title: Testing free memory on Debian
body: <p>On my Virtual Server running Debian, I have impression, that there is wrongly configured memory, even though my provider claims everything works correctly.</p>
  
  <p>Even with 3GB of RAM, I keep running out of memory, even though top commands claims it still has enough memory.</p>
  
  <p>Is there a way to test, that the free memory is actually usable? For instance, if I had 1,5 GB of memory, I would like to create a block of 1 GB and see that everything still works correctly.</p>
  
  <p>Thanks,</p>