Jeff Squyres <jsquyres <at> cisco.com> writes: > > On Nov 30, 2011, at 6:03 AM, Jaison Paul wrote: > > > Yes, we have set up .ssh file on remote EC2 hosts. Is there anything else that we should be taking care of when > dealing with EC2? > > I have heard that Open MPI's TCP latency on EC2 is horrid. I actually talked with some Amazon / EC2 folks about > it at SC'11 a few weeks ago; we set a date to dive into it a bit deeper in December. > > No promises on when/if the TCP latency will improve, but it's definitely something that we're looking at. > My first *guess* is that it might have something to do with specifying btl_tcp_if_include / > oob_tcp_if_include improperly (or not at all) -- but that's a SWAG. >
Yes Jeff, We are not setting up --mca btl_tcp_if_include / --mca oob_tcp_if_include at all at the moment. What will be the best setup to access EC2 hosts over internet for --mca btl_tcp_if_include / --mca oob_tcp_if_include? I dont understand --mca very well. Thanks, Jaison
