12/17/2022 0 Comments Shallow size vs retained size![]() ![]() Sometimes faulty browser extension may introduce memory leakage. Older browsers(IE6–7) were infamous for creating memory leakage as it could not handle circular reference between DOM objects and JavaScript Objects. ![]() In other words, the reference to the table cell from the javascript code allows the table to remain in the memory. The keeps the reference to the table and cannot be garbage collected. In fact, the table still remains in memory. Removing the table from the DOM but keeping the reference to the cell, the GC will not collect everything. Let us consider a scenario: A HTML is composed of many s and s. The button element is still in the dictionary and cannot be collected by garbage collection due to the reference to the button. moryUsage() // Output (in bytes) Explanation To get basic info on memory usage in our program, let us execute the following code in the NodeJs program and observe the output. After certain old space memory is allocated, expensive Garbage collection (Mark-Sweep and Mark-Compact) occur. Old Space: Objects which have survived two scavenge collections now are shifted from New space to Old Space and called Old Generation.New Space: The size of the new space is ~1–8MB and objects residing here are called New Generation.Heap is the biggest memory block dedicated to storing reference types like objects strings and closures where Garbage Collection (GC) takes place. HeapĪ memory segment where V8 stores objects or dynamic data. Static data including method, primitive values, and pointers defining control flow of the program and pointers to object in the heap are stored here. This is further divided into the following segments: The total memory allocated for program execution is Resident Set. Memory Management in NodeJs is done via V8 : ‘Google’s open-source high-performance JavaScript and WebAssembly engine ’. In JavaScript, as no interface is exposed to memory management, all the memory management is relinquished to the user. In C programming, developers need to take care of memory allocation and deallocation using malloc() and deallocate() functions. On the other hand, Manual Memory Management refers to the usage of instruction explicitly by programmers to deallocate the memory. The automatic accomplishment of freeing up memory occurs when these objects are considered not in use anymore, which is garbage collection, simply, destroying unused objects. An object when created uses memory which remains allocated until there are references for that object. It is the process by which the program performs automatic memory management by reclaiming the memory occupied by objects that are no longer used in the program. ![]() ![]() Arash the Archer (Source: Unsplash) Garbage Collection ![]()
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