Re: [Condor-users] does dagman support the trigger condition ?

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

On Wed, 9 Jul 2008, zhang SunMoonStar wrote:

>                does dagman support the trigger condition  ?  what extent
> does the dagman support the loop dag to, a little or just not at all?
By a trigger condition, I assume you mean running a certain job when some 
external event happens.  If this is what you mean, the answer is that 
DAGMan does not support it.  There is a cron capability in Condor itself
that could be used to run jobs at a certain time (this is not part of 
DAGMan).  Another possibility would be to create a DAG node job that 
monitors the thing you want to trigger on, and exits when the trigger 
condition is true -- then the next job in the DAG would be the thing you 
want to do when the trigger happens.
Right now, DAGMan does not support loops at all.  One technique we have 
used to simulated loops (if the number of iterations is not too large) is 
to "unroll" the loop into a number of sequential jobs.  If you don't know 
the exact number of iterations ahead of time, you can use the 
ABORT-DAG-ON keyword to break out of the loop when you are done. 
(Obviously, this technique will only work if you can put some kind of 
upper bound ahead of time on the number of loop iterations you'll need.)
Hopefully this answers your questions...

Kent Wenger
Condor Team