There seems to be a single (global) reentrant lock which is acquired on any put; I don't know much about the module design, but there is a comment close to the lock acquisition mentioning a need to flush an operations queue to avoid a deadlock. Could it just make sure to reorder keys, so that deadlocks are avoided? On 18 September 2012 16:26, Manik Surtani <manik(a)jboss.org&gt; wrote: > 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(a)redhat.com&gt; 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(a)jboss.org&gt; > To: "Ståle W. Pedersen" <spederse(a)redhat.com&gt; > Cc: "Galder Zamarreño" <galder(a)redhat.com&gt;, "John O'Hara" > <johara(a)redhat.com&gt;, "Jeremy Whiting" <jwhiting(a)redhat.com&gt;, "Andrig Miller" > <anmiller(a)redhat.com&gt;, "Steve Ebersole" <steve(a)hibernate.org&gt;, > "infinispan-dev" <infinispan-dev(a)lists.jboss.org&gt; > 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(a)redhat.com&gt; 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(a)jboss.org > twitter.com/maniksurtani > > Platform Architect, JBoss Data Grid > http://red.ht/data-grid > > > -- > Manik Surtani > manik(a)jboss.org > twitter.com/maniksurtani > > Platform Architect, JBoss Data Grid > http://red.ht/data-grid > > > _______________________________________________ > infinispan-dev mailing list > infinispan-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/infinispan-dev _______________________________________________ infinispan-dev mailing list infinispan-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/infinispan-dev