Re: [HTCondor-users] RANDOM_INTEGER problems on Windows

["Smith, Ian" <I.C.Smith@xxxxxxxxxxxxxxx>]

Hi Dan,

Thanks for the quick reply. Yes having the correct syntax certainly
helps ! I really should RTFM more carefully :-;

The strange thing is though that >this< expression never seems to evaluate
to TRUE (i.e. the jobs never get vacated).

PERIODIC_VACATE = ( ( $(REBOOT_TIME) - ClockMin ) == $RANDOM_INTEGER(0, 10) )
                                                     ^
If I run condor_config_val I see different integer values generated so the
big question is how often are the random values updated compared
with the ClockMin values ??? Obviously if it's just generated once on start 
up then there's no problem but if the update periods are similar then
I could see why this would not work ...

Imagine for example that it is 10 minutes to reboot time and the just
a few integers are generated in the following minute: e.g 4, 8, 2, 3.
Then PERIODIC_VACATE doesn't evaluate to TRUE. By the same token on each 
succeeding minute the integer needed for this to evaluate to TRUE
may also not be generated.

I'm sure there must be a way of expressing this so that PERIODIC_VACATE
evaluates to TRUE just once a day at a randomised time but I can't
see it at the moment.

any ideas ?

many thanks,

-ian.



> -----Original Message-----
> From: htcondor-users-bounces@xxxxxxxxxxx [mailto:htcondor-users-
> bounces@xxxxxxxxxxx] On Behalf Of Dan Bradley
> Sent: 29 November 2012 15:21
> To: htcondor-users@xxxxxxxxxxx
> Subject: Re: [HTCondor-users] RANDOM_INTEGER problems on Windows
> 
> Hi Ian,
> 
> There should be a $ in front of RANDOM_INTEGER.  Does that help?
> 
> --Dan
> 
> On 11/29/12 6:18 AM, Smith, Ian wrote:
> > Hello All,
> >
> > I'm trying to configure our execute hosts to vacate jobs
> automatically
> > just before they are rebooted each night. To spread out the
> > checkpoints I've tried to add some "jitter" with RANDOM_INTEGER thus:
> >
> > PERIODIC_VACATE = ( ( $(REBOOT_TIME) - ClockMin ) == RANDOM_INTEGER(
> 0, 10 ) )
> > PREEMPT         = $(UWCS_PREEMPT) || ( $(PERIODIC_VACATE) == TRUE )
> >
> > but this does not seem to work. I can't track down a definitive error
> > message but it looks like the condor_startd (or possibly
> > condor_starter) is repeatedly failing and the shadow disconnecting
> because of this.
> >
> > If I take out the randomness, e.g.
> >
> > PERIODIC_VACATE = ( ( $(REBOOT_TIME) - ClockMin ) == 0 )
> >
> > everything works fine.
> >
> > Has anyone else seen this ? Is RANDOM_INTEGER supported under Windows
> > or does it have some /dev/random dependence ?
> >
> > I'm using Condor 7.6.2 on Windows 7 Enterprise.
> >
> > regards,
> >
> > -ian.
> >
> > ---------------------------------------
> > Dr Ian C. Smith,
> > Advanced Research Computing,
> > University of Liverpool, UK.
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