swapping in IRIX 3.2 -- how does it work?

[Jason Heirtzler]

Can someone explain how swapping works in IRIX 3.2?

It doesn't look like swap space is being allocated on the disk
until it's actually necessary to swap a process out.  This seems
different than 4.{2,3} BSD, which wants to allocate space on the
swapping device as you allocate physical memory.  No?

        # /etc/swap -l
        path               dev  swaplo blocks   free
        /dev/dsk/dks0d1s1 22,33      0 102256 102256
        /dev/dsk/dks0d2s0 22,64      0 102256 102256

Does IRIX interleave swapping between multiple disks to take full
advantage of the increase in I/O that is possible?

jdh

-------------------------------------------------------------------------
Jason Heirtzler           (617) 353-2780       jdh at bu-pub.bu.edu
Information Technology    Boston University    ..!harvard!bu-cs!bu-it!jdh