On Thursday, October 31, 2002, at 09:22 PM, Jeremy T. Fox wrote: I tried to find the most memory I could allocate via Fortran (g77) and I got 2.25GB (on a G4 with 512MB of physical memory). Does Mac OS X have a limit of 2.25GB per process, or is this something strange with Fortran and/or my machine? For comparison, Windows has a limit of 2GB per process (tunable to 3GB if you shell out for Advanced Server), while I believe the default on Linux is 3GB, which can be upgraded to 3.5GB with the right patch. I don't know about FreeBSD. Clearly 64-bit machines do not have this type of limitation. Jeremy, who hopes that one day Apple will support 1GB DIMMs :) If you're curious where everything gets mapped, try out vmmap(1). For instance, on my machine, a process running a bash shell has the malloc region starting at 0x8a000, dyld at 0x8fe00000, and the stack is at 0xbffff000. Just doing the numbers on the contiguous malloc region says it's about 2.25 GB. Mind you, just mucking with a little bit of C code and vmmap, malloc will allocate outside that region, provided you're not after contiguous allocations. My routine stopped at a little under 3.5 GB. Mind you, I didn't touch any of the pages... Cheers, -- Paul Ripke Unix/OpenVMS/DBA 101 reasons why you can't find your Sysadmin: 67: It's 9AM and they're not working that late. -- Koos van den Hout _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.