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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