On Tue, 29 Jan 2002 [EMAIL PROTECTED] wrote:
As far as I remember from reading the Lyons' book, there were
16 mapping descriptors for text and data each. I think, 1/16
of the address space is not too big, and in absolute values
it's the size of today's pages (4KB).
well I had dropped this
Once again Unix actually used this, the DEC OSes did not, so Unix was the
first to
find the bugs in this hardware too.
I think the first sentence is not true. The RT-11 XM monitor uses the MMU
hardware
intensively even before Unix came to utilize it. I'm not talking about
RSX-11, RSTS-E and
Ronald G Minnich wrote:
where'd they get this? that's an odd statement. Shared memory was used all
the time on Unix on -11s, that's the whole point of the shared text a.out
format. Of course shared read-only text is not exactly the standard shared
memory, but at the same time it shows
Justin C.Walker wrote:
On Monday, January 28, 2002, at 05:10 PM, Greg Shenaut wrote:
I'd guess that the point deals with the use of shared memory between
processes for the purposes of sharing data. Given the granularity of
the PDP-11 VM hardware, it seemed like a bad tradeoff, and
On Sat, 26 Jan 2002, Andrew Boothman wrote:
...
appendices is all about FreeBSD and its internals. It's 48 pages long
and is available from
http://www.wiley.com/college/silberschatz6e/0471417432/pdf/bsd.pdf
I like it. The dinosaur book has been a clasic forever. The
appendix
I've took a brief look on Unix presentation and was wondering, why author
says that ...most Unix systems have not permitted shared memory because
the PDP-11 hardware did not encourage it...?
Well, it wasn't so obvious deal with PDP-11 MMU, but why you have to tell to
your
students about it
On Mon, 28 Jan 2002, DOROVSKOY,IGOR (A-Portsmouth,ex1) wrote:
I've took a brief look on Unix presentation and was wondering, why author
says that ...most Unix systems have not permitted shared memory because
the PDP-11 hardware did not encourage it...?
where'd they get this? that's an odd
On Monday, January 28, 2002, at 02:49 PM, Ronald G Minnich wrote:
On Mon, 28 Jan 2002, DOROVSKOY,IGOR (A-Portsmouth,ex1) wrote:
I've took a brief look on Unix presentation and was wondering, why
author
says that ...most Unix systems have not permitted shared memory
because
the PDP-11
In message [EMAIL PROTECTED], Justin C.Walker cleopede:
I've took a brief look on Unix presentation and was wondering, why
author says that ...most Unix systems have not permitted shared
memory because the PDP-11 hardware did not encourage it...?
where'd they get this? that's an odd
On Monday, January 28, 2002, at 05:10 PM, Greg Shenaut wrote:
In message [EMAIL PROTECTED], Justin
C.Walker cleopede:
I've took a brief look on Unix presentation and was wondering, why
author says that ...most Unix systems have not permitted shared
memory because the PDP-11 hardware did
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