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PROOF on the Grid

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PROOF on the Grid

Marco MEONI

CERN - Offline Week – 28.10.2009

distributed PROOF is an ongoing development

A combination of PROOF and AliEn…… to achieve interactive parallel analysis on distributed clusters exploiting data locality

Grid Site C

Grid Site A

Grid Site B

- A ProxyServer starts Xrootd and PROOF master
- JAs are sent to the VOs and start ProxyClients
- A ProxyClient starts an Xrootd server and registers to the ProxyServer
- A ProxyServer keeps the list of all the partecipating nodes
- A user starts a dPROOF session connecting the topMaster

1

User workspace

2

AliEn-LCG Grid

3

Grid API

ROOT

AliEn-LCG WMS

4

5

5

PROOFtopMaster

1

VO-box 1

VO-box n

VO-box m

ProxyServer

Xrootdmanager

PROOFlocalMaster

4

2

3

ProxyClient

JA

WN1

WN2

WNn

Xrootd

server

PROOFworker

WN workspace

Site workspace

Participating Sites

http://pcalimonitor/dproof/

- CNAF (by the end of the week)
- Kosice
- NIHAM

4 steps to enable dPROOF on a VObox

http://cern.ch/mmeoni/dproof/

ALICE is adapting PROOF to the Grid

The framework is under test at 3 sites

3 sites will most likely join within the next week

The multi-master PROOF architecture is under test and improvement

There is room for changing/improving the policy of JA submission

Workgroup meets twice a week since a month

Stress test per-site works steadily for hours and keep the PROOF workers busy

Test with up to 100 workers on a single site (CERN), processing rate peak 400MB/s

Acknowledgement

Adam, Anar, Andreas, Andrei, Axel, Bellenot, Costin, Cvetan, Jan Fiete, Latchezar, Federico, Mariella, Matevz, Pablo, Peter