Hi,
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 amout 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 me.
TIA, Vaibhav
Mr. Sharma,
What you are trying to do will work, but not for large amounts of memory. UML runs the client using a single user mode memory block as the entire client's core. Thus the clients core size is limited to what a single task can allocate as plain memory. With x86 architechure cpus, this is 2G or 3G depending on how you build a kernel (but usually 2G). There are no paging mechanism here so there is no way to make it "gigabytes"
Others can correct me if I have the exact numbers wrong.
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