Hi,
I've just upgraded from 0.8.19 to 0.10.5 and my app that would previously
run happily for days on a Raspberry Pi now dies overnight due to running
out of memory. I see there were some changes to the GC handling in 0.10
that I wonder could be the cause of this.
I've narrowed the problem code down to the use of script.runInNewContext(
sandbox);
Here is a simple test case that demonstrates the same symptoms, using a
slightly modified version of the example code in the vm module docs.
var util = require('util'),
vm = require('vm'),
sandbox = {
animal: 'cat',
count: 2
};
var script = vm.createScript('count += 1; name = "kitty"', 'myfile.vm');
setInterval(function() {
script.runInNewContext(sandbox);
console.log(util.inspect(sandbox));
},50);
Essentially, this code invokes script.runInNewContext repeatedly. I've used
a very short time out so I can test quickly; in the real app
runInNewContext is being run about once a second.
I've run this on my laptop (Ubuntu 12.04), monitoring the memory usage over
time.
With 0.8.19, the memory usage peaks around 60Mb and then stabilises around
30Mb with fluctuations as the garbage collector does its thing.
With 0.10.5 the memory usage continually increases - with very slight dips
as, presumably, some garbage collecting is happening. But it does not
stabilise. I've not run it all the way to a crash on the Pi, but in a 15
minute run, the memory usage hits just under 700Mb.
Any ideas what is happening, or perhaps what I'm missing here? It looks
like either a leak in runInNewContext, or there is something about this
code that the changes to gc don't favour.
Regards,
Nick
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