On Sunday 23 January 2005 10:51, Rob Landley wrote: > On Sunday 23 January 2005 03:28 am, Doug Dumitru wrote: > > 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. > > UML uses mmap (generally of a /tmp file) as physical memory. This can be > way bigger than physical memory on the machine, sure, and the parent kernel > will transparently use the mmaped file as backing store, demand paged and > all that. (Just like it would for any other application.) > > You could run out of virtual address space, though. Trying to map more > than a few gigabytes on a 32 bit machine is unlikely to work. > > Might I suggest buying a cheap x86-64 system (you can get 'em at Fry's a > couple hundred bucks), feed it a cheap 300 gigabyte IDE drive, and have > fun.
This is not (yet) exactly supported... a lot of work is going on this, and somebody was even able to compile and run (successfully?) some x86_64 umls... However, consider it still as a developer-only tool for now. 2.6.11 could effectively be a good x86_64 tree, but do not yet use it for anything critical. Clearly, 32-bit UMLs run well on x86_64 boxes, but don't have the 64-bit advantages... -- Paolo Giarrusso, aka Blaisorblade Linux registered user n. 292729 http://www.user-mode-linux.org/~blaisorblade ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
