Hi Bill, David, Chris, I have nothing to add to what I wrote in the URL below. Some changes are required to support large files (on systems supporting large files). It is mainly a question of getting access to a machine with a very good response time and about 8 Gbytes of free disk space. The changes in the code should be small. I have recently followed the experience in Babar in their attempt to write files bigger than 2 Gbytes. They have experienced a considerable number of problems with shell scripts, perl, etc. As a consequence they have decided to postpone this exercise and came back to "small" files. We should add a protection in the Root I/O system to stop writing in a file (case of TTrees) when approaching the fatal line in such a way that the Tree or/and file header can still be written correctly. Rene Brun David d'Enterria wrote: > > Hi William, > > William Love ha escrit: > > > I was running a program writing a root file output and it stopped with an > > output file 1999999975 Oct 5 13:28 R3452_1_lasertree.root > > Unfortunately I don't remember the error but I assume I have hit a file > > size limit? I can use the file by root's automatic recovery but when I > > tried to save the recovered directory I find Error in <TKey::Create>: Cannot > > allocate 2833 bytes for ID = R3452_1_lasertree.root Title = Error in > > <TKey::Create>: Cannot allocate 66 bytes for ID = R3452_1_lasertree.root > > Title = > > This makes it even more likely I have hit a maximum size limit in root? > > Is there any way to convince root to write larger files? > > This subject has already been addressed in this mailing list. Take a look at: > http://root.cern.ch/root/roottalk/roottalk99/1716.html > > Perhaps Rene Brun has got some new information concerning this (since 29 Jul > 1999) ? > > Best regards, > > David d'Enterria > ¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬ > Groupe Photons Subatech http://www-subatech.in2p3.fr/~photons/ > mailto:enterria@in2p3.fr phone: +33.2.51.85.85.60 > ¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬ > Grup Física Radiacions UAB http://cc.uab.es/~iffr1/ > mailto:d.enterria@cc.uab.es phone: +3493.581.13.64
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