[jboss-dev] Small boottime improvement

[Kabir Khan]

On 11 Feb 2010, at 23:23, Bill Burke wrote:

> BTW, my guess is that it is file caching.  Good job though!  Almost a 
> full second shaved off.  Nothing to sneeze about.
> 
> So what's next for optimization?
In dependency the things which had the biggest impact were not breaking out of the resolveContexts() loop and that AbstractDependencyItem was calling controller.getContext() three times when a dependency is not there yet.

For me, profiling the whole app server startup gives too much information and different hotspots don't really stand out that much. I'm creating a series of micro-benchmarks to profile different areas in isolation. Next is trying the different things in jboss-kernel, which is more interesting since it pulls in things like MDR and jboss-reflect. I'll have a look at the ScopeKey lookups I mentioned in http://community.jboss.org/message/525925#525925 today, before trying out other parts of kernel.
> 
> * Is VFS3 in trunk/ now?
> 
> * Did somebody look into whether code guards are being done for logging? 
>  (isDebugEnabled(), etc.)
I believe Ales did this for MC

> 
> * Any possible improvements to creating BeanMetaData?
> 
> * How about making our bean.xml files more coarse grain?  Meaning *A 
> LOT* less implementation details exposed through XML.  You can do IoC in 
> Java you know.  The vast majority of details within all our beans.xml 
> files will never ever change, nor will we want to support users changing 
> this stuff.  If our beans.xml file are reduced to a few bean definitions 
> and classes, would make parsing and creating bean metadata much much faster.
If somebody wants to look into that, some help would be welcome. I've got a feeling my hands will be full the next few weeks :-)
> 
> * I also could resurrect Fast-JAXB, but I didn't want to do that until 
> we got under 10 seconds.
> 
> For the MC team, I think the biggest focus should be profiling and 
> optimizing Minimal.
> 
> 
> Kabir Khan wrote:
>> I actually did a few runs on each server first, but had loads of apps open so I rebooted
>> On 11 Feb 2010, at 12:33, Jaikiran Pai wrote:
>> 
>>> Kabir Khan wrote:
>>>> 
>>>> One strange thing is that the first time I started each server they took loads longer than the other times, does somebody know the reason for that? 
>>>> 
>>> Wild guess - Perhaps, JBoss Messaging takes time to create the JBM 
>>> tables for the first run. The second run the tables are already present 
>>> in JBOSS_HOME/data folder so i guess it's skipped. Maybe deleting the 
>>> data folder before starting the server, the second time, will show no 
>>> significant difference between the two runs.
>>> 
>>> regards,
>>> -Jaikiran
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>> 
>> 
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> 
> -- 
> Bill Burke
> JBoss, a division of Red Hat
> http://bill.burkecentral.com
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