Re: [HTCondor-users] How to use condor_chirp?

[Brian Bockelman <bbockelm@xxxxxxxxxxx>]

Hi Thomas,

Two things to note:
1) "condor_chirp set_job_attrâ requires +WantIOProxy=true in the classad.  This updates the ClassAd immediately in the schedd - which can be a scalability concern.
2) âcondor_chirp set_job_attr_delayedâ works by default.  However, it only sends the attribute in the next scheduled ClassAd update (for CPU and memory usage); thereâs less scalability concern.  Additionally, attributes set with this command must start with the prefix âChirpâ (case-sensitive).

Can you give some background on what youâre trying to accomplish?

Brian

> On Mar 14, 2016, at 12:44 PM, Thomas Hartmann <thomas.hartmann@xxxxxxx> wrote:
> 
> Hi all,
> 
> I would like to inject some system information into jobs' ClassAds.
> As I understand condor_chirp, I cannot inject/manipulate ClassAds on a
> worker for a running job, but only during submission. (I assume, that
> ~/.job.ad is where a job keeps its ClassAds [1] -- but can I inject it
> from outside the job 'properly'?)
> 
> We get our grid jobs currently via an ARC-CE so I suppose the best place
> would be there (where?) to enable the communication token by appending
> +WantIOProxy = TRUE
> to job submissions scripts, or?
> 
> I am not sure, where to actually call condor_chirp on the worker?
> My best guess is so far, to find the template for the job wrappers, i.e.,
> /var/lib/condor/execute/dir_*/condor_exec.exe
> and chirp from it, or? Probably starting a separate thread for updating
> changing ClassAds.
> Would that be reasonable or is there a better way?
> Where would I find the wrapper for condor_exec.exe?
> 
> Cheers and thanks,
>  Thomas
> 
> 
> 
> [1]
>> cat /proc/`ps axf | grep "/bin/bash -l /var/lib/condor/execute/dir" |
> tail -n1 | cut -d " " -f 2`/environ  | tr '\0' '\n' | grep "_CONDOR_JOB_AD"
> _CONDOR_JOB_AD=/var/lib/condor/execute/dir_38259/.job.ad
> 
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