NewAutoTester: Is this error coming from the Linux or Windows machine?
On your Linux machine, setting the memory values to 4096 means you are allowing ReadyAPI to use ALL of your available RAM. It will not be able to do that, since the OS and other applications will need to use some RAM as well.
On the Windows machine, I'd say you could safely set that value to 12288 instead of 4096 to see if it fares any better. That would be 75% of your 16GB of RAM which might work better for you. My testing machine has 32GB of RAM and I set my memory to 24576.
