[Qt-interest] Performance problem with Qt4.6.2 and QString on lucid ubuntu

[Abdelrazak Younes]

Hello,

With Qt4.6.2 my application sudenly rquires a lot of CPU under Linux 
(about 40% cpu, compiled with gcc-4.4 ubuntu lucid). A quick oprofile 
reveals that most of the time is in QBasicAtomicInt::deref() and 
QString::~QString().

The same application compiled with MSVC-2008 on Windows takes basically 
no-cpu (less than 1%).
The same application compiled with Qt4.5.2 on a Debian system doesn't 
have this problem either...

In my application I do a lot of data passing from the core to the gui 
using QStrings and QStringList. Either by copy and using const reference.

Any idea someone?

Abdel.