You might check for problems with your network drivers (or just for updates), especially if the head node has a different card than the others. I think the problem with the shipped 3c2000t driver I used to use was related to UDP transfers.
The pfilter thing is easy to check, just remove the package with the oscar wizard and check your program again. Then if it still doesn't work you can put it back again if you want. Also, you might just try running "Complete Cluster Setup" again (which resets a bunch of configuration files), or rebooting the cluster (headnode first, then nodes). Every once and a while I have gotten things into odd states and those two things are quick and easy things to try. As far as running other UDP programs, I believe LAM/MPI uses UDP for some of its inter-daemon communications so you might try running some benchmarks or somesuch using LAM and see if they work. I am not super sure about this though. On 5/2/05, ullas ckm <[EMAIL PROTECTED]> wrote: > hi, > > thx for the reply. > > But if we run client program on the head node and send the packet(to server) > then smooth communication is possible. > that time its not dropping any packets.only in the first instance(i,e server > waiting for some request) its giving problem. > > cheers > ullas > ----- Original Message ----- > From: "Bernard Li" <[EMAIL PROTECTED]> > To: "ullas ckm" <[EMAIL PROTECTED]>, [email protected] > Subject: RE: [Oscar-users] client-server programming not possible with head > node?why > Date: Sun, 1 May 2005 23:57:01 -0700 > > > > > Hi Ullas: > > > > Do you have pfilter installed? If so then it is probably dropping > > the packets. For more information about pfilter, check: > > > > man pfilter > > > > Cheers, > > > > Bernard > > > > ________________________________ > > > > From: [EMAIL PROTECTED] on behalf of ullas ckm > > Sent: Sun 01/05/2005 11:52 PM > > To: [email protected] > > Subject: [Oscar-users] client-server programming not possible with > > head node?why > > > > > > > > Hi, > > > > we have the cluster setup(OSCAR4.0 on RH9.0).now we are trying out > > some high performance application(large file transfer). > > > > For that we were trying out some UDP communication between head > > node and some external system. > > server program: on head node > > client:external system > > > > But our server program(running on head node) wont recieve > > packets(first packet) directed to it. > > > > somebody please try some client-server program,running server > > program on head node and pls let us know whether the problem > > persists. > > > > Thanks, > > Ullas > > -- > > _______________________________________________ > > Check out the latest SMS services @ http://www.linuxmail.org > > This allows you to send and receive SMS through your mailbox. > > > > Powered by Outblaze > > > > > > ------------------------------------------------------- > > This SF.Net email is sponsored by: NEC IT Guy Games. > > Get your fingers limbered up and give it your best shot. 4 great events, 4 > > opportunities to win big! Highest score wins.NEC IT Guy Games. Play to > > win an NEC 61 plasma display. Visit http://www.necitguy.com/?r > > _______________________________________________ > > Oscar-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/oscar-users > > -- > _______________________________________________ > Check out the latest SMS services @ http://www.linuxmail.org > This allows you to send and receive SMS through your mailbox. > > Powered by Outblaze > > ------------------------------------------------------- > This SF.Net email is sponsored by: NEC IT Guy Games. > Get your fingers limbered up and give it your best shot. 4 great events, 4 > opportunities to win big! Highest score wins.NEC IT Guy Games. Play to > win an NEC 61 plasma display. Visit http://www.necitguy.com/?r > _______________________________________________ > Oscar-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/oscar-users > ------------------------------------------------------- This SF.Net email is sponsored by: NEC IT Guy Games. Get your fingers limbered up and give it your best shot. 4 great events, 4 opportunities to win big! Highest score wins.NEC IT Guy Games. Play to win an NEC 61 plasma display. Visit http://www.necitguy.com/?r _______________________________________________ Oscar-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/oscar-users
