[ROOT] Re:Re: TTree::Autosave

From: KOSU_FOKIN@garbo.lucas.lu.se
Date: Wed Oct 11 2000 - 15:04:14 MEST


Hi Rene,

perhaps I wrote a bit missleading message. No, I do not call autosave
after each event but rather after a predefined number of events set by
a user. What I wanted to say tis that at high event rates I update
event file quite frequently and it causes collisions.

I do know that autosave as well as TFile::Write() is a very time
consuming procedure. On the other hand what I want to do is to
write and physically flush the latest hundred events at the end
of an existing file. Why it is so time consuming? Also ... I have
noticed that it slows down with file size growing. In  our cases
(with Susan) we do not want to overwrite the whole file or do something
except writing things at the end of file. How can we do so?

Best regards,
ANton



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