Re: [ROOT] chaining/efficiency query

From: Edward Moyse (edward.moyse@cern.ch)
Date: Fri Sep 12 2003 - 16:53:30 MEST


> Also, you are using castor. Maybe some of your files are not staged when
> you stage them, so castor first has to retreive them from tape.

No, they are definitely staged.

Network performance may well be an issue - what I was really asking is, in 
practice, is it better to have a few very large files, or lots of smaller 
files. It's easier for me to have many small files, but at the moment the 
code is unbearably slow. 

Rene's suggestion to use AddFile has dramatically sped up the chaining stage 
(it's all completed in <2s as opposed to 2 hours!!!!) but the filenames are 
wrong, and nothing is processed.

Cheers,

Ed



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