Re: [HTCondor-users] about START and RANK

["Beyer, Christoph" <christoph.beyer@xxxxxxx>]

Hi Jiang,

That's a sequential thing, the startd chooses a job that he prefers the most according to your rank expression.

Than before starting the job the startd evaluates the start expression to have a look if everything is ok to start the job.

For ex you could use the rank expression to prefer a multicore job and the start expression to only run it if the free disk space at start time is >200gb ...

best regards
        ~christoph


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----- UrsprÃngliche Mail -----
Von: jiangxw@xxxxxxxxxxxxxxx
An: johnkn <johnkn@xxxxxxxxxxx>
CC: htcondor-users <htcondor-users@xxxxxxxxxxx>
Gesendet: Thu, 03 Nov 2016 04:27:03 +0100 (CET)
Betreff: Re: [HTCondor-users] about START and RANK

Dear John,
    Thanks.  As your reply I see the meaning of START and RANK.
    We used START and RANK in the same startds.   
    Dose negotiator  use START and RANK in some ordor when choose these startds.
    START first or RANK first?
    We got a problem as follow:
        START = TARGET.AcctGroup == "A" || TARGET.AcctGroup =="B" ||  TARGET.AcctGroup =="C"
        RANK = TARGET.AcctGroup =="C"
    As above,  we  want the startd prefer the job with AcctGroup "C".
    But we found more jobs with B scheduled to these startd.
    There's no quota limits, dose START cause it?  

Cheers,
Jiang Xiaowei


NAMEïJiang Xiaowei
MAILïjiangxw@xxxxxxxxxxxxxxx
TELï010 8823 6024
DEPARTMENTïComputing Center of IHEP
 
From: John M Knoeller
Date: 2016-11-03 01:13
To: HTCondor-Users Mail List
Subject: Re: [HTCondor-users] about START and RANK
If A is true, then START is true B and C will never be evaluated.
 
START is a Boolean result that indicates whether a STARTD is willing to run a given job or not 
RANK is an number that Indicates which jobs a STARTD would prefer. (higher is better)
 
Depending on other configuration, a STARTD may choose to preempt a job that it is currently running in order to run a job that it gives a higher RANK to.  The actual decision to preempt or not happens in the negotiator, which uses the RANK value published by the STARTD in its decision
 
From: HTCondor-users [mailto:htcondor-users-bounces@xxxxxxxxxxx] On Behalf Of jiangxw@xxxxxxxxxxxxxxx
Sent: Wednesday, November 2, 2016 9:38 AM
To: htcondor-users <htcondor-users@xxxxxxxxxxx>
Subject: [HTCondor-users] about START and RANK
 
Dear all,
   
    I have a quetion about START.
    Example:
         START = A || B || C
    if A == True,  does condor calculate  B and C continuely, or condor judge the START is True without considering B and C.


    Besidesï what's the difference between START and RANK.
 
    Thanks for help.
 
Cheers,
Jiang xiaowei


NAMEïJiang Xiaowei
MAILïjiangxw@xxxxxxxxxxxxxxx
TELï010 8823 6024
DEPARTMENTïComputing Center of IHEP