CCL:Linux on PowerPC (fwd)

[Eugene Leitl]

---------- Forwarded message ----------
Date: Thu, 19 Apr 2001 08:49:42 +0200
From: Christoph van Wüllen <Christoph.vanWullen at tu-berlin.de>
To: Yubo Fan <yubofan at mail.chem.tamu.edu>
Cc: chemistry at ccl.net
Subject: CCL:Linux on PowerPC


>computers can run Linux OS. PowerPC processor is much more powerful than
>PC chips in scientific calculations, at least Apple's ads said so. My
>question is: Can G98 run on SuSe Linux-Apple combination?

This depends on the quality of the compiler. My timings for a small
TURBOMOLE test suite are

Mac/g77       (29. 08. 99)   532 user  37 sys 0:10 real             G3 400 MHz
unibo13/g77   (22. 09. 99)   445 user  28 sys 0:41 real           Piii 500 MHz
CvW/PGI       (28. 09. 99)   320 user  16 sys 0:06 real           Piii 500 MHz
Gadolinium    (30. 03. 01)   178 user  29 sys 0:04 real           Piii 850 MHz
Achilleus/PGI (29. 03. 01)   161 user  11 sys 0:03 real         Athlon 900 MHz

That is, a G3 and Pentium-iii are similar at the same clock speed. The PGI
compiler for pentium gives 30 percent, and modern PCs at 900 MHz outperform
a G3-400 MHz by a factor of 3.3. Unless you have a FORTRAN compiler that
exploits the new G4 architecture, I cannot see why a PowerPC should be faster
than a Pentium. I love my Macintosh on my desk, but for doing computations....

-- 
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