Re: Info request: Amber on 64-bit CPUs

From: Chuck Schneider <>
Date: Tue, 25 Feb 2003 10:02:49 -0500

Dr. Svozil asked about compilability of AMBER 7 on 64-bit architectures.
My vested interest in the subject is obvious, but I think I can offer
some objective information:

For Alpha, there will be no trouble on Tru64. I expect the same for
Linux, assuming Compaq Fortran is used - I have done this build, though
not recently. I would be very surprised if any trouble were found on
OpenVMS, but I don't speak from experience in that case.

For Itanium 2, running Linux with Intel compilers, I and others have
encountered trouble (run-time errors) using -O3 optimization, but
success using -O2.

One option not specifically mentioned by Dr. Svozil is Itanium 2
running HP-UX. The HP compilers are 64-bit, and will build AMBER
with no trouble.


Chuck Schneider
Hewlett-Packard Company
High Performance Computing Expertise Center
Marlboro, Massachusetts  508-467-7343
Received on Tue Feb 25 2003 - 15:53:00 PST
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