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> 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>
To: "Ståle W. Pedersen" <spederse(a)redhat.com>
Cc: "Galder Zamarreño" <galder(a)redhat.com>, "John O'Hara"
<johara(a)redhat.com>, "Jeremy Whiting" <jwhiting(a)redhat.com>,
"Andrig Miller" <anmiller(a)redhat.com>, "Steve Ebersole"
<steve(a)hibernate.org>, "infinispan-dev"
<infinispan-dev(a)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(a)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(a)jboss.org
twitter.com/maniksurtani
Platform Architect, JBoss Data Grid
http://red.ht/data-grid