[infinispan-dev] DeadlockDetection (DLD) - benchmarks and status

[Manik Surtani]

BTW I just thought of something (implementation detail): you have a  
new LockManager impl here, right?  DeadlockDetectingLockManagerImpl?   
The default LockManagerImpl exposes stuff via JMX (and JOPR) using  
annotations on the impl class.  Can we move these annotations onto the  
LockManager interface so that we don't need to repeat this for any  
arbitrary interface?  Should test that these annotations are still  
picked up even if they are on the interface.  Not sure if this is the  
case.

Cheers
Manik

On 21 Jul 2009, at 11:19, Mircea Markus wrote:

> Hi,
>
> I've extended the original DLD design to also support deadlock  
> detection on local caches and updated design forum [1].
> This, together with the replicated deadlock detection is implemented  
> in trunk (some minor stuff to do still: DLD for aggregation methods  
> like clear and addAll + unit test).
>
> I've also created a benchmark to test what's the throughput (tx/min)  
> between caches running with and without DLD.
> You can find full test description within test class: http://anonsvn.jboss.org/repos/infinispan/trunk/core/src/test/java//org/infinispan/profiling/DeadlockDetectionPerformanceTest.java
> Local DLD does good job (cca 5.5 times better) but replicated DLD  
> does extraordinary: cca 101 better throughput (see attached).
> I think DLD is cool stuff and differentiates us a bit from  
> competition, afaik none of them have a DLD.
>
> One more thing that's worth mentioning: while running DLD tests I've  
> noticed that if all tx acquire locks on keys in same order, then no  
> deadlocks exists. This is logic and might seem obvious, but is not  
> stated anywhere and the performance increase by doing this might be  
> very dramatic. I think we should document this as a best practice  
> when it comes to transactions - any suggestion where?
>
> I also intend to blog about it shortly.
>
> Cheers,
> Mircea
>
> [1] http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4244838#4244838
>
>
> < 
> DLD_local 
> .JPG 
> ><DLD_replicated.JPG>_______________________________________________
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--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org