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From Jakob Braeuchi <jbraeu...@gmx.ch>
Subject Re: Commons-lang-2.0 slows down performance
Date Wed, 05 Nov 2003 21:11:24 GMT
hi ilkka,

does the performance improve when you switch back to 1.0.1 ?

jakob

Ilkka Priha wrote:

> Hi
> 
> We've detected extremely slow performance after updating from 
> commons-lang-1.0.1 to commons-lang-2.0. A web page request making a 
> simple db query can take up to 5000 msecs when it took only about 100 
> msecs with the previous version. This happens only when Log4J categories 
> are fully enabled, i.e. DEBUG level is on.
> 
> I made some profiling and found out that over 92% of the time was spent 
> in ClassDescriptor.toString() and further in ToStringBuilder.append(), 
> which was the first commons class in the call chain.
> 
> Most of the method time inside ToStringBuilder was consumed in 
> StringBuffer.extendCapasity(), StringBuffer.append(), String.getChars(), 
> HashMap.get() and other quite normal methods. So the reason must be that 
> the three page refreshes I made generated a huge number of low level 
> calls, e.g. 9828 calls to ClassDescriptor.toString(), 274428 calls to 
> ToStringStyle.appendInternal(), 1038438 calls to 
> ReflectionToStringBuilder.getRegistry(), etc.
> 
> I've not subscribed the common list, but it seems that the new version 
> has some major design flaw making it unsuitable at least for OJB tracing.
> 
> -- Ilkka
> 
> 
> 
> 
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