November 8, 2023
Understanding the error
When Node.js applications consume more memory than what is available, V8 triggers garbage collection to free up space. If this process does not recover enough memory, the
Checking memory limits
Node.js has a default memory limit. Use the
process.memoryUsage() method to monitor memory usage:
Increasing memory limits
To temporarily increase the memory limit, use the
--max-old-space-size flag when starting your Node.js application:
4096 with the number of megabytes you want to allocate.
Profiling memory usage
Identify memory leaks by taking and analyzing heap snapshots with tools like Chrome DevTools or the
heapdump module. Profile memory usage by:
Review your code for common memory leaks, such as unintended global variables, forgotten timers, or closures that hold onto outer scope variables. Refactor the code to ensure variables are not being retained unnecessarily.
Using memory management techniques
Apply memory management techniques such as debouncing and throttling for event listeners, using weak references with
WeakSet, and explicitly setting variables to
null after use.
Streamlining data processing
For applications handling large datasets, use streaming data processing with
stream module to process data in chunks rather than loading it entirely in memory.
Leveraging external storage
Offload sessions and other memory-intensive data to external stores like Redis or databases. This reduces the memory footprint on the Node.js process.
Modularizing the application
Break down your Node.js application into microservices or child processes using the
cluster module to distribute memory load.
Applying garbage collection strategies
Force garbage collection at strategic points in your application if you're running Node.js with --expose-gc flag:
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