Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!mcnc!rti!xyzzy!aquila!harrism
From: harrism@aquila.rtp.dg.com (Mike Harris)
Newsgroups: comp.databases
Subject: Re: Client/Server processes and implementations
Message-ID: <990@xyzzy.UUCP>
Date: 6 Dec 89 16:07:50 GMT
References: <1989Nov29.224606.19358@odi.com> <713@xyzzy.UUCP>
Sender: usenet@xyzzy.UUCP
Reply-To: harrism@aquila.rtp.dg.com (Mike Harris)
Distribution: usa
Organization: Data General Corporation, Research Triangle Park, NC
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In article <1989Nov29.224606.19358@odi.com>, dlw@odi.com (Dan Weinreb) writes:
: In article <713@xyzzy.UUCP> harrism@aquila.rtp.dg.com (Mike Harris) writes:
: 
:>    [locking and synchronizations issues ] 

: ....[When you say "an MP style architecture is required", I'm not sure 
: precisely what you mean]
: 
: Is it an MP style architecture if you have a LWP package running
: inside a single O/S process, and the LWP is the conventional kind
: such as SunOS currently provides, and that you can easily write yourself?

I am not familiar with their package. The following should clarify, however..
: 
: Is it an MP style architecture if you have a LWP package running
: inside a single O/S process, and the LWP is the kind provided by the
: operating system that is capable of running many of the LWPs at the
: same time on distinct processors of a coarse-grained multiprocessor
: system, such as Sequent provides?
: 

Yes.

: Or do you mean an architecture in which there are many different
: operating system processes, each with its own address space, running
: on the same database?

Yes, although "the same database" is not necessarily relevant.

: 
: Or do you mean it is required that many different machines (not a
: multiprocessor computer but many machines, connected by a LAN or
: something like that) be able to all directly acts as servers for the
: same database?

No. I was primarily refering to tightly coupled multi processing on single or
tightly coupled multi processors (same memory store, etc). The issues for
database/application partitioning for effective use of loosly coupled
processors
are equally as interesting.

: Dan Weinreb		Object Design		dlw@odi.com

regards,

Mike Harris - KM4UL                      harrism@dg-rtp.dg.com
Data General Corporation                 {world}!mcnc!rti!dg-rtp!harrism
Research Triangle Park, NC