====== Condor - Job Queue System ======
===== General information =====

Look at the [[http://www.cs.wisc.edu/condor/manual/v7.6/2_Users_Manual.html|Condor User's Manual]] for an introduction to how to work with Condor. You can also check out the [[http://www.cs.wisc.edu/condor/manual/v7.6/7_Frequently_Asked.html|FAQs]].

An online overview of the current workload and the workload history can be found at:

http://manila.physik.uni-freiburg.de/condor

This website requires Java. Since Chrome does not support Java, you need to use a different browser.
===== Requirements, Rank, ClassAds =====

The Condor system distributes jobs among the group's computers. It is possible to influence the queue system by means of two options. 

  * Requirements
  * Rank

The administrator sets these options in the system configuration, and the user can set them in his submit scripts. 

These options are explained [[http://research.cs.wisc.edu/condor/manual/v7.6/2_5Submitting_Job.html#SECTION00352000000000000000|here]] and [[http://research.cs.wisc.edu/condor/manual/v7.6/4_1Condor_s_ClassAd.html#SECTION00514100000000000000|here]]

In addition, ''ClassAds'' ("classified ads") play an important role. Machines use ''ClassAds'' to advertise what kind of resources they offer. A job uses ''ClassAds'' to specify what resources it requires to run. The Condor documentation includes a [[http://research.cs.wisc.edu/condor/manual/v7.6/4_1Condor_s_ClassAd.html#sec:classad-reference|detailed description]] of ''ClassAds''.

Die documentation contains an [[http://research.cs.wisc.edu/condor/manual/v7.6/2_5Submitting_Job.html#SECTION00351300000000000000|example]] of how to use Requirements and Rank. Some of the useful ClassAds include:

  * Machine
  * Memory
  * Mips
  * Kflops

NOTE: Condor is capable of keeping track of the load on a computer due to non-Condor jobs and due to interactive work on the computer.

===== Important Condor commands =====

  * [[condor_status]] 

Use this command to inspect ClassAds and check the status of the queues.

{{tag>condor dittmaier ita schilling}}