Re: [jgroups-dev] New flow control protocols

Excellent! Should these be ported to previous maintained branches? It would certainly make life easier for users who are using/experimenting with a few branches in development/production.

Cheers,
Vladimir

On 2010-09-10, at 5:40 PM, Bela Ban wrote:

> FYI,
> 
> I've added 2 new flow control protocols: MFC (Multicast Flow Control) 
> and UFC (Unicast Flow Control). They're an implementation of [1], which 
> is about splitting the FC functionality into 2 separate protocols.
> 
> The advantages are that this simplifies the code, the code becomes more 
> maintainable, that we can enable unicast or multicast flow control 
> individually, that I could remove some coarse grained locking, and that 
> I created helper classes, e.g. to manage sender or receiver credits, 
> which can be unit tested individually, apart from the use in the protocol.
> 
> The downside is that we now have MFC and UFC instead of just FC.
> 
> My goal for performance was that MFC and UFC should be about the same as 
> FC, but not slower.
> 
> This morning, I ran a quick perf test [2] on a 4 node cluster, with 4 
> nodes (all senders) sending 1 million messages (of varying size) each. 
> The numbers are MiBs/sec/node.
> 
> The numbers for 4 nodes are:
> 
> Size   FC    MFC/UFC
> 
> 1K    135      135
> 2K    145      145
> 4K    145      145
> 8K    130      131
> 
> 
> The numbers for 8 nodes are (2 processes per physical box):
> 
> Size   FC    MFC/UFC
> 
> 1K     72       73
> 2K     83       85
> 4K     87       93
> 8K    107      113
> 
> 
> As can be seen, performance is about the same, or even slightly better 
> with MFC/UFC when running 2 perf JVMs / physical box. However, the 
> second test on 8 nodes is to be taken with a grain of salt, as the 2 
> JBMs/box are competing for CPU and the network, and therefore we don't 
> saturate the network (bandwidth)...
> 
> To use the new folw control protocols, replace
> 
> <FC max_credits="2M" min_threshold="0.6" />
> 
> with
> 
> <UFC max_credits="2M" min_threshold="0.6" />
> <MFC max_credits="2M" min_threshold="0.6" />
> 
> I will change the configs shipped with JGroups after some more testing 
> and updating the documentation.
> 
> 
> [1] https://jira.jboss.org/browse/JGRP-1154
> 
> [2] http://community.jboss.org/docs/DOC-11594
> 
> -- 
> Bela Ban
> Lead JGroups / Clustering Team
> JBoss
> 
> 
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--
Vladimir Blagojevic
JBoss Clustering Team
JBoss, by Red Hat





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