In this section, we’re going to discuss old space memory management. In the last section, we discussed how V8 memory is divided and how it handles the new space allocation. For more details, I strongly suggest reading the V8 documentation. Collecting memory from the Old SpaceĪs mentioned above, the V8 Garbage Collector is complex this article aims to show the major features from a broader perspective. These flags are -expose-gc and -trace-gc respectively. ![]() It also provides a way to trace what’s happening in GC. Node.js provides an API to control the GC from the JavaScript side. However, it’s important to mention that, when an object from old space is accessed through to space, it loses the cache locality of your CPU and it might affect performance because the application is not using CPU caches. It’s copied to old space! When an object is moved from the new space to the old space, it’s fully copied, which is an expensive operation.Įven though it’s an expensive operation, the GC is fast enough to do it unnoticeably. For this reason, it’s a good idea to clear the objects as soon as possible to free up memory for new objects and avoid them being allocated in the old space. While the allocation in the new space is very cheap, the new space is also fairly small in size (between 1 and 8MB). From space: the object that survived a Garbage Collection cycle.Note: The heap is divided into several spaces, but in this article, we’ll focus on just two of them. It’s small and designed to be cleaned frequently. New space: most objects are allocated here.The old space can be controlled by the flag -max-old-space-size Usually, objects are moved here after surviving in a new space for some time. Old space: where older objects are stored.The Memory Heap is divided into two major spaces: V8 increases the heap size if it’s still full.V8 garbage collection cleans up the heap. ![]() When an application starts, it triggers the following workflow:
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