How to check for errors in RAM via Ubuntu?

I have Ubuntu 11 running off a 3.6GB USB flash/stick drive. System has 4GB RAM and blank hard disk (wiped using DBAN tool).

How do I check if there are no errors in my RAM? Is there a guaranteed way to check that via some Linux command? If not, it would be great to know why.

Solution 1:

By installing the memtester package, you can check your system for errors while it's still running. No need for a restart, just run that application.

To install it, open a terminal and type:

sudo apt install memtester

You can then use it like so:

sudo memtester 1024 5

This should allocate 1024MB of memory, and repeat the test 5 times.

Update

• If you have more RAM like 4GB or 8GB, it is upto you how much memory you want to allocate for testing.
• As your operating system, current running process might take some amount of RAM, Please check available Free RAM and assign that too memtester.
• If you are using a 32 Bit System, you cant test more than 4 GB even though you have more RAM( 32 bit systems doesnt support more than 3.5 GB RAM as you all know).
• If your system is very busy and you still assigned higher than available amount of RAM, then the test might get your system into a deadlock, leads to system to halt, be aware of this.
• Run the memtester as root user, so that memtester process can malloc the memory, once its gets hold on that memory it will try to apply lock. if specified memory is not available, it will try to reduce required RAM automatically and try to lock it with mlock.
• if you run it as a regular user, it cant auto reduce the required amount of RAM, so it cant lock it, so it tries to get hold on that specified memory and starts exhausting all system resources.

Hope this helps.

Solution 2:

The Ubuntu Live CD includes a tool called Memtest86+ that will do just that—test your computer’s RAM. Boot up from the Ubuntu LiveCD, press and hold the Shift key, which will bring up the GRUB menu. Select Memory Test

Solution 3:

I have found mprime to be a good tool to test memory: ftp://mersenne.org/gimps/

(mprime can also be used to stress test your CPU)

Alternatively, use the package stress-ng to run all kind of stress tests (including memory test) on your machine.