[slurm-users] Reset TMPDIR for All Jobs

[Marcus Wagner]

To be honest, they *somewhat* documented that, but it could be clearer, 
that user environment modification can only be done via task-prolog:

> The task prolog is executed with the same environment as the user tasks to be initiated. The standard output of that program is read and processed as follows:
> export name=value sets an environment variable for the user task
> unset name clears an environment variable from the user task
> print ... writes to the task's standard output.
> The above functionality is limited to the task prolog script.

You should also have in mind, that the task-prolog runs for EVERY task, 
something, we had to learn painfully.

Best
Marcus

Am 13.05.2020 um 17:18 schrieb Ellestad, Erik:
> Woo!
> 
> Thanks Marcus, that works.
> 
> Though, ahem, SLURM/SchedMD, if you're listening, would it hurt to cover this in the documentation regarding prolog/epilog, and maybe give an example?
> 
> https://slurm.schedmd.com/prolog_epilog.html
> 
> Just a thought,
> 
> Erik
> 
> --
> Erik Ellestad
> Wynton Cluster SysAdmin
> UCSF
> 
> 
> -----Original Message-----
> From: slurm-users <slurm-users-bounces at lists.schedmd.com> On Behalf Of Marcus Wagner
> Sent: Tuesday, May 12, 2020 10:08 PM
> To: slurm-users at lists.schedmd.com
> Subject: Re: [slurm-users] Reset TMPDIR for All Jobs
> 
> Hi Erik,
> 
> the output of task-prolog is sourced/evaluated (not really sure, how) in
> the job environment.
> 
> Thus you don't have to export a variable in task-prolog, but echo the
> export, e.g.
> 
> echo export TMPDIR=/scratch/$SLURM_JOB_ID
> 
> The variable will then be set in job environment.
> 
> 
> Best
> Marcus
> 
> Am 12.05.2020 um 17:40 schrieb Ellestad, Erik:
>> I was wanted to set TMPDIR from /tmp to a per job directory I create in
>> local /scratch/$SLURM_JOB_ID (for example)
>>
>> This bug suggests I should be able to do this in a task-prolog.
>>
>> https://bugs.schedmd.com/show_bug.cgi?id=2664
>>
>> However adding the following to task-prolog doesn’t seem to affect the
>> variables the job script is running with.
>>
>> unset TMPDIR
>>
>> export TMPDIR=/scratch/$SLURM_JOB_ID
>>
>> It does work if it is done in the job script, rather than the task-prolog.
>>
>> Am I missing something?
>>
>> Erik
>>
>> --
>>
>> Erik Ellestad
>>
>> Wynton Cluster SysAdmin
>>
>> UCSF
>>
> 

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