See the modex database interface in orte/mca/grpcomm/base/grpcomm_base_modex.c. You'll have to create new code to send/recv an update message, but the code to update the database entry exists.Yes, about MPI communications.
Thanks again.What you mean with a send/recv update message i think that has to be something similar to pack/unpack info maybe using also the allgather like it's done in grpcomm_base_modex.cI took a look to the code and i found the orte_grpcomm_base_update_modex_entries(&proc_name, &rbuf) function, and then i printed the attr_name and i get btl.tcp.1.7 and others attributes, but i'm not finding any information about the uri, address or something that allows me to communicate with another peer.I'm thinking that i have to (in some way) update the endpoint in some place, but i don't know frome where i can do this, and if there is a function that allows me to do that kind of update.
Are you talking about an MPI communication? If so, then you need to update every proc's modex info for the proc that moved - this is something stored in each MPI proc's memory, so it isn't something that you can just get from the daemon on-demand. You'll have to provide the update to every single proc directly so that it has the info if/when it should decide to send an MPI message to the proc that moved.This is why we do a modex upon restart - sending the change to every MPI proc is hardly scalable minus a collective operation.See the modex database interface in orte/mca/grpcomm/base/grpcomm_base_modex.c. You'll have to create new code to send/recv an update message, but the code to update the database entry exists.On Jun 2, 2011, at 7:52 AM, Hugo Meyer wrote:_______________________________________________Hello again.My actual problem is that i don't know where is the struct that has the information that is used to send messages to the procs.Something like:Rank URI0 21222:tcp:192.168.1.1:12501 21223:tcp:192.168.1.2:1250..... .....Because what i need is to update it when i move a process from its original site, is there something like this??Thanks a lot.Hugo
2011/5/31 Hugo Meyer <firstname.lastname@example.org>
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