Hi,
that did not seem to help, the lock trace remains exactly the same.
Locks also occur on EntityManager.clear() btw:
at java.util.concurrent.locks.LockSupport.park(Unknown Source)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(Unknown
Source)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(Unknown
Source)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(Unknown Source)
at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(Unknown
Source)
at java.util.concurrent.locks.ReentrantLock.lock(Unknown Source)
at
org.apache.openjpa.slice.ReentrantSliceLock.lock(ReentrantSliceLock.java:46)
at
org.apache.openjpa.slice.DistributedBrokerImpl.lock(DistributedBrokerImpl.java:141)
at
org.apache.openjpa.kernel.BrokerImpl.beginOperation(BrokerImpl.java:1927)
at org.apache.openjpa.kernel.BrokerImpl.detachAll(BrokerImpl.java:3396)
at
org.apache.openjpa.kernel.DelegatingBroker.detachAll(DelegatingBroker.java:1206)
at
org.apache.openjpa.persistence.EntityManagerImpl.clear(EntityManagerImpl.java:1158)
I might try to create a small testcase to show the problem..
-----Ursprüngliche Nachricht-----
Von: Pinaki Poddar [mailto:[email protected]]
Gesendet: Dienstag, 13. September 2011 06:49
An: [email protected]
Betreff: Re: OpenJPA (with slice) multithreaded scaling issues
Michael,
The lock contention seems to be at a different place than at JDBC layer.
Can you please set
openjpa.jdbc.SQLQueryCache=false and see if th elock contention is reduced?
-----
Pinaki Poddar
Chair, Apache OpenJPA Project
--
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