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A Hitchhikers Guide to Troubleshooting Linux Memory Usage

Linux memory management has always intrigued me. While learning Linux, many concepts are confusing at first, but after a lot of reading, googling, understanding and determination, I learned that the kernel is not only efficient at memory management but also on par with artificial intelligence in making memory distribution decisions.. This post will hopefully show you how to troubleshoot or at least find out the amount of memory used by Linux and an application running on it. If you have any doubts, do let me know by commenting. Finding Linux System Memory usage One of the simplest way to check Linux system memory usage is with the “free” command. Below is my “free -­m” command output. The first line shows you that my free memory is only 111MB but the trick here is to look at the second line for free memory. The first line calculates caches and buffers along with the used memory. Now linux does cache data to speed up the process of loading content. But, that cached memory is also available for a new process to use at any time and can be freed by the kernel immediately, in case any of your processes need it. Buffers on the other hand, store metadata like file permissions or memory location of the cached data. Since this physical memory is availble for our process to use, we can subtract this information from the used memory to give us a free memory of 305MB as seen in the figure above. Memory caching or Page cache Linux divides memory into blocks called pages and […]

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UBUNTU CHEAT SHEET!

As most of you all know, I am a huge proponent of Ubuntu. I even make my own version of Ubuntu Linux (Newest version posts tomorrow!). Some of you though are new to Ubuntu Linux, or even Debian Linux from which Ubuntu is based. For the most part, If you are just casually using the […]

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Prototyping Design Tutorial Roundup: Best Video Tutorials

In general, pen and paper prototyping is most often used to display conceptions in the product development process. Which processes simply and rapidly with a brief sketch. But you still have a lot of work to do, if you want to get the wireframes to be more perfect. On YouTube, somebody shows a paper-based prototype […]

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COMMON LINUX COMMANDS

Open-source Linux is a popular alternative to Microsoft Windows, and if you choose to use this low-cost or free operating system, you need to know some basic Linux commands to make your system smoothly. The most common Linux commands are shown in this table. Command Description cat [filename] Display file’s contents to the standard output […]

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