Hi HP, a simple serial way to do it is: { // open file while (!EOF) { // read N bytes (> 256 KB is efficient) for (node = 0; node < MAXNODES; node++) { socket[node]->Send(buffer); // if error flag node as down and continue with other nodes } } // close file } More efficient is to send the same buffer in parallel to the 50 nodes using non-blocking sockets and a select to check when a socket it ready to send a next message. This can be easily done with a TMonitor. For an example of this technique see: http://root.cern.ch/lxr/source/net/src/TPSocket.cxx#283 Cheers, Fons. HP Wei wrote: > > Hi rooters, > I want to get some ideas on how to do the following > in ROOT. > > Suppose there is one machine called M on which there is > a file (ascii or binary) named filename. > > Suppose there are another 50 machines named > C1, C2, ... C50. > > All these machines are on a network, and are all running > UNIX like OS. > > Now, I want to send (copy) the filename from M > onto those 50 machines by multicasting way. > > ----------- > A skeleton code will be appreciated! > > Thanks, > HP > > > -- 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 7677910
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