why run module unload failed in modulefile? - module

Question

I am a newbie.
I found an interesting thing about Environment modules.
please see the following process.
my linux OS is redhat5.8.
I have installed environment modules 3.2.10, tcl8.6.6,
source init/csh successfully.
I write a qq/{61_0, 61_1, 61_2} modulefile respectively.
take qq/61_0 as an example.
cat 61_0:
\#%Module1.0
set curNameVersion [module-info name]
set curName [lindex [split $curNameVersion "/"] 0]
set var_name "61_PAT"
set install_path /soft/qq/61_0
if { [module-info mode load] } {
puts stderr "loaded $curNameVersion"
if { [info exists env($var_name)] } {
if { $env($var_name) != $install_path } {
puts stderr "rm loaded $curName"
module unload $curName
}
}
}
setenv $var_name $install_path
puts stderr "done 61_0"
.
.
61_1 modulefile is basically similar to 61_0 except set install_path /soft/qq/61_1 and puts stderr "done 61_1"
61_2 modulefile is basically similar to 61_0 except set install_path /soft/qq/61_2 and puts stderr "done 61_2"
3.
^Linux^: module add qq/61_0
loaded qq/61_0
done 61_0
^Linux^: module add qq/61_1
loaded qq/61_1
rm loaded qq
loaded qq/61_0
done 61_0
done 61_1
^Linux^: module add qq/61_2
done 61_0
done 61_0
done 61_0
..
...
done 61_0
done 61_0
done 61_2
4.
^Linux^: module list
Currently Loaded Modulefiles:
1) qq/61_0 2) qq/61_1 3) qq/61_2
^Linux^: echo $_LMFILES_
/software/qq/61_0:/software/qq/61_1:/software/qq/61_2
^Linux^: echo $LOADEDMODULES
qq/61_0:qq/61_1:qq/61_2
my question is:
it should not load multi-version for the same tool qq,
when load another version, it should module rm other firstly.
although I have module unload in modulefile, but it looks like module unload $curName sentence not work
when run 'module add qq/61_1', it means that, it will rm loaded qq/61_0 firstly,
and then execute qq/61_0 modulefile,
because it is unload for qq/61_0, it should not output line 'loaded qq/61_0'.
but it output 'loaded qq/61_0'.
why?
why is there so many many output 'done 61_0' when run 'module add qq/61_2'?
echo $LMFILES and echo $LOADEDMODULES have proven that it exists multi-version for the same tool,
how to keep only load one version?
anybody can help me?
Thanks in advance

Answer 1

The issue you describe is coming from a bug affecting Modules version <= 3.2.10. Newer Modules version (> 3.2.10) or up-to-date "environment-modules" package on RedHat-like Linux distribution have fixed this issue:
With a fixed Modules version, the process you describe seems correct (tested on Modules 3.2.10 and greater on a Fedora system):
$ module add qq/61_0
loaded qq/61_0
done 61_0
$ module add qq/61_1
loaded qq/61_1
rm loaded qq
done 61_0
done 61_1
$ module list
Currently Loaded Modulefiles:
1) qq/61_1
$ module add qq/61_2
loaded qq/61_2
rm loaded qq
done 61_1
done 61_2
$ module list
Currently Loaded Modulefiles:
1) qq/61_2