May 2008 - jboss-dev-forums - Jboss List Archives

[Design of Messaging on JBoss (Messaging/JBoss)] - MaxIO, MinFiles and JournalFileSize

by clebert.suconic＠jboss.com

When you initialize libaio, you also initialize the number of AIO positions you will have on the kernel. That is the maximum number of pending you writes you could have on the kernel. There is an almost hard limit on the OS, I guess it's 25K (I say almost.. because the variable it's not documented, or if it is.. it's hard to find it). After few tests I have done, I've been able to get very good numbers, using the StoreManager directly. But the best number I could get to my disk was 10000. With that we can't have more than 2 files opened with AIO. Since the journal is append only, I guess it would be okay to make it a little bigger, since we won't make any reads on the file. I will make the MaxIO configurable on the Configuration, but IMO the default for min files should be 2, and the size of each journal at 100M. Putting the file at 100M would minimize the number of closes/opens you would do in production also. When you close a file in AIO, you need to wait all the pending writes to complete before you can actually close it and move to the next file. (Maybe I should use an executor to close the file to avoid the eventual latency, but if you could minimize the number of closes on AIO it would still a good practice IMO) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150454#4150454 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150454

17 years, 11 months

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[Design of Messaging on JBoss (Messaging/JBoss)] - Re: log.isTraceEnabled() and performance

by ataylor

The trouble is with the second piece of code, changes to the log level at runtime might not get picked up. saying that I'd prefer to have the performance increase and maybe lose some logging. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150450#4150450 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150450

17 years, 11 months

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[Design of JBoss Portal] - JBoss Portal 2.6.5 released

by thomas.heute＠jboss.com

JBoss Portal 2.6.5 has been released: http://blog.jboss-portal.org/2008/05/jboss-portal-265ga-released.html View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150445#4150445 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150445

17 years, 11 months

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[Design of JCA on JBoss] - Re: JBAS-3632

by adrian＠jboss.org

I don't understand your question/comment. If it is "how do I reproduce it?" then you need to set up some ejb calls that does something like the following. 1) Start a transaction, e.g. invoke a CMT/Required ejb method 2) Make an ejb invocation on a different bean that opens a connection handle but doesn't close it (e.g. like the thread local connection tests in the testsuite) 3) Force the transaction to timeout Previously we would wait until the transaction ends when the method in step (1) returns before checking for unclosed connections. This allows something to close the connection that was "cached". But since jboss-4.2.x the transaction timeout does the rollback which can will give a spurious warning in this case. NOTE: This usage is an anti-pattern and doesn't cause any real problems which is why I'm not really too worried about this issue. How it gets fixed is a different issue. It's tied up with the other JIRA issue about the CachedConnectionManager rewrite that is required such that it better understands the ejb lifecycle(s) and the "Debug" feature needs redoing so it isn't so contentious on the WeakHashMap. Search for other forum threads and links from the JIRA issues for more information and ideas. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150440#4150440 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150440

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[Design of Messaging on JBoss (Messaging/JBoss)] - Re: JBoss 2.0 Thread model

by timfox

"david.lloyd(a)jboss.com" wrote : | As far as using a concurrent queue - perhaps you could squeeze out a tiny bit more performance, but unless it shows up as a blip on a profiler, I'm not going to bother because frankly I doubt that there will be significant (unwanted) contention for the lock. (Remember that the purpose is to serialize access, after all) After profiling JBM, this actually appears as the single largest point of contention in the application (the second being the MINA DefaultIOSessiondataStructureFactory) contributing to about 12% performance degradation when sending / consuming a lot of messages. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150439#4150439 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150439

17 years, 11 months

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[Design of JBoss Profiler] - Re: Crash when stopping JbossProfiler 2.0.Beta 1

by jesper.pedersen

The server is unable to find the definition of the class - which is strange since the class is passed in as a parameter to the method. How do you set up your application ? loader-repository and so on View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150434#4150434 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150434

17 years, 11 months

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[Design of JBoss Profiler] - Re: JBoss Profiler 2 in JBoss AS 4.2.2 - Does not gather any

by jesper.pedersen

This have been fixed in the Beta1 release at http://www.jboss.org/jbossprofiler/downloads/. It now logs a warning about the missing library. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150426#4150426 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150426

17 years, 11 months

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[Design of JBoss Profiler] - Re: Problem in setting up JBoss Profiler 2 in Jboss 4.2.1

by jesper.pedersen

This have been corrected in the Beta1 release at http://www.jboss.org/jbossprofiler/downloads/ View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150425#4150425 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150425

17 years, 11 months

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[Design of JBoss Profiler] - Re: JBoss Profiler 2

by jesper.pedersen

The official Beta1 is out: http://www.jboss.org/jbossprofiler/downloads/ The profiler will now follow the standard release cycle of all JBoss products. Changes in this release: * Initial Ant tasks * Various improvements * Bug-fixes Feel free to provide feedback in this thread. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150424#4150424 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150424

17 years, 11 months

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[Design of JBoss internal QA (Test Suite)] - Re: Start contributing

by prabhat.jha＠jboss.com

Hi, Will you be interested in QA of JBoss Portal? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150422#4150422 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4150422

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jboss-dev-forums May 2008