The CERN Analysis Facility - A PROOF Cluster for Prompt ... - Desy
The CERN Analysis Facility - A PROOF Cluster for Prompt ... - Desy
The CERN Analysis Facility - A PROOF Cluster for Prompt ... - Desy
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Output file merging<br />
Large output objects (e.g. trees) create memory<br />
problems<br />
Solution:<br />
save them in files on the workers<br />
merge the files on the master using TFileMerger<br />
L. Tran-Thanh<br />
New class TProofFile defines the file and provide tools to<br />
handle the merging<br />
Unique file names are created internally to avoid crashes<br />
Merging will happen on the Master at the end of the<br />
query<br />
Final file is left in sandbox on the master or saved where<br />
the client wishes<br />
Included in ROOT 5.17/04<br />
Slide from<br />
Gerri Ganis<br />
(<strong>CERN</strong>)<br />
50
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