[Beowulf] Gentoo in the HPC environment

[Skylar Thompson]

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On 06/30/2014 05:34 PM, Christopher Samuel wrote:
> On 01/07/14 10:27, Christopher Samuel wrote:
> 
>> then all the applications are in /usr/local
> 
> To quickly qualify that, our naming scheme is:
> 
> /usr/local/$application/$version-$compiler/
> 
> We name modules as:
> 
> $application-$compiler/$version
> 
> so someone can do:
> 
> module load gromacs-intel
> 
> and get the latest version of Gromacs built with the Intel
> compilers.
> 
> Then we can do these tricks like pull values out in relatively
> generic module files thus:
> 
> [...] set ver [lrange [split [ module-info name ] / ] 1 1 ] set
> name [lrange [split [ module-info name ] / ] 0 0 ] set subname
> [lrange [split $name - ] 0 0 ] set compiler [lrange [split $name -
> ] 1 1 ]
> 
> if { ![ is-loaded $compiler ] } { module load $compiler }
> 
> prepend-path PATH /usr/local/$subname/$ver-$compiler/bin [...]
> 
> :-)

We do something similar, although split our software up into
"OS/distro/ISA" (i.e. Linux/RHEL4/i686) just to keep maximum
flexibility. That path suffix is configured in the $ARCHPATH variable
so that it's not really any extra overhead to any of the tools.

One of the really cool things about Modules is the power of Tcl - it's
allowed us to make our basic Module files no more than a couple lines
long, with most of the functionality computed on the fly in a header
file based on the platform and path to the Module file. We can even
throw an error if, say, a particular piece of software isn't available
for that platform.

Skylar
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