[infinispan-dev] Issue with cache blocks for local read-only cache

[Manik Surtani]

Agreed.  

This locking appears to be in the 2LC integration code to guard a local collection though - there must be better, non-blocking ways to guard this - if it is needed at all for RO entities.  

- M

On 18 Sep 2012, at 15:18, Andrig Miller <anmiller at redhat.com> wrote:

> What I find interesting, is that in this use case, READ_ONLY concurrency strategy and a local cache (no invalidation and no replication), there is no need to do any locking.
> 
> If we can get to a solution without any locking that would be ideal.
> 
> Andy
> 
> From: "Manik Surtani" <manik at jboss.org>
> To: "Ståle W. Pedersen" <spederse at redhat.com>
> Cc: "Galder Zamarreño" <galder at redhat.com>, "John O'Hara" <johara at redhat.com>, "Jeremy Whiting" <jwhiting at redhat.com>, "Andrig Miller" <anmiller at redhat.com>, "Steve Ebersole" <steve at hibernate.org>, "infinispan-dev" <infinispan-dev at lists.jboss.org>
> Sent: Tuesday, September 18, 2012 8:13:43 AM
> Subject: Re: Issue with cache blocks for local read-only cache
> 
> Looking at your profiler snapshot, these locks are in the Hibernate 2nd level cache implementation for Infinispan.  Galder, any ideas?
> 
> - M
> 
> On 18 Sep 2012, at 13:43, Ståle W. Pedersen <spederse at redhat.com> wrote:
> 
> hi galder and manik, sorry for sending this mail to so many, but we've ran into a issue that prevents us from further scaling of the specjenterprise2010 benchmark.
> 
> so when doing specjenterprise2010 benchmark testing we've seen a lot of blocks caused by the entity/query cache. we've been testing with only caching a simple entity bean that's read-only and queries related to this entity (selects).
> 
> here is a screenshot of the hotspot found:https://dl.dropbox.com/u/30971563/specjent_block.png
> 
> here is the standalone.xml: https://dl.dropbox.com/u/30971563/standalone-full.xml
> 
> here is the orm.xml: https://dl.dropbox.com/u/30971563/order_orm.xml
> 
> what we don't understand is why there are so many puts into the cache for an object that is marked as read-only. when we're testing without caching we do not see any blocks.
> 
> any help/ideas would be great. if anyone want a jprofiler snapshot of the run, let me know.
> 
> regards, ståle
> -- 
> JBoss Performance Team Lead
> JBoss by Red Hat
> 
> --
> Manik Surtani
> manik at jboss.org
> twitter.com/maniksurtani
> 
> Platform Architect, JBoss Data Grid
> http://red.ht/data-grid

--
Manik Surtani
manik at jboss.org
twitter.com/maniksurtani

Platform Architect, JBoss Data Grid
http://red.ht/data-grid

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/infinispan-dev/attachments/20120918/cc5c5e99/attachment-0001.html