[infinispan-dev] introducing an artificial network delay

[Manik Surtani]

I have used this technique in some other tests as well.  Have a look at RehashAfterPartitionMergeTest, for example, on line 39:

	http://viewvc.jboss.org/cgi-bin/viewvc.cgi/infinispan/trunk/core/src/test/java/org/infinispan/distribution/rehash/RehashAfterPartitionMergeTest.java?view=markup

Perhaps it makes sense to wrap this stuff up in a helper method on TestingUtil so it can be reused easily, perhaps something like:

	public DISCARD addDISCARD(Cache c) { ... }

and 

	public DELAY addDELAY(Cache c) { ... } ?

We'd probably want the reverse as well:

	public void removeDISCARD(Cache c) { ... }
	public void removeDELAY(Cache c) { ... }





On 6 Jul 2010, at 13:54, Bela Ban wrote:

> 
> 
> Sanne Grinovero wrote:
>> Hello,
>> I'm running some performance tests; my goal is to alter the code for
>> the Lucene Directory to use optimal batching and Flags, but to make
>> sure I'm improving performance for DIST and REPL configurations the
>> only option I'm having is to run it on a real cluster, which is not
>> doable right now.
>> 
>> So as I'm running tests on my laptop, network IO is not real and I
>> suppose it's not representative of real life bottlenecks.
>> 
>> Is there some option I could set in the jgroups configuration to
>> introduce an arbitrary delay,
> 
> Yes, DELAY ! :-)
> 
> Options in_delay and out_delay add some ms to every incoming or outgoing 
> message. Take a look at the code, DELAY is only ~ 80 lines, so you could 
> also write your own, which introduces varying delays.
> 
>> or even some degree of random packet losses?
> 
> Yes, DISCARD ! Use 'up' and 'down' to introduce random discards, e.g. 
> DISCARD up=".4" means that 40% of incoming messages are discarded.
> 
> 
> -- 
> Bela Ban
> Lead JGroups / Clustering Team
> JBoss
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--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org