[Gate-users] Merging of many root files with gjm

Hannes Hofmann opengate at f00f.de
Tue Jan 15 09:48:31 CET 2008

Thanks for the answers.

>> Is divide-and-conquer merging possible? Which means to me: merge 8 times
>> 600 root files into 8 intermediate files and merge those intermediate
>> files again into the final root file. Has someone done that before? What
>> could go wrong with that? I am only interested in Singles anyway.
> You could, if you don't care about the correct eventID for each single.

I think I can do without them. All I need is the runId, energy and the

> You can also easily merge everything with a chain in a simple root
> script then.
> I wasn't aware of the limitation though. We don't have a 1000+ cpu
> cluster ;-)

Neither do I :( , but I am simulating a gated acquisition and was doing a
naive approach (see next mail)

> It could be solved by opening only a few files at a time in the merger.

Kind regards,

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