Re: [Condor-users] Using a machine ad value in a deferral_time line?

[Jaime Frey <jfrey@xxxxxxxxxxx>]

On Feb 20, 2008, at 5:41 PM, Ian Chesal wrote:

> I have, on every machine in my pool, an integer attribute pair that
> defines a "preemption window":
>
> 	ALTERA_EARLY_PREEMPTION_TIME = 300
>
> I'd like some of my jobs to wait for this preemption window to close
> before they start actually doing any work. The deferral_time setting  
> in
> a submit ticket looks like a nice, generic way to pause the start of a
> job until the premption window closes. I could just add:
>
> 	deferral_time = (CurrentTime + 300)
>
> But I like to use the attributes whenever possible. Assuming I'm
> advertising ALTERA_EARLY_PREEMPTION_TIME in the machine's classad by
> adding it to STARTD_EXPRS, can I use TARGET in this setting to  
> reference
> the machine's ALTERA_EARLY_PREEMPTION_TIME value? So:
>
> 	deferral_time = (CurrentTime +
> TARGET.ALTERA_EARLY_PREEMPTION_TIME + 1)


Sadly, the machine ad isn't considered when the job deferral  
attributes are evaluated. It appears we didn't consider a user wanting  
to do this.

Here's a hack to do what you want, though:
deferral_time = (CurrentTime + int("$$(ALTERA_EARLY_PREEMPTION_TIME)")  
+ 1)

The $$(...) gets substituted with the appropriate machine ad attribute  
value at match time, but it can only be used inside strings. So we use  
the int() function to convert the string into an integer for use in  
the expression.

Thanks and regards,
Jaime Frey
UW-Madison Condor Team