r40 - 02 Dec 2018 - 16:55:34 - FredericDERUEYou are here: TWiki >  Atlas Web  >  Informatique > GuideAnalyse

User guide for physics analysis

This page is dedicated to the use of the available resources at the Lyon Computing Centre to perform a physics analysis. Since most of the ATLAS everyday workflow can be performed as on lxplus, this page now contains mostly pointers to the relevant ATLAS pages and a few points specific to CC-IN2P3. One should have read before the New user's guide, and the Grid user's guide.


Physics Analysis tools

We detail here a few link to help to start to perform physics analyses. Most of these informations concern the tools available through Athena. They are not specific to the use of the Lyon Computing Centre and thus only links to the usual CERN we pages are provided.

CERN wiki pages

The CERN Physics Analysis Work Book (select the release 21 version of the workbook for xAOD analysis) aims to give information to ATLAS members on how to start physics analyses. In general, the tutorials from the Atlas Computing TWIKI are a good place to start with.


Non-grid analysis

Non grid analysis are done through the Grid Engine batch scheduler. In particular the use of command qsub is described the CC-IN2P3 user guide and look at the Grid Engine Tutorial from 2012 (this was Oracle Grid Engine, minor difference can show with the current version of GE in use at CCIN2P3). One will take care in particular to declare usage of some resources using the qsub options -l sps=1 -l dcache=1 -l xrootd=1 (chose the one(s) you use)


Distributed analysis

Submitting grid jobs from CC-IN2P3 should be essentially not different from submitting from CERN. Currently (summer 2018), one has to take care to compile and submit from an SL6 interactive machine (NB: at this time, the option to run asetup in a singularity container has problems) since most of the grid sites still run SL6.


CC-IN2P3 User portal

CC-IN2P3 provides a new online service: a web portal allowing CC-IN2P3 users to monitor their resources and access documentation.

You may access the portal at the following URL: https://portail.cc.in2p3.fr, using your usual login credentials to the computing farm.

You will find:

  • basic information about your account at CC-IN2P3
  • monitoring views of your jobs status (and those of ATLAS)
  • views of your storage spaces usage (and those of ATLAS)
  • possible incident notifications related to your account
  • links to user documentation and collaborative tools provided by CC-IN2P3.
  • the CC-IN2P3 OTRS ticket system

The information is displayed through widgets, and most widgets have icons giving access to textual aids and different graphs. If you have already connected to the user portal, it is suggested you refresh your browser cache for these pages.

There is also set up an interface for you to let CC-IN2P3 know what you think is useful, what you think is useless, and what you would like to have added to improve this service: your feedback will help us make this service evolve.


How to use HPC and GPU

See dedicated page GPUUserGuide.


Usage of LOCALGROUPDISK

See dedicated page UsingLGD.


Monitoring

As user the main monitoring pages one should use are the ones from the CC-IN2P3 user portal (see above).

For sake of completeness, here are some other useful monitoring pages

  • For storage at CC-IN2P3




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