[infinispan-dev] introducing an artificial network delay

[Sanne Grinovero]

2010/7/6 Bela Ban <bban at redhat.com>:
>
>
> 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.

Awesome, I had already eclipse open to try making this but somehow
felt that it was likely to exist already..
thanks

Sanne

>
>
> --
> Bela Ban
> Lead JGroups / Clustering Team
> JBoss
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