Possible Memory leak?
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Jamsheed K
Nov 14, 2014, 7:12:55 AM11/14/14
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I have a IaaS cloud on DigitalOcean with 1gb ram and hosts 2 of my mobile application backends in there.
I use bouncy to get the requests from port 80 and redirects it to the 2 apps.
I recently brought together both of these 2 apps together, they used to work fine independently on 512 mb ram servers.
Both are just apis that does just one purpose most of the time. One app being an xml searching app, searching 6 local xml files and outputs one. Another app is just a static file server, serving about 1200 small images. Here is the output for my free command.
total used free shared buffers cached
Mem: 1017956 939592 78364 24 54256 121336
-/+ buffers/cache: 764000 253956
Swap: 4194300 270660 3923640
There is only moderate traffic on both these apps, maybe about 2 req/sec rate. You can see that my free memory is too low 78364. the used memory grew from less than half of what is now, after i started the app.
After a day or even less, the apps going to fail, with one app giving me "Evacualtion allocation failed, process out of memory" error, and the networking in the ubuntu server fails. I have to reboot them from the dashboard to get the server up again.
So i started printing the proccess.memoryusage and here it is:
App 1: { rss: 389242880, heapTotal: 58235904, heapUsed: 32149968 }
App 2: { rss: 89575424, heapTotal: 49980416, heapUsed: 27664696 }
Are you noticing a problem. I dont know much about memory debugging, can you point out anything that is wrong to me.
I also tried node-memwatch, logging on 'stats' and 'leak'. The server is up for a day, and so far I dont have a leak. Anyway, I will print the logged stats now.
App 1:
{ num_full_gc: 1,
num_inc_gc: 1,
heap_compactions: 1,
usage_trend: 0,
estimated_base: 9375592,
current_base: 9375592,
min: 0,
max: 0 }
{ num_full_gc: 1,
num_inc_gc: 1,
heap_compactions: 1,
usage_trend: 0,
estimated_base: 9668888,
current_base: 9668888,
min: 0,
max: 0 }
{ num_full_gc: 1,
num_inc_gc: 1,
heap_compactions: 1,
usage_trend: 0,
estimated_base: 10864608,
current_base: 10864608,
min: 0,
max: 0 }
{ num_full_gc: 2,
num_inc_gc: 4,
heap_compactions: 2,
usage_trend: 0,
estimated_base: 15852832,
current_base: 15852832,
min: 0,
max: 0 }
{ num_full_gc: 3,
num_inc_gc: 16,
heap_compactions: 3,
usage_trend: 0,
estimated_base: 16457640,
current_base: 16457640,
min: 16457640,
max: 16457640 }
{ num_full_gc: 4,
num_inc_gc: 33,
heap_compactions: 4,
usage_trend: 0,
estimated_base: 16104624,
current_base: 16104624,
min: 16104624,
max: 16457640 }App 2:
{ num_full_gc: 1,
num_inc_gc: 1,
heap_compactions: 1,
usage_trend: 0,
estimated_base: 7368408,
current_base: 7368408,
min: 0,
max: 0 }
{ num_full_gc: 2,
num_inc_gc: 1,
heap_compactions: 2,
usage_trend: 0,
estimated_base: 7528144,
current_base: 7528144,
min: 0,
max: 0 }
{ num_full_gc: 3,
num_inc_gc: 1,
heap_compactions: 3,
usage_trend: 0,
estimated_base: 7849616,
current_base: 7849616,
min: 7849616,
max: 7849616 }
{ num_full_gc: 4,
num_inc_gc: 1,
heap_compactions: 4,
usage_trend: 0,
estimated_base: 7894376,
current_base: 7894376,
min: 7849616,
max: 7894376 }
{ num_full_gc: 5,
num_inc_gc: 1,
heap_compactions: 5,
usage_trend: 0,
estimated_base: 7628840,
current_base: 7628840,
min: 7628840,
max: 7894376 }
{ num_full_gc: 6,
num_inc_gc: 1,
heap_compactions: 6,
usage_trend: 0,
estimated_base: 7307016,
current_base: 7307016,
min: 7307016,
max: 7894376 }
{ num_full_gc: 7,
num_inc_gc: 1,
heap_compactions: 7,
usage_trend: 0,
estimated_base: 7405248,
current_base: 7405248,
min: 7307016,
max: 7894376 }
{ num_full_gc: 8,
num_inc_gc: 1,
heap_compactions: 8,
usage_trend: 0,
estimated_base: 7441416,
current_base: 7441416,
min: 7307016,
max: 7894376 }
{ num_full_gc: 9,
num_inc_gc: 1,
heap_compactions: 9,
usage_trend: 0,
estimated_base: 7466384,
current_base: 7466384,
min: 7307016,
max: 7894376 }
{ num_full_gc: 10,
num_inc_gc: 1,
heap_compactions: 10,
usage_trend: 0,
estimated_base: 7471194,
current_base: 7514488,
min: 7307016,
max: 7894376 }
{ num_full_gc: 11,
num_inc_gc: 1,
heap_compactions: 11,
usage_trend: 0,
estimated_base: 7472706,
current_base: 7486320,
min: 7307016,
max: 7894376 }There is more output in App 2, but I think this would do.
So far, no leak triggered.
But I am new to analysing memory dumps, can anyone help me out on this?
Andreas Marschke
Nov 14, 2014, 11:59:22 AM11/14/14
to nod...@googlegroups.com
Hi!
Just as I was idliy reading the documentation for node-memwatch this mail popped up!
So yeah I would like to see a solution for this as well. And besides looking into adding memwatch to
my toolchain I'll also be using heapdiff() from memwatch. This way you can diff the heaps between
runtimes of the Garbage collector. But that of course depends on how much of the documentation
correlates to reality.
I too have a similiar Problem running a node process with an express app listening on 80 and 443.
I'll report back when I have sensible Data.
Cheers and please post back if you have something!
Andreas Marschke.
Jimb Esser
Nov 17, 2014, 7:45:44 PM11/17/14
to nod...@googlegroups.com
It looks like all of the memory being used is in your App1, and not in the Javascript Heap (heap is just 58MB but the resident set size is 371MB). Unless you're using custom native modules, that probably means you're accumulating/leaking Buffer objects (which, if I remember right, are not in the JS heap). Common causes of this would be hanging on to data returned from low level functions like fs.read or from network events.
If you're on a Linux system, and you want to know where your native (non-JS) memory is being allocated from, you can try node-mtrace, however, unless you're using custom native modules, it's probably just going to say 320MB allocated from node_buffer.cc or C++'s new(), which won't be particularly helpful.
Hope some of that helps!
...
Jamsheed K
Nov 18, 2014, 12:32:47 AM11/18/14
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The libraries I use are fs, async, and libxmljs. I don't get what you refer to as custom native modules. Yeah, I use fs.readFile(). How do I understand if it caused the problem.
I did a heapdiff at points of the beginning of this function and ending of this function and got this. Mem stays at ~9mb according to this.
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kb", "freed_nodes": 870, "allocated_nodes": 446, "details": [{ "what": "Arguments", "size_bytes": -112, "size": "-112 bytes", "+": 1, "-": 4 }, { "what": "Array", "size_bytes": -7608, "size": "-7.43 kb", "+": 146, "-": 301 }, { "what": "Closure", "size_bytes": -648, "size": "-648 bytes", "+": 14, "-": 23 }, { "what": "Code", "size_bytes": -38528, "size": "-37.63 kb", "+": 78, "-": 205 }, { "what": "Number", "size_bytes": 32, "size": "32 bytes", "+": 4, "-": 2 }, { "what": "Object", "size_bytes": 224, "size": "224 bytes", "+": 9, "-": 3 }, { "what": "SendStream", "size_bytes": -104, "size": "-104 bytes", "+": 0, "-": 1 }, { "what": "String", "size_bytes": 211680, "size": "206.72 kb", "+": 83, "-": 69 }, { "what": "Url", "size_bytes": -120, "size": "-120 bytes", "+": 0, "-": 1 }] }}Jamsheed K
Nov 18, 2014, 12:59:50 PM11/18/14
to nod...@googlegroups.com
Found the culprit. It wasn't App1 or App2. It was the bouncy process all along.
Analysed both apps using StrongOps from Strongloop, but didnt find anything disturbing. So I checked bouncy script.
and saw this.
Well. That explains it.
Instead of using the script, I am trying bouncy - the command line tool now, with 'screen' to run it in background. Lets see how it comes around.
...
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