The fun part is that after we do some stress testing making 10000 calls for 60 seconds, event loop has noticeable delays of more than 10 sec and still growing the memory topped at 600 MB, and the server starts to respond with timeouts.Īs you can see some memory leaks drastically affects the performance also not only the memory. The limit can be raised by setting -maxoldspacesize to a maximum of 1024 (1 GB) (32-bit) and 1741 (1.7 GiB) (64-bit), but it is recommended that you. The following example will show an easy way to add a memory leak in your code, even for trained eyes is hard to spot the problem: const connector = require('./lib/connector') Ĭonnector.on('connected', async (db) => = require('events') ĬtMaxListeners(0) // You will be able to attach Indefinitly events Also, we will do some analysis using node clinic tool and chrome dev-tools to identify a nasty memory leak. Here is an example from in Node v0.12. The hunt malloc, calloc, realloc and free ) with its own implementations, allowing it to track all dynamic memory usage within the program. Prometheus is 100 open source and community-driven. It’s the most notable and famous open-source monitoring tool you can use today.
Unless you’re living under a rock, you must have heard of Prometheus. You can configure Node.js in the following ways to reduce RAM usage: Use the -max-old-space-size flag: This flag can be used to set the max memory that Node.js. var os require ('os') console.log (os.cpus ()) console.log (os.totalmem ()) console.log (os.
In the second part, we will focus on event emitters and cached objects. 1,941 2 12 6 Add a comment 5 Answers Sorted by: 222 The built-in process module has a method memoryUsage that offers insight in the memory usage of the current Node.js process. Once you run your server go to the /status route to monitor your Node.js metrics. 1,383 3 12 23 Add a comment 8 Answers Sorted by: 127 The native module os can give you some memory and cpu usage statistics.
#Nodejs memory monitor series#
This article would be the second part of the series "Understanding memory leaks in node" if you did not read the first part you can find it here.
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