Re: [Lmod-users] When using depends_on, setenv via a function is not unset by unload
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Re: [Lmod-users] When using depends_on, setenv via a function is not unset by unload
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From: Maxime B. <max...@ca...> - 2020-08-26 22:44:49
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I would add to that, since I encountered this very issue recently, that
"pushenv" can be used in this situation.
Best,
Maxime
Le 20-08-26 à 18:36, Robert McLay a écrit :
> Lmod does what you tell it to do. The depends_on("cuda") unloads the
> cuda module if it thinks it should. That is, if there are no other
> modulefiles dependent on cuda. So if it unloads the cuda module and
> it unsets CUDA_HOME, then of course os.getenv("CUDA_HOME") is going to
> return a nil, which is not a string. Lmod requires that setenv(A,B)
> that both arguments are strings. A simple way to fix your modulefile
> is to do:
>
> local cuda_home = os.getenv("CUDA_HOME") or ""
> setenv("THINGY", cuda_home)
>
> Best,
> Robert.
>
>
>
> On Wed, Aug 26, 2020 at 1:38 PM Shelly Johnson <js...@um...
> <mailto:js...@um...>> wrote:
>
> Suppose I have a module, hello, that depends_on('cuda/11.0.2'). I was
> hoping to be able to use something like
>
> #-----------------------------
> local installDir = "/sw/arcts/centos7/hello/1.0"
> local app = "hello"
> depends_on('cuda/11.0.2')
> local cuda_home = os.getenv('CUDA_HOME')
> setenv('THINGY', cuda_home)
> #-----------------------------
>
> That seems to work, so long as the cuda/11.0.2 module is already
> loaded when I load hello/1.0. That is, when cuda/11.0.2 was not
> loaded by depends_on().
>
> If the cuda/11.0.2 module is not loaded when hello/1.0 gets loaded,
> then upon unloading hello, I get
>
> Lmod Warning: Syntax error in file: /home/bennet/Lmod/hello/1.0.lua
> with command: setenv, one or more arguments are not strings.
>
> So, it seems that it might be unloading the module on which hello
> depends before unsetting the variables that hello sets, leading to the
> os.getenv('CUDA_HOME') not getting properly evaluated. Would it not
> be better to unset while the depended upon module was still active?
>
> This seems like it could be a bug.
>
> Thanks!
> Shelly
>
> Shelly Johnson
> Research Applications Specialist
> XSEDE Campus Champion
> Advanced Research Computing - TS
> University of Michigan
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> Robert McLay, Ph.D.
> Manager of Software Tools, HPC
> mc...@ta... <mailto:mc...@ta...>
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