On Tue, Apr 23, 2002 at 09:40:11PM -0700, David Schultz <[EMAIL PROTECTED]> wrote:
> > Userspace processes will allocate memory from UVA space and can > > grow over 1GB of size if needed by swapping. You can certainly > > have more than one over-1GB process going on at the same time, > > but swapping will constrain your performance. > > It isn't a performance constraint. 32-bit architectures have > 32-bit pointers, so in the absence of segmentation tricks, a > virtual address space can only contain 2^32 = 4G locations. If > the kernel gets 3 GB of that, the maximum amount of memory that > any individual user process can use is 1 GB. If you had, say, 4 > GB of physical memory, a single user process could not use it all. > Swap increases the total amount of memory that *all* processes can > allocate by pushing some of the pages out of RAM and onto the > disk, but it doesn't increase the total amount of memory that a > single process can address. Thank you, Terry and David, now I grasp how it should work (I hope). I really miss some education, but that's life. -- Vallo Kallaste [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
