home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Amiga Plus 1995 #5 & #6
/
Amiga Plus CD - 1995 - No. 5 and 6.iso
/
pd
/
grafik
/
lightwave
/
lwml9505.txt
/
000185_owner-lightwave@webcom.com_Thu May 18 13:48:14 1995.msg
< prev
next >
Wrap
Internet Message Format
|
1995-06-03
|
5KB
Received: by webcom.com
(1.37.109.15/16.2) id AA008145795; Thu, 18 May 1995 09:49:56 -0700
Return-Path: <owner-lightwave@webcom.com>
Received: from oscar.FASTech.Com by webcom.com with SMTP
(1.37.109.15/16.2) id AA008035774; Thu, 18 May 1995 09:49:34 -0700
Received: from felix.fastech.com by oscar.FASTech.Com (4.1/SMI-4.1)
id AA05193; Thu, 18 May 95 12:53:30 EDT
Received: from cc:Mail by felix.fastech.com (1.30/SMTPLink)
id A08025; Thu, 18 May 95 12:53:30 EDT
Date: Thu, 18 May 95 12:53:30 EDT
From: Todd Aubin <taubin@FASTech.Com>
Message-Id: <9505181253.A08025@felix.fastech.com>
To: lightwave@webcom.com, t.taylor4@genie.geis.com
Subject: Re: PC: Update, dual P100 systems
Sender: owner-lightwave@webcom.com
Precedence: bulk
The problem here is that the test you ran is not a valid dual processor
test. A better test would be:
1) perform the same render again
while
2) run modeler and model a ball to the 2nd or 3rd level of
tesselation (spelling, sorry)
See modeler will run on cpu-A and the rendering will run on cpu-B.
lightwave does not contain parallel threads for execution. This is
readily apparent by the single executable. One of the nice items
in NT land is the DLL's. One process can have the DLL's already in
memory and save on the paging time.
Another note in the same area, from my personal experience installing
some multi-processor (supposedly SMP) boxes:
Three cpus are NOT 3 * x.
One cpu = 1.0
Two cpu = 1.9
Three cpu = 2.6
Four cpu = 3.4
There is an overhead incurred whenever you add another cpu, UNLESS the software
has been written to run on parrallel process.
and NO, I could name any one executable availble today that runs on multiple
pentiums, in parallel.
- todd
______________________________ Reply Separator _________________________________
Subject: PC: Update, dual P100 systems
Author: t.taylor4@genie.geis.com at felix
Date: 5/17/95 4:16 PM
Received: from felix.fastech.com by cc:Mail (1.30/SMTPLink)
>From owner-lightwave@webcom.com Wed 17 May 1995 22:25
X-Envelope-To: taubin@felix
Return-Path: <owner-lightwave@webcom.com>
Received: from oscar.FASTech.Com ([199.172.82.12]) by felix.fastech.com (SMT( id
id AA04315; Wed, 17 May 95 22:25:36 EDT
Received: by webcom.com
(1.37.109.15/16.2) id AA131158057; Wed, 17 May 1995 09:27:37 -0700
Received: from relay1.geis.com by webcom.com with ESMTP
(1.37.109.15/16.2) id AA128518008; Wed, 17 May 1995 09:27:04 -0700
Received: by relay1.geis.com
(1.37.109.11/15.6) id AA261588180; Wed, 17 May 1995 16:29:40 GMT
From: t.taylor4@genie.geis.com
Message-Id: <199505171629.AA261588180@relay1.geis.com>
Date: Wed, 17 May 95 16:16:00 UTC
To: lightwave@webcom.com
Subject: PC: Update, dual P100 systems
X-Genie-Id: 8948510
X-Genie-From: T.TAYLOR4
Sender: owner-lightwave@webcom.com
Precedence: bulk
Well, the tale gets stranger down the line....
A brief overview for all interested: Finally got my Dual Pentium
100mhz system here, working. I fire up Lightwave and get poor render
speeds. As a spoof, I powered down, disabled the second CPU
re-installed Windows NT (non multiprocessor version necessary)... and
better render speeds resulted!!
Texture's examples scene: All Trace functions ON
Medium Antialiasing
Adaptive Sampling = 18
Soft Filter ON
Medium Res
Amiga 4000/40mhz 1 CPU P5/100mhz 2 CPU P5/100mhz
12m55s (775) 4m47s (287) 6m6s (366)
Speed Index (Times faster than my A4000)
1 2.7 2.1
If anyone can figure this one out, I'd love to hear an explaination.
--
t.taylor4@genie.geis.com sent this message.
To Post a Message : lightwave@webcom.com
Un/Subscription Requests To : lightwave-request@webcom.com
(DIGEST) or : lightwave-digest-request@webcom.com
Administrative Items To : owner-lightwave@webcom.com
--
Todd Aubin <taubin@FASTech.Com> sent this message.
To Post a Message : lightwave@webcom.com
Un/Subscription Requests To : lightwave-request@webcom.com
(DIGEST) or : lightwave-digest-request@webcom.com
Administrative Items To : owner-lightwave@webcom.com