Re: [javagroups-users] Xmit Requests
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belaban
From: Bela B. <be...@ya...> - 2007-07-27 03:47:22
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FredrikJ wrote: > We setup and ran the performance tests included in the jgroups > distribution. > Running the included udp.xml we got about 10k msg/s at first but then it > drops down to settle at around 4k msg/s. Switching to tcp nio gave a > maximum > message throughput of about 13k msg/s. > > We changed the stack in our application to use tcp nio instead of udp > and we > did no longer encounter the xmit request issue. Performance was also > clearly > improved. > > Since running the exact same jgroups testbed as in your benchmarks is > giving > us so much lower results then you are getting, I am starting to > suspect our > network hardware here. We are using a cheap 100 Mb Dell switch for > instance > which might be one of the causes. Does anyone have any experiences with > switches that might support this theory? That's entirely possible, as some switches don't handle IP multicast packets well. Note that in my tests, I used a GB switch, so that at least explains the diff between your and my numbers. However, despite the switch, you should not run out of memory. > Note: The reason that it was usually the coordinator in a 3-node cluster > that started spamming was not related to it's role in the cluster, but > rather the fact that node 2 and 3 were consumer and producer respectively > thus making node 1 receive twice as many messages as 2 & 3 individually. Don't understand this: is everyone a sender ? -- Bela Ban Lead JGroups / JBoss Clustering team JBoss - a division of Red Hat |