Hello Peter and sorry for the late reply. My name is Ido and I'm the perftest maintainer.
As you suspect, the multicast feature in perftest is only intended for end 2 end machines, and he does not support multiple receivers vs. sender. But the changes should be minor in order to complete this task. Please remove all ctx_hand_shake calls from the code, and supply as parameters the MGID manually (using -M) for both sides. Instruct the sender to send to this MGID, and the server should automatically receive the packets. Actually you can take only the multicast_resources.* code and use it to register MGID and then you will be able to construct a much simple test for your need. I can try code by myself for you (and maybe commit this to the package) but I cannot promise a time frame for completing this, and as I say you should be able to do it yourself. Make sure you are working with the latest perftest code (git://git.openfabrics.org/~shamoya/perftest.git). I would be glad to help on any issue, please add the word perftest to the subject. Regards, Idos. On 8/17/2011 1:10 PM, Kovacs Peter Tamas wrote:
Hi all, I'm trying to benchmark multicast performance on a simple Infiniband network with three nodes using ib_send_bw, but apparently we cannot find the right parameters for doing so. Point-to-point measurements work fine, but when setting up a multicast test with one sender and multiple receivers, we cannot make them start. The best I guess it must be something like "ib_send_bw -c UD -g <some number> " on the sender side, and "ib_send_bw -c UD" on the receivers side, but I don't know how the senders and receivers can all connect to exchange data, like they do in a point-to-point test by providing the IP address of the listening end. Skimming through the source, ctx_hand_shake looks to me like it's for two parties, not more than two, but I must be wrong. The readme also talks about a single server and a single client. As far as I can see, I cannot list multiple IPs when using the multicast feature either. The best I could make is an "Failed to exchange date between server and clients" error message, making one of the listening servers exit. I've got predefined multicast groups from 0xc000 to 0xc0009, and queried the corresponding GIDs with saquery, but feeding any of these via the -M option did not help either. Could any of you please shed some light about using this feature, ie. measuring multicast performance between 1+N nodes, one sender and N receivers. With many thanks, Peter Kovacs _______________________________________________ ewg mailing list ewg@lists.openfabrics.org http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg
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