I've written a program for a class that my professor will be testing in various low memory environments to see how it behaves when the program runs out of memory. Is there a way I can simulate the execution in a low memory environment without creating a virtual machine?
You'll want to use ulimit
ulimit can be used to limit memory utilization (among other things)
Here is an example of setting memory usage so low that
/bin/ls(which is larger than
/bin/cat) no longer works, but
$ ls -lh /bin/ls /bin/cat -rwxr-xr-x 1 root root 25K May 24 2008 /bin/cat -rwxr-xr-x 1 root root 88K May 24 2008 /bin/ls $ date > test.txt $ ulimit -d 10000 -m 10000 -v 10000 $ /bin/ls date.txt /bin/ls: error while loading shared libraries: libc.so.6: failed to map segment from shared object: Cannot allocate memory $ /bin/cat date.txt Thu Mar 26 11:51:16 PDT 2009 $
Note: If I set the limits to 1000 kilobytes, neither program works, because they load libraries, which increase their size. above 1000 KB.
-d data segment size
-m max memory size
-v virtual memory size
Run ulimit -a to see all the resource caps ulimits can set.