RE: 64-bit

["Steve Richter" <srichter@xxxxxxxxxxxxx>]

The very real advantage to >64 bits is that the 16meg size limit on a space
can be increased.

Currently the 8 byte address is divided as a 5 byte segment number and a 3
byte offset. If 128 bits, the division could be 8 byte segment and 8 byte
offset. It is the offset that limits the size of the segment/space.

Many ask "why do you need a larger than 16meg space" ?.   One function is
the saving of the state of a program.  Copy the the allocated memory of a
job to disk, shut down the job, then at a later time, start another job back
up, copy the state of the original job to the new job, and resume running.
Makes a nice debug feature.

Doing this with 16meg segments is tough because the segments of the renewed
state job will have different segment addresses ( the 5 byte segment
number ) and pointers that were valid in the original job will no longer be
so.

The same reasoning applies to saving a large pgm data structure to a perm
disk object and restoring it later for use by another job.


Steve Richter

-----Original Message-----
From: midrange-l-admin@midrange.com
[mailto:midrange-l-admin@midrange.com]On Behalf Of Raikov, Lo
Sent: Thursday, March 21, 2002 8:43 PM
To: 'midrange-l@midrange.com'
Subject: RE: 64-bit


I'd say imagination is irrelevant here. I (you) can surely imagine a lot,
but until we are given a comprehensive set of tools (APIs, functions,
methods) to navigate the 64-bit space, we (I agree on this point) are doomed
to stay 16-bit animals dreaming of the open spaces but gravitationally
chained to the mother Earth. With 3rd generation languages we most
definitely are.

Lo

-----Original Message-----
From: Leif Svalgaard [mailto:leif@leif.org]
Sent: 22 ????? 2002 ?. 12:30
To: midrange-l@midrange.com
Subject: Re: 64-bit


From: Raikov, Lo <Lo.Raikov@MISYS.COM>
> even if you are given a chance to explore 64-bit data space, what can you
> meaningfully do with it? Low-level tweaking (e.g. sort) does not really
> count.
>

address space is like money and sex, you can't get too much.
Our (your?) imagination what you can  do is still 16-bit.


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