Can I run test my program with less memory then I have?

tfnc99 · 04-13-2013, 08:35 PM

OK so I have been wanting to test some of my programs to see how well they can handle running in low memory situations and
such, and VM, allocating a lot of memory at start, etc. Seem unreliable, are there any tools to do this? Can I do this with
gdb?

I am using plain c with gcc. I am on ARM if that matters. Debian Wheezy

syg00 · 04-13-2013, 09:29 PM

Not sure if this what you are looking for (or if it applies to ARM, although I reckon it should), but you can limit the memory the kernel "sees" at boot. see here.

konsolebox · 04-14-2013, 05:18 AM

Or perhaps run it on a virtual environment like VirtualBox.

NevemTeve · 04-14-2013, 05:54 AM

You could also try ulimit -v <size_in_KB> before running the program

tfnc99 · 04-14-2013, 02:36 PM

Is there a way to tell how much memory the system is using idling? So I know what to set ulimit to.
Also does ulimit take swap into account?

konsolebox · 04-14-2013, 07:58 PM

Quote:

Originally Posted by tfnc99

Is there a way to tell how much memory the system is using idling? So I know what to set ulimit to.
Also does ulimit take swap into account?

Just run top and estimate I guess. If there's enough memory why would it?

NevemTeve · 04-15-2013, 02:54 AM

> So I know what to set ulimit to.

Just try different values, and you will find out how much is required to run your program.