Re: [Valgrind-users] Using valgrind in combination with ATI drivers?

[Jorrit T. <Jor...@uz...>]

Dimitri Papadopoulos-Orfanos wrote:

> Hi,
>
>> I'm using the closed source ATI drivers for my Radeon 9000 and I want 
>> to use
>> valgrind. But apparently there are similar problems as with Valgrind 
>> and nVidia
>> cards. Does anyone know if there is a similar solution too?
>
>
> What sort of problems? 

I got a crash inside the fglrx driver itself (the program without 
valgrind doesn't
crash). I can give you more details later but at this moment I'm not at 
my linux
machine.

>
>
> It seems there are two sort of problems with nVidia drivers:
>
> * They use MMX/SSE instructions which are not supported by valgrind.
>   This can be disabled by setting __GL_FORCE_GENERIC_CPU.
>   Maybe ATI support a similar environment variable. Do they have some
>   sort of mailing list you could ask to? Otherwise you'll have to
>   revert to some other driver to run valgrind. On the other hand other
>   drivers such as the XFree86 Matrox driver also contains MMX or SSE
>   instructions.
>   This leads me to think that valgrind is most often incompatible
>   with OpenGL programs on Linux, because many OpenGL drivers use MMX
>   instructions that can't be disabled. 

How hard would it be for valgrind to support MMX?

>
>
> * They use NPTL on Red Hat 9, which is not supported by valgrind.
>   This seems to be specific to nVidia and shouldn't affect you.
>   Which Linux distribution are you running? 

I'm using RedHat 9 but I have no problems using valgrind on programs
that don't use OpenGL.

Greetings,