[Gate-users] Merging multiple root files

[Marcin Balcerzyk]

Dear Ida.

The probable thing is a local disk system limitation. All FAT-32 related
systems have 1.8GB file size limit. Root is clever enough to create a series
of files, which are separately sensible. If you want to merge them, then
probably merging application does not recognize the divided files, not to
mention that it cannot write a large file. Solution - on Windows use NTFS
system, others - do not know. Note, that you may have a nice 64bit operating
system and a lousy 32bit file system. My Red Hat Linux uses such small
capacity file system. Other solution is to use network mounted drives to a
computer that does not have such file size limitation.  

Marcin Balcerzyk


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Today's Topics:

   1. Merging multiple root files (Ida H?ggstr?m)


----------------------------------------------------------------------

Message: 1
Date: Mon, 2 Nov 2009 09:38:02 +0100
From: Ida H?ggstr?m <ida.haggstrom at radfys.umu.se>
Subject: [Gate-users] Merging multiple root files
To: gate-users <gate-users at lists.healthgrid.org>
Message-ID:
	<ff2bc2ff0911020038u595f1216kd7b8845b77c587f4 at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Hello!

I have some problems with merging root files with filemerger after using
jobsplitter. Sometimes it works, but for some files  I get the error "no
latest_event_ID histogram - exit!" and no merged file of course.

I think the problem is due to the fact that for some runs I get very large
root files, so they are divided into many smaller ones. E.g. for two
splitted files I get rootOut1_1, rootOut1, rootOut1_2 and rootOut2,
rootOut2_1, rootOut2_2, as supposed to only rootOut1 and rootOut2. When
using gjm it tries to merge rootOut1 and rootOut2, which I guess don't
contain all information since they are only part of the files.

Has anyone any experience with this, or knows how to merge these type of
files? thanks!
Ida

PS. I saw similar posts from April 2008 (
http://lists.healthgrid.org/archives/gate-users/2008-April/002647.html) and
Oct 2007 (
http://lists.healthgrid.org/archives/gate-users/2007-October/002110.html)
but I could not get to any scripts or really use anything for myself.
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