perfSONAR User Q&A and Other Discussion

[Pol Llovet <>]

Hello! 

I recently attended the PS tutorial at XSEDE and we have been charging ahead with it here at MSU.  We now have 2 servers (soon to be 3) that are testing bandwidth from the edge, behind the firewall, and deep in the network.  We don't have any owamp nodes yet, but this leads me to my question:

The reason that we would need those owamp nodes is because we were told that the scheduler for owamp tests and bwctl tests don't communicate so you run the risk of the tests happening on top of one another and getting bad data. However, it seems like there are terminal versions of the tests that can be run safely (bwping, bwtraceroute).  Am I correct in that assumption?

I have tried running bwping with -T owamp, but I have been unable to have a successful test.  For example:

[root@status pol]# bwping -T owamp -c owamp.seat.net.internet2.edu

bwping: Unable to connect to owamp.seat.net.internet2.edu

This test does seem to get scheduled if I use ps.tacc.xsede.org as the target, but I get the following result: 

SENDER START

owping: FILE=owping.c, LINE=1603, Unable to open control connection to [129.114.0.189]:5774.

bwctl: local tool exited before expected with status=1

When I go to http://ps.tacc.xsede.org/toolkit/ it looks like owamp is on port 861, but that errors out entirely when I try to use the same command with ps.tacc.xsede.org:861. 

So, can we use bwping with owamp? Or is this just a placeholder for later functionality?

thanks in advance,

pol

Pol M. Llovet
Research Computing / Middleware

Montana State University
w: 406-994-3416
c: 406-646-6747