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From "Neale Rudd" <ne...@metawerx.net>
Subject Re: TomEE startup performance
Date Sun, 15 Apr 2012 16:16:13 GMT
Thanks Romain,

I've been doing some simple profiling and investigating the single-thread 
issue further.

The findAnnotations method seems to be the slowest area on the hardware 
we're testing, and with a large app it accounts for over 85% of the startup 
time.

Could that be multithreaded without synchro issues?

I'm doing some work with Yourkit next to dig a bit deeper.

Best Regards,
Neale


----- Original Message ----- 
From: "Romain Manni-Bucau" <rmannibucau@gmail.com>
To: <users@openejb.apache.org>
Sent: Monday, April 16, 2012 1:51 AM
Subject: Re: TomEE startup performance


> Hi Neale,
>
> well you find a big part of the overhead: the scanning, you can add all
> which is not done by tomcat (JPA, EJB init, CDI...). Well maybe tomcat +
> webapp startup should be compared to a tomee + webapp startup.
>
> you spoke about multithreading which seems to be a good idea but it can
> lead to a lot of issues and maybe too much synchro = slower startup
>
> to have a good idea of these use a profiler, you'll find very interesting
> info.
>
> - Romain
>
>
> 2012/4/14 Neale Rudd <neale@metawerx.net>
>
>> Hi Guys,
>>
>> Could someone explain in some more detail what exactly causes the slower
>> startup time in TomEE compared to Tomcat?
>>
>> I imagine it's parsing classes, annotations etc.. but haven't looked at
>> that area of the code too much yet.
>>
>> One thing I've noticed in our testing, is that it seems to be mostly
>> single-threaded, sitting at 100% on one core for most of the startup, 
>> which
>> of course is painful on multi-core low-Ghz CPUs.  Perhaps there could be 
>> a
>> -D flag to specify the number of threads to use for doing whatever it's
>> doing, like Java with it's ParallelGC threads.
>>
>> The startup time should be reduced at the cost of higher initial CPU 
>> load.
>>  Ideas?
>>
>> Best Regards,
>> Neale Rudd
>>
> 


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