[Qt-creator] Slow cdb

David Schulz david.schulz at digia.com
Tue Jun 4 10:27:34 CEST 2013


Hi Peter,

the warning could result from using the Microsoft Symbol Server.
The problem is that the cdb tries to get all your symbols from this server.
What results in some overhead for all the symbols which are not 
available. For Example the whole Qt and QtCreator libraries.

If you have a Creator checkout from the 2.8 branch you schould be able 
to add a symbol cache to the symbol paths for the cdb in the options 
under Debugger -> CDBPaths -> Symbol Paths -> Insert... -> Symbol Cache...
It is important that you insert the cache before the symbol server 
otherwise the symbols wouldn't get cached and read before the server is 
contacted.

If you are using an older QtCreator add the symbolcache manually. The 
setting can be found under Options -> Debugger -> CDB -> Paths -> Symbol 
Paths -> Edit... in versions < 2.8.

For Example:
cache*C:\dev\symbolcache

srv*http://msdl.microsoft.com/download/symbols


You should also remove the folder from the path with srv*. Otherwise The 
symbols from the server would be cached in two places.

BR David

Am 6/4/2013 9:40 AM, schrieb Peter Kümmel:
> Wasn't there a wiki entry about dead slow cdb or cdb in general?
>
> I think there was something related to the warning
>       WARNING: Unable to verify checksum for ...
> but I couldn't find it any more.
>
> What was the reason for this warning, is this warning related to the slowdown?
> How could I fix the bad cdb speed on my installation side?
>
> (I use cdb to debug gdb support atm)
>
> Peter
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> Qt-creator at qt-project.org
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