On May 18, 2012, at 4:02 AM, devendra rai wrote: > Hello Community/Ralph=0A=0AI was told by the sysadmin that the firewall doe= > s not prevent communication between two machines (tik33x, tik34x) for insta= > nce. However, it will only block if OpenMPI is trying to open TCP/UDP ports= > lower than 1024, which require privileges.=0A=0AIs it possible to know whi= > ch port numbers does OpenMPI use?
Open MPI uses random TCP ports above 1024 (i.e., we let the system assign which port numbers we use). > Specifically, is it possible to specify p= > ort numbers that OpenMPI must not use (OpenMPI-1.4.x)?=0A=0AHere is the rep= > ly I got from my sysadmin:=0A=0A"There is a firewall, but it does not block= > internal=0Atraffic within the whole TIK network (I verified it for myself)= > .=0AThus, the connection problem must be somewhere else=0A(a service not ru= > nning or binding to the wrong interface=0Afor instance). Maybe the service = > wants to bind to a=0Atcp or udp port lower than 1024, which can only be=0Aa= > llocated by the system's superuser. First, check on=0Awhich ports and on wh= > ich network card interfaces=0Athe software listens and if it is configured = > correctly=0Aso that it will listen at all."=0A=0A=0AIs there a way out?=0A= You might try specifying exactly which interfaces Open MPI should use. For example: mpirun --mca btl_tcp_if_include eth0 --mca oob_tcp_if_include eth0 ... This would restrict Open MPI to only using the "eth0" interface (obviously, you should substitute in whatever is the relevant interface name for your machines -- hopefully, it's the same interface name across all of them). Also, we just released Open MPI 1.6. You might want to upgrade when you can; the 1.6 series replaces the 1.4 series. -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
