Scyld & linpack

David Vos dvos12 at calvin.edu
Sun Apr 8 16:02:51 EDT 2001


Oops.  I hadn't realized that 'linpack' was a shell script.  Thanks.

David

On Sat, 7 Apr 2001, Rick Niles wrote:

> 
> > First of all, where are the source rpms so I can compile them for my
> > architecture?
> 
> ftp://ftp.scyld.com/pub/beowulf/27BZ-7/SRPMS/hpl-1.0-1.src.rpm
> 
> They were actually missing.  Sorry about that I just put it there.
> 
> > There is no documentation on them.  
> 
> 124 of the 127 files in the hpl RPM are HPL man pages.
> 
> > Do they take any command lines?
> 
> I think you mean does the "linpack" shell script take any arguments.
> No it's very simple and stupid.
> 
> > xhpl needs HPL.dat to run.  
> 
> Yes. The "linpack" script create it in "/tmp" on the fly.  The script
> can give you a good start on what the file format should look like.
> 
> > Where do I need to put this file?
> 
> Annoyingly, it has to be in the same directory as the execuable.  That's
> why I copy both in to "/tmp" before running.
> 
> > Would 'linpack' also use this file if it existed?  
> 
> No it creates it's own.  I'm happy to take patches to improve the complete
> simplicity/stupidity of the current script.
> 
> > Is this running on the cluster at large?  
> 
> Yes. It counts the number of CPUs an then runs that many ranks.
> 
> Most of these questions can be answered by just reading the 48 line
> "linpack" shell script.
> 
> > How do I make it run on just one/all machines?
> 
> Copy the script and modify it.
> 
> Add a line after the two "NCPUS" computation lines to force it a
> certain value, like "NCPUS=4".
> 
> Also, I highly recommend playing with different dimensions.  Since I
> wanted a simple script I always use a dimension of (1 x NCPUS) which
> is far from ideal for most configurations.  See the HPL home page for
> for information.
> 
> > /home/redhat/BUILD/glibc-2.1.3/elf/dlerror.c:152: undefined reference to `bproc_currnode'
> 
> In general, if you get this kind of link time problem building a package
> that's looking for "bproc" something you need to add "-lbproc" to the
> link line so that it includes the bproc library.
> 
> I hope this helps,
> 
> 	Rick Niles
> 	Scyld Computing Corporation
> 
> 


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