December 16, 2014 Technical note Open Access

Dal Pra, Stefano

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{
  "DOI": "10.15161/oar.it/143357", 
  "abstract": "<p>The default behaviour of a batch system is to dispatch jobs to nodes having the lower<br>\nvalue of some load index. Whilst this causes jobs to be equally distributed among all the<br>\nnodes in the farm, there are cases when different types of behaviour may be desirable, such as<br>\nhaving a completely full node before dispatching jobs to another one, or having similar jobs<br>\ndispatched to nodes already running jobs of the same kind. This work defines the packing<br>\nconcept, different packing policies and useful metrics to evaluate how good the policy is. A<br>\nsimple farm simulator has been written to evaluate the expected impact on a farm of different<br>\npacking policy. The simulator is run against a sequence of real jobs, whose parameters have<br>\nbeen taken from the accounting database of INFN-Tier1. The effectiveness of two packing<br>\npolicies of interest, namely relaxed and exclusive, are compared. The exclusive policy proves<br>\nto be better, at the cost of unused cores in the farm, whose number is estimated. The<br>\npossibility of implementing the exclusive policy on a specific batch system, LSF 7.06, is<br>\nexploited. Relevant configurations are shown and an overall description of the mechanism is<br>\npresented.</p>", 
  "author": [
    {
      "family": "Dal Pra, Stefano"
    }
  ], 
  "id": "143357", 
  "issued": {
    "date-parts": [
      [
        2014, 
        12, 
        16
      ]
    ]
  }, 
  "language": "eng", 
  "title": "JOB PACKING: OPTIMIZED CONFIGURATION FOR JOB SCHEDULING", 
  "type": "article"
}