Hello, TM> Another question is : Can we run run many VM using more RAM than the TM> RAM installed (on the workstation)? For example I'd like to create 5 TM> VM's who have 256MB (can use 256MB but only for a slice of time) but TM> normally one VM use only 50MB. On the workstation I have only 512MB TM> RAM. Is it possible to create these VM's or have we to have 5 X 256 TM> RAM + HOST RAM = 1.5 GB installed on the workstation?
TM> I think we can save ressource by using RAM overcomittment. What do TM> you think? Is this implemented on qemu? Or will be implemented? It seems to me that no change to QEMU is needed for this; it should already be supported by your host OS. Simply allocate the memory that you want (256mb, for example) for each virtual machine. Depending on how many virtual machines you have open at once, as well as the memory used by the host OS and any other applications you're running, the host OS will fit the as much as it can in the physical ram, and automatically swap out the excess allocated memory to disk. However, swapping (using virtual memory) will be a huge performance killer. It will affect the performance of your host OS and all applications, as well as for your QEMU instances. -- James Funny quotes: "There are 10 types of people in the world. Those who understand binary, and those who don't." -- Unknown "A computer once beat me at chess, but it was no match for me at kick boxing." -- Emo Philips _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel