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Hi Derek, Yes, a bulk look-up is in the protocol (see Prepare() in XrdClientAdmin.hh). Geri, Fabrizio, and I are also planning on providing a combined prepare/open interface. So, for instance, you can say open(const char path[], XrdClient *files[]) which would open all you files in parallel. We are also planning on providing a method pair that would allow you to queue many opens and then come back and get one file at a time (whichever file was ready at the time). Andy ----- Original Message ----- From: "Derek Feichtinger" <[log in to unmask]> To: "Andrew Hanushevsky" <[log in to unmask]> Cc: "xrootd mailing list" <[log in to unmask]> Sent: Tuesday, April 26, 2005 1:50 AM Subject: bulk lookup on olbd possible? > Hi, Andy > > In the context of proof I had already thought of whether one could use the > olbd to just ask about file locations without really accessing the files. > The > information would then be used to direct jobs to nodes which already have > the > required file. (I.e. in this picture, every worker node runs an > xrootd/olbd). > > Is it possible to do a bulk lookup of many files on the olbd? If this can > be > done in bulk mode, then I guess you would still need only the basic > waiting > time (~5 s default delay) until you know where the files are. > > This kind of information could be interesting for all kinds of job > scheduling/queuing systems. > > (PS: Andreas is on a meeting and I still have no feedback on the issue > concerning the "opaque information" problem and our athorization > extension). > > Cheers, > Derek > > -- > Dr. Derek Feichtinger Tel: +41 22 767 10 07 > LCG/ARDA Group email: [log in to unmask] > CERN > http://people.web.psi.ch/feichtinger > CH-1211 Genève 23 > > >