This command is used to check information about the RAM usage by your system. The latter is 8 bytes on a 64-bit system, which confirms that observed memory difference of 8 x 10 = 80MB makes sense. Method 1: The free command Since the free command is the most widely used and, without any doubt, the most helpful, we will mention its usage first. However, you could also use -b (bytes), -k (kibibytes), or -g (gibibytes).
In our example, we’ll use the -m (mebibytes) option. It also shows you the total amount of swap space configured, and how much is used and available.
#UBUNTU DISPLAY MEMORY USAGE CODE#
If you look at V8's source code ( Array::New, Heap::AllocateRawFixedArray, FixedArray::SizeFor), then you'll see that the memory used by an array is a fixed value plus the length multiplied by the size of a pointer. The free command gives you a table of the total, used, free, shared, buffer/cache, and available RAM on your computer. Free Vmstat Top Command Line Command: Free Free displays the total amount of free and used physical memory and swap space in the system, as well as the buffers and cache consumed by the kernel. In this simple example, you can see that allocating an array of 10M elements consumers approximately 80MB (take a look at heapUsed). Here is an example from in Node v0.12.2 on a 64-bit system: $ node -expose-gc
The built-in process module has a method memoryUsage that offers insight in the memory usage of the current Node.js process.
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