Hi Giacomo, it might be some RFIO lookup issue. Try running with the shell variable RFIO_TRACE set, like: export RFIO_TRACE=10 This should print what RFIO is doing. Cheers, Fons. On Mon, 2002-08-05 at 16:47, Giacomo Bruno wrote: > Hi, > does anyone know why, when reading a root file which is under CASTOR, the > TRFIOFile constructor takes ages. This constructor is invoked when one > asks for the first time the data of a tree in the file. > The time seems not to depend on the CPU, > nor on the RAM of your machine. > I have also observed that if you have constructed a chain of trees > residing in different files, the constructor is invoked for each of them and while > for the first (about 10) files it is quite fast for the following becomes > extremely slow. Is there any means to speed up things ? > Thanks > Giacomo > > ----------------------------------------- > | Giacomo BRUNO | > | | > | CERN | > | EP Division | > | | > | mail: 40-2-B20 | > | C.E.R.N. | > | CH - 1211 Geneva 23 | > | Switzerland | > | e-mail: Giacomo.Bruno@cern.ch | > | phone: +41 22 76 71624 | > ----------------------------------------- > > -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7679480
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