[Beowulf] g77 limits...

Joel Jaeggli joelja at darkwing.uoregon.edu
Wed Feb 22 17:35:52 EST 2006


On Wed, 22 Feb 2006, Kozin, I (Igor) wrote:

>
>>> archives because it is so time dependent an answer.  In particular, can
>>> an x64 box with a modern linux kernel and a modern g77 allocate 4-8 GB
>>
>> isn't "modern g77" a bit of an oxymoron?
>> (given the existence of gfortran, I mean).
>
> Oh, I was totally confused by the combination "g77" and "allocate".
>
> Robert, try g95. Although it is not part of the gnu stream but
> it seems more stable at the moment. It works stand alone.
> Allocating (nearly) 4GB in a single array worked for me
> (unfortunately no more physical memory is available).
> However in terms of performance you may lose considerably
> compared to commercial compilers.

g95 is included as of gcc 4 you can try it out on fc4 if you're so 
inclinded...

[joelja at twin ~]$ gcc -v
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man 
--infodir=/usr/share/info --enable-shared --enable-threads=posix 
--enable-checking=release --with-system-zlib --enable-__cxa_atexit 
--disable-libunwind-exceptions --enable-libgcj-multifile 
--enable-languages=c,c++,objc,java,f95,ada --enable-java-awt=gtk 
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre 
--host=i386-redhat-linux
Thread model: posix
gcc version 4.0.2 20051125 (Red Hat 4.0.2-8)
You have mail in /var/spool/mail/joelja


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Joel Jaeggli  	       Unix Consulting 	       joelja at darkwing.uoregon.edu
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