Hello Kyle On Mon, 23 Apr 2012 17:45:59 -0500 Kyle Schochenmaier wrote: > Hi Andrew - > > Yes, thats the one. you'll want to build the tcp version (make tcp, > iirc), and then run it between your client and your server nodes to > check bandwidth. > It will bring in NPTcp or NPtcp, pretty simple to run.
It took me some time to write an ebuild to install this package properly on all my systems :). I ran NPtcp on a single host2host connection. Results are fine: a speed function grows and is monotonic, there are no singularities. After 1MB size of a message the speed is always above 910 Mbps and is steadily approaching an asymptotic limit afterwards. Results has no apparent dependency on a TCP buffer size at all. But I have no problem with a single node2node communication in the first place. So now I'm testing NPtcp runs in parallel for each node in group with group size from 1 to 15 nodes. For each test TCP buffers from 64K to 4M are tested as well as the system default value. NPtcp message size is allowed to grow up to 16M. This procedures will take some time, I'll post results later. Best regards, Andrew Savchenko
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