Path: utzoo!attcan!uunet!wuarchive!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!dsinc!netnews.upenn.edu!cps3xx!usenet
From: usenet@cps3xx.UUCP (Usenet file owner)
Newsgroups: comp.unix.xenix
Subject: Re: Programs compiled under xenix run slower under unix?
Message-ID: <6694@cps3xx.UUCP>
Date: 1 Mar 90 18:33:37 GMT
References: <2750@scorn.sco.COM>
Organization: Engineering, Michigan State U., E. Lansing MI
Lines: 27

From article <2750@scorn.sco.COM>, by rogerk@sco.COM (Roger Knopf 5502):
$ 
$ In article <57@dynasys.UUCP> jessea@dynasys.UUCP (Jesse W. Asher) writes:
$>I was wondering if programs compiled under unix and then moved to
$>a unix system would run slower than if they had been compiled
$>under the unix system.  I'm not asking if a program will run
$>slower or faster on a unix or xenix system.  What I'm asking really
$>is "Does the process of translating xenix programs on a unix system
$>slow the program down?"  I was going to give someone a program I 
$>had compiled on a xenix system, but he refused it saying that he
$>wanted to compile it on his system (unix) because the program
$>would run slower.  It this true?  Thanx in advance.

From some experiments I did when I first got SCO UNIX the answer to 
the last question is YES.

The reason for this appears to be more compiler specific than OS
specific. I found that binaries I generated under XENIX 386/2.3.2 ran 
slower under UNIX than Xenix. When the same program was compiled under
UNIX and created either a Xenix or a UNIX binary it ran faster un
UNIX than the one compiled under Xenix. I believe this is more
because of improvements in the compiler from MSC v4.0 to MSC v5.1.

j                               |%|John Lawitzke, Dale Computer Corp., R&D
                                |%|UUCP: uunet!frith!dale1!jhl         Work
                                |%|      uunet!frith!ipecac!jhl        Home
Inquiring minds just wondering. |%|Internet: jhl@frith.egr.msu.edu