As the name implies, this file system stores temporary files to speed up operations on your computer. Shared: This column displays the amount of memory dedicated to tmpfs, “temporary file storage”. As you can see in our example output above, our test machine has a measly 145 MB of memory that is totally free. There should ordinarily be a pretty small number here, since Linux uses most of the free RAM for buffers and caches, rather than letting it sit completely idle.
The number in this column is the sum of total-free-buffers-cache.įree: This column lists the amount of memory that is completely unutilized. This makes read and write operations more efficient, but the kernel will reallocate that memory if a process needs it. While the “used” column does represent RAM which is currently in use by the various programs on a system, it also adds in the RAM which the kernel is using for buffering and caching. Just because memory is “in use” doesn’t necessarily mean that any process or application is actively utilizing it. Used: This column lists the amount of memory that is currently in use – but wait, that’s not quite as intuitive as it sounds. Total: This column is obvious – it shows how much RAM is physically installed in your system, as well as the size of the swap file. Let’s break down the details represented in all of these columns, since the terminology here gets a little confusing. This output tells us that our system has about 2 GB of physical memory, and about 1 GB of swap memory. Now the values are much clearer, even with a brief glance. The -h switch, which stands for “human readable”, helps us make more sense of the output:
That’s chiefly because the output is given in kibibytes by default. The clinic function starts the diagnostic tools and returns a URL where we can access the diagnostic reports.īy using the node-clinic-diagnostics library, we can easily monitor and optimize the CPU and memory usage of Node processes.Total used free shared buff/cache available We then call the clinic function with the options object and a callback function. The memory object specifies a memory limit of 1GB.
The cpu object specifies a CPU limit of 80% and checks the CPU usage every second. We then define an options object that specifies the CPU and memory limits for the Node process. In this code snippet, we first require the clinic module from the node-clinic-diagnostics library.
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