Path: utzoo!telly!attcan!seachg!jalsop
From: jalsop@seachg.uucp (John Alsop)
Newsgroups: comp.sys.ncr
Subject: Informix 4gl and C optimizer
Message-ID: <1990Dec14.035146.18882@seachg.uucp>
Date: 14 Dec 90 03:51:46 GMT
Reply-To: jalsop@seachg.UUCP (John Alsop)
Organization: Sea Change Corporation, Mississauga, Ontario, Canada
Lines: 29

I ran across an interesting problem today which might be of interest to
other Tower users.

A client has an application written in Informix 4GL.  It consists of 25
source modules, and takes about an hour to compile on another Unix box
comparable to the Tower. The compilation process involves generating C code
from the 4GL source, and then compiling the C into an executable.

The first try at compiling the application on a Tower 600 with 3.00.01 ran
for over 7 hours without finishing.  No-one was too impressed.

A brief analysis of the compilation of one of the modules showed that the
actual compilation from 4GL to C to assembler took about 45 seconds.  The
optimizer then started up and ran for about an hour!

Changing the default optimization level from 2 to 0 allowed all 25 modules to
be compiled in 40 minutes.

I'm curious as to why the code generated by Informix' 4GL should cause such
pathological behaviour of the optimizer.  Ideas anyone?

-- 
John Alsop

Sea Change Corporation
6695 Millcreek Drive, Unit 8
Mississauga, Ontario, Canada L5N 5R8
Tel: 416-542-9484 Fax: 416-542-9479
UUCP: ...!uunet!attcan!seachg!jalsop