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Date: Wed, 25 Mar 1998 14:18:16 -0300
From: JORGE HERNANDO <hernando AT cnea DOT edu DOT ar>
Message-Id: <199803251718.OAA20379@cnea.edu.ar>
To: beastium-list AT Desk DOT nl
Subject: pg77 speed
Sender: Marc Lehmann <pcg AT goof DOT com>
Status: RO
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Content-Length: 1417
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  Hi:

      Jochen Heyd <jheyd AT tech DOT chem DOT ethz DOT ch> wrote

< after trying pgcc on one quantum chemistry code and getting speed
< improvements of about 40% (almost all it does is floating point
< arithmetic), I also wanted to recompile another one. During the course

    Impressive!! I've recently joined the mailing list because I wanted 
to know how pg77 improved on fp intensive tasks. I'm a physicist
who runs MC or MD numerical simulations, so we are the same kind of
birds. A couple of questions:

1) Are you using the new glibc or the old one (libc-5.4.xx)?

2) Did you get the 40% improvement on another programs?

3) have you tried to link pg77 executables with g77 ones?
                                                        
    A couple of libc-related questions 

-  Does anybody out there know if libc-5.4.33 is good enough to run
pgcc? In the FAQ it is recommended                       

      "3.5 ..... libc-5.4.22,5.4.43 or higher"     5.4.33???

-  In case that an actualization is needed, how can I make a
safe updating? I'm a bit scared of ending up with an unusable machine,
libc is really in the system's core  

Lastly, a suggestion for the FAQ: I think that it would be quite
useful (for people like me) if together with the installation procedure
 the updating  for libc (binutils?) is briefly described.
                             

J. Hernando
Physics Dept., CNEA
hernando AT cnea DOT edu DOT ar