(r2) BatchSystem < Computing/Documentation

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---+ The PPD Batch System

The PPD Batch System is shared between the Grid Tier 2 and Local usage (often referred to as Tier 3). It uses the torque batch system (an evolution of PBS) and the Maui scheduler to allocate the job slots fairly.

[[BatchUsage][Submitting and monitoring jobs]]

---+++ Resources

The PPD Batch Cluster currently has a nominal capacity of 1584 job slots (one for each of the 1584 CPUs) on 240 nodes. The power of the CPUs are measured using a benchmark called HEPSPEC06, the individual CPUs range from a HEPSPEC06 rating of 6.80 for the oldest CPUs to 8.50 for the newest. The nominal total HEPSPEC06 rating of the cluster is 12,918.4

While almost all of the CPUs (1544) run 64bit Scientific Linux 5, there is a small 32bit SL4 service of 40 CPUs for groups that still need it - though that will be phased out as the need goes away.

---+++ Allocations

The system uses the Maui scheduler to "fairly" share out jobs starts between different users, it uses a number of different factors totry to do this. Amongst them are whether it is a "local" or grid job, the Grid VO, groups within the VOs and individualuser accounts. These are compared to theusage over the last seven day.

The current highest level Shares are:

|  Local  |  10%  |
|  Grid  |  90% |

Then below that:

|  Atlas  |  22.14%  |
|  BaBar  |  14.64%  |
|  CMS  |  36.20%  |
|  LHCb  |  25.98%  |
|  Other  |  1.04% |

---+++ Queues

-- Main.ChrisBrew - 2009-11-17
Topic revision: r2 - 2010-01-18 - TimAdye