Ed, How big are your files? 1 Mbyte, 100 MBytes, 1 GByte ? How long does it take to process one single file? TChain should not add any overhead. Which version are you using? Rene Brun Edward Moyse wrote: > > Hi guys, > > A quick question: I have 3000 files on castor. At the moment I have a loop > which chains all the files together, and then the resulting TChain is used > for the eventloop. This is extremely, extremely slow - so far it's been 30 > mins and only 300 of the 3000 files are chained. > > I'm not sure how ROOT works - does it load the files in memory to chain them? > > Does the number of files make a difference? Would it be quicker to merge the > 3000 into (say) 30 large files and chain those, or is ROOT just limited by > network performance (i.e. there's nothing I can do)? > > Cheers! > > Ed Moyse
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