Re: [HTCondor-users] Increasing maxpre for a running DAG

["R. Kent Wenger" <wenger@xxxxxxxxxxx>]

On Mon, 15 Sep 2014, Branden Timm wrote:

>  I'm wondering if it's possible to increase the maximum number of pre 
> scripts for a DAG after it has been submitted.  I was doing some 
> troubleshooting and lowered maxpre to 1, and now that there are many jobs 
> running in the queue that has become a bottleneck.  I'd like to let the 
> current jobs finish, but also increase maxpre so I can get more jobs in the 
> pipeline.
>
> Is there any way I can do this without halting the dag, waiting for the queue 
> to drain, and then resubmitting with a new maxpre value?

We have in mind implementing a "clean" way to do this, but for right now 
there's a kludgey way, if you set maxpre in a config file rather than on 
the condor_submit_dag command line.

Here's what you do:

1) condor_hold the condor_dagman job.
2) Edit your config file to have the new maxpre value.
3) condor_release your condor_dagman job.

(Note that command-line-specified values override config file-specified 
values, so if you did -maxpre <n> on the condor_submit_dag command line, 
this won't change anything.)

Kent Wenger
CHTC Team