Basic Guide to Testing Memory in Ubuntu

What is Memtest86+?

Functioning outside of the operating system is necessary because it frees up almost all of the memory that would have been in-use by the operating system; this enables the software to examine as much of the memory as possible. Memtest86+ is included by default in Ubuntu installations as well as other major distributions of Linux. If Memtest has not been included in your distribution of Linux, then you can use a USB thumbdrive to create a portable test drive to boot from and run the test.

To create a bootable drive, (Do this if you do not have access to the GRUB menu, or if your motherboard does not have legacy support).

How Do I Access Memtest on My Ubuntu System?

Running Memtest on a system that has Ubuntu installed is a relatively easy task to perform with only a couple of steps to take. Since Memtest86+ runs without an operating system, you will have to access the GRUB menu. You can do this by holding down the “Shift” key while the system is starting up. Memtest should appear in the list of options. Use the arrow keys on the keyboard to highlight the “Memtest86+” option and press the “Enter” key. Memtest should boot up right way and start running.

Okay, Memtest Is Running, Now What?

Now that we have successfully gotten Memtest up and running, we play the waiting game to see if any errors are detected or if the system restarts. Ideally, we would want to run Memtest for as many passes as time allows as these errors can be intermittent and an error might not appear until a second pass. Each pass can take anywhere from a couple of hours to several days depending on how much memory is installed in the system. This is why we recommend that our customers run the test at the end of the day and to allow it to run at least through the night. If your system has a lot of memory, and if the crashing is infrequent, it may be worthwhile to just run it over the weekend. If you have ECC (Error-correcting code) memory, then you can get by with doing only one pass if you are in a time crunch as it will generally correct errors on its own; however, if you have the time to perform a second pass then we would recommend that you do so.

The first step would be to reseat your memory and run the test again. This will often clear any errors and crashing that you were experiencing. If you run Memtest a second time and still receive errors, then it is likely that you have one or more memory sticks that are faulty and need to be replaced.

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