2 MB in  0.0 hours.  224.0 -> 224.2 at 12.48 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 19:59:00  52.0 hours:   0.1 MB in  0.1 hours.  224.2 -> 224.4 at  1.20 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:01:00  52.0 hours:   0.2 MB in  0.0 hours.  224.4 -> 224.6 at  6.72 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:02:00  52.0 hours:   0.2 MB in  0.0 hours.  224.6 -> 224.7 at  9.84 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 20:11:00  52.2 hours:   0.4 MB in  0.1 hours.  224.7 -> 225.1 at  2.64 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:17:00  52.3 hours:   0.2 MB in  0.1 hours.  225.1 -> 225.3 at  1.60 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:21:01  52.4 hours:   0.3 MB in  0.1 hours.  225.3 -> 225.6 at  4.56 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:22:00  52.4 hours:   0.2 MB in  0.0 hours.  225.6 -> 225.8 at 10.32 MB/hour.  Total:  3.38 MB/hour

Wed 11/02/09 20:30:01  52.5 hours:   0.1 MB in  0.1 hours.  225.8 -> 225.9 at  1.08 MB/hour.  Total:  3.37 MB/hour

Wed 11/02/09 20:30:13    ReLoad

Wed 11/02/09 20:31:00  52.5 hours:   1.8 MB in  0.0 hours.  225.9 -> 227.8 at 110.16 MB/hour.  Total:  3.40 MB/hour

Wed 11/02/09 20:46:00  52.8 hours:   0.1 MB in  0.2 hours.  227.8 -> 227.9 at  0.54 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 20:50:00  52.8 hours:   0.1 MB in  0.1 hours.  227.9 -> 228.0 at  1.98 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 20:51:01  52.9 hours:   0.2 MB in  0.0 hours.  228.0 -> 228.2 at 11.04 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 20:52:00  52.9 hours:   0.2 MB in  0.0 hours.  228.2 -> 228.4 at 11.28 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:00:01  53.0 hours:   0.1 MB in  0.1 hours.  228.4 -> 228.5 at  1.05 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:01:00  53.0 hours:   0.2 MB in  0.0 hours.  228.5 -> 228.7 at 11.04 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:02:00  53.0 hours:   0.2 MB in  0.0 hours.  228.7 -> 228.9 at 12.00 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:10:00  53.2 hours:   0.1 MB in  0.1 hours.  228.9 -> 229.0 at  0.99 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:11:00  53.2 hours:   0.2 MB in  0.0 hours.  229.0 -> 229.3 at 12.48 MB/hour.  Total:  3.39 MB/hour

Wed 11/02/09 21:12:01  53.2 hours:   0.2 MB in  0.0 hours.  229.3 -> 229.4 at 10.80 MB/hour.  Total:  3.39 MB/hour

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Chris Barrett wrote:
I took a quick look at news_yahoo.pl and noticed that the %news
hashtable never gets cleared out after writing out to the temporary
files.  So, it's pretty obvious where the problem lies with that one.
I'm guessing the same thing exists in the others as well.

Gregg

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