Hi Ralph, Am 25.11.2011 um 03:47 schrieb Ralph Castain:
> > On Nov 24, 2011, at 2:00 AM, Reuti wrote: > >> Hi, >> >> Am 24.11.2011 um 05:26 schrieb Jaison Paul: >> >>> I am trying to access OpenMPI processes over Internet using ssh and not >>> quite successful, yet. I believe that I should be able to do it. >>> >>> I have to run one process on my PC and the rest on a remote cluster over >>> internet. I have set the public keys (at .ssh/authorized_keys) to access >>> remote nodes without a password. >>> >>> I use hostfile to run mpi. It will read something like: >>> ----------------------------- >>> localhost >>> u...@remotehost.com >> >> this is not a valid syntax for Open MPI. > > This isn't correct I'm completely sorry about this, it wasn't my intention to misguide anyone. But this syntax isn't something I would have expected to work, nor is it documented in `man mpiexec` AFAICS. I suggest to add it there or at http://www.open-mpi.org/faq/?category=running. Or maybe a complete new man page for "hostfile", where also slots= and max_slots= are explained in one location. NB: Checking orte/util/hostfile/hostfile.c even ^ to exclude hosts is supported, but from which initial list will they be excluded? In the `man orte_hosts` I find --default-hostfile which could be the initial list, but --default-hostfile isn't in mpirun's man page. -- Reuti > - we have long supported that syntax in a hostfile, and there is no issue > with having a different user name at each node. > > Jaison: are you sure your nodes are setup for password-less ssh? In other > words, have you setup your .ssh files on the remote nodes so they will allow > us to ssh a process on them without providing a password? This is the typical > problem we see. > > >> >> >>> ----------------------------- >>> But it fails. >>> >>> The issue seems to be the user! That is, the user on my PC is different to >>> that of user at remotehosts. That's my assumption. >>> >>> Is this the problem? Is there any work-around to solve this issue? Do I >>> need to have same username at all nodes to solve this issue? >> >> You can define nicknames for an ssh connection in a file ~/.ssh/config like: >> >> Host foobar >> User baz >> Hostname the.remote.server.demo >> Port 1234 >> >> While this will work with any nickname for an ssh connection, in your case >> the nickname must match the one specified in the hostfile, as Open MPI won't >> use this lookup file: >> >> Host remotehost.com >> User user >> >> ssh should then use the entries therein to initiate the connection. For >> details you can have a look at `man ssh_config`. >> >> -- Reuti >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
