fast mapcalc

>
>>OK smart fellas, show me! Name four major commercial Unix systems with
>>"ram-disk" and specifics about mounting procedures.

I just made a quick check on my DEC Alpha running OSF/1 3.0. It apparently
supports a memory file system as well. I've never used it, but now my
curiousity is piqued - I'll give this a shot and see if I can do faster
process sequences.

Quoting from man page

/usr/sbin/mfs [-F mount-flags] [newfs-options] [special-device] mount-node

  The mfs command builds a memory file system (mfs), which is a UFS file sys-
  tem in virtual memory, and mounts it on the specified mount-node. When the
  file system is unmounted, mfs exits and the contents of the file system are
  lost. If mfs is sent a signal while running, for example during system
  shutdown, it attempts to unmount its corresponding file system. The param-
  eters for mfs are almost the same as those for newfs. For a memory file
  system, the special-device file provides only a set of configuration param-
  eters, including the size of the virtual memory segment to allocate. If
  the special-device file is omitted, you must specify the segment size. The
  special-device file is usually the primary swap area, because that is where
  the file system is backed up when free memory gets low and the memory sup-
  porting the file system has to be paged.

  You can enable /tmp as a memory file system by adding an entry in the
  /etc/fstab file. For example, the following line creates a 10 Megabyte
  memory file system, mounted on /tmp:

       -s20480 /tmp mfs rw 1 0

  Note that the contents of a memory file system are lost whenever a reboot
  or unmount is performed.

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