[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1258) startup time improvements

[Tyler Van Gorder (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1258?page=comments#action_24678 ] 

Tyler Van Gorder commented on HHH-1258:
---------------------------------------

Having the Configuration object around is not as big a concern for us in the development environment. Most of our machines have 2G of memory.  And this is an option that would ONLY be used in a development scenero.

So If I am hearing you correctly, the module would need to be made thread-safe and could be ported to the 3.x code base (assuming we are not concerned with keeping the Configuration object hanging out.)?

Perhaps if I have more time in the coming months I might try doing this properly. Max, if you have time I sure would appreciate to pick your brain about which entry points into the session factory implementation would require hooks to dynamically load the configuration. 

Thanks.




> startup time improvements
> -------------------------
>
>          Key: HHH-1258
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1258
>      Project: Hibernate3
>         Type: Improvement

>   Components: core
>     Versions: 3.1 rc3
>     Reporter: Max Rydahl Andersen
>     Assignee: Max Rydahl Andersen

>
>
> while doing some basic startup perf testing the following were found - this issue is mainly to track what I find, and then fix it:
> Initial tests where 100 classes, 30 sec for buildSessionFactory
> setting hibernate.cglib.use_reflection_optimizer false and it is 10 sec for buildSessionFactory.
> (maybe we should autodetect which jdk we are running on and disable it per default for 1.4/1.5 - needs to validate runtime impact)
> Another (22%) time stealer is the discovery of getter/setters - in worst case it iterates over all declared methods per property.
> (alternatively we could cache/sort this list or make a more efficient implementation if a class only contain default property accessors)
> Other 20% of the time is done in net.sf.cglib related classes for build time enhancement.
> The rest of the time is Configuration creation (can be cached) and other iteration code.
> (p.s. don't take the % numbers as hard values - these are definitly affected by how many methods/classes you have; this underlying tests
> is done on pojos with a "high" method count (approx 100)

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