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Memory leak in setInterval + console.log + process.memoryUsage #2073
Description
The following code exhibits a growth in RSS and heap over time:
setInterval(function doLog() {
console.log(process.memoryUsage());
}, 100);
Attached image made by excel - extract measurements from above script to clipboard then:
pbpaste | grep heapTotal | cut -d " " -f 3,5,7 | pbcopy
Why is this happening?
Activity
JacksonTian commentedon Jun 29, 2015
process.stdout.write buffered a lot data. Not really memory leak. You can write the data into file instead of.
bnoordhuis commentedon Jun 29, 2015
It's not necessarily indicative of a memory leak. What happens when you restrict the heap size with
--max_old_space_size=32?EricTheOne commentedon Jun 29, 2015
@JacksonTian since I see the measurements as they come on the console, doesn't it mean the buffer gets periodically flushed?
@bnoordhuis checking
Fishrock123 commentedon Jun 29, 2015
The graphs look normal for v8 I think. v8 like to keep as much as it can (within a specified limit, default 1gb iirc) so it doesn't have to re-allocate, is my understanding.
trevnorris commentedon Jun 29, 2015
1.5GB for x64 machines, but @Fishrock123 is correct. V8 feels free to use the heap it's given as freely as it wants. My experience is you can only know it's a memory leak for sure if it can cause the process to crash.
EricTheOne commentedon Jun 30, 2015
@bnoordhuis running with --max_old_space_size=32:
@trevnorris's comment means that looking at the growth in heap utilization is not enough, so I guess this behavior is normal.
Fishrock123 commentedon Jun 30, 2015
Yeah, seems normal, that's just how newer v8 does things. Closing.