Hi Thomas, sorry for the late reply. Concerning the loading of private shared libraries you have to use the PROOF package manager, to build a little PAR file (PROOF ARchive file) that contains either the source or binaries of your private library and a script to compile it (if source) and a script how to load it into the PROOF servers. An simple example PAR build script and how to use it can be found in $ROOTSYS/test/ProofBench/make_event_par.sh. PROOF jobs are in general I/O intensive, but a lot depends on how the data is distributed over the cluster. Ideally if you have N nodes you would distribute the data also over N nodes. In which case the PROOF master will make sure that the workers will access, as much as possible, the data locally. Also to make sure that the data that has to be accessed over the network does not slow down the the processing too much use preferably GB eth connections. Putting all data on a single node will effectively serialize PROOF's operations (if the bandwidth of that device is not very high). We are working on a more concise PROOF manual in the coming months. Cheers, Fons. On Thu, 2004-08-26 at 11:27, Thomas Eberl wrote: > Hi, > > I have setup a small PROOF cluster for testing. > 4 PCs running Fedora Core 1, ROOT 400-08 > It seems to work, when I login and process a TNtuple which is accessed > from the nodes via rootd. I simply use TDSet.Draw(); > > When I load my private shared libs containing my own data structure > definitions and try to process a TTree, it fails, as the slave nodes > don't know the classes. How can I tell them to load the shared libs as > well ? > > Is there some documentation on PROOF in the meanwhile (couldn't find it) > ? I'd be looking for an example that shows how to run a more complicated > script via PROOF. If the process is IO dominated, PROOF doesn't give a > speed benefit, it seems. > > Thanks > > Thomas -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://www.rademakers.org/fons/ Fax: +41 22 7679480
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