fast mapcalc

David Wheatley D.W.Wheatley at
Mon Jul 3 08:00:00 EDT 1995

>>Most Unix workstations allow you to define a ram-disk.  If you have enough 
>>RAM you can copy your location to the ram-disk and then run grass normally.
>>Jim Hinthorne              Voice:  509-963-2826
>Ram-disk? ... Unix?
>I'm sorry.  I've only been playing on Unix since about 1983, a short
>timer, and *do not* claim to be a guru, but I  have never heard of
>such a thing as "ram-disk" mentioned in the same breath as Unix.
>I know there are a few new things out there, but this one does not
>make any sense to me.  Unix does a lot of things with available ram
>and stacks up a lot of disk I/O in memory, but ... .
>Did we mistype DOS?

This is rubbish: exactly the kind of half-witted mis-information which gives
newsgroups a bad name.

Some (if not all) unices DO in fact allow 'ram-disks' or whatever you want to
call it. Slakware LINUX, for example, relies on this feature in order to instal
itself. In case any true unix anoraks want to know how to do it, you mount 
it like any other disk with an entry in /etc/fstab something like this:

# device        directory       type    options         freq pass
/dev/ramdisk    /ramdisk        ext2    defaults

to find out if your flavour of UNIX can do this, check to see if the device
driver /dev/ramdisk (or something like it) exists. If it does then you can.

Of course you DO need to be root in order to mount a partition, so this
might not be the correct solution to the original question ...
David Wheatley
Department of Archaeology
University of Southampton
SO17 1BJ

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