I have to build a simulator, to check the scalability limits in memory
management of linux. For this, the simulator will provide a large amount of
RAM (in GBs), even if the amount of physical memory is only 512MB.
Can UML be used for this purpose? I had seen the "mem" option in the kernel
switches option of UML. Can UML simulate such a case? If it does, how UML
handles this? Specifically, can the UML kernel allocate all this amount of
memory (leaving aside the page faults which will be generated in case of
read/write requests to the allocated pages, for it has to use the actual
RAM)? Say, for example if I allocate 4 GB, will the UML kernel allocate all
the amount in the simulated RAM. (maybe it does it in the some swap, or the
/tmp, as the documentation says for the "mem" usage
<http://user-mode-linux.sourceforge.net/switches.html> > .
If I have wrong interpretation of the "mem" option in UML, please do correct