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I have spent awhile looking for a memory testing tool that works from the command line, and have been unable to find anything besides memtester (http://pyropus.ca/software/memtester/).

Eventually the memory test will be part of a larger stress test, so somethig that runs without an OS (Like memtest86 or memtest86+) will not work here.

Is memtester the only such utility?

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    I'm not sure but this utility might not be able to test all the memory since it runs in userspace. Kernel/hardware reserved memory might not be accessible to this utility. – piernov Jul 21 '14 at 22:49
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I'm not sure why you would want to stress test a loaded system. Perhaps you are trying to test how well a particular program/system runs?

If you really want to do a memory test, you're better off doing it from a dedicated boot device (boot cd, usb key, etc). One popular offering is Ultimate Boot CD.

If you really, really want to do it on a running system then maybe one of the memory tools within that CD has a userspace port (I doubt it). If instead you just want a system that is being stressed tested, I'd direct you to look at stress. Other ideas can be found on this question.

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