[Bf-committers] gDEBugger GDC Video: Advanced OpenGL, OpenGL ES and OpenCL debugging and profiling using gDEBugger

Konrad Wilhelm Kleine konrad at konradwilhelm.de
Fri Mar 26 08:25:55 CET 2010


maby BuGLe can turn out to be helpful:


Am 25.03.2010 00:34, schrieb Yves Poissant:
> Not cheap but very usefull indeed. It is no magic however. You need to 
> already have experience with OpenGL, The debugger can flag missused or 
> overused API calls as well as deprecated OpenGL APIs. Several statistics are 
> reported too. The most usefull output is the OpenGL calls dump per frame. 
> With instrumentation drivers on the graphics card, it is informative to 
> watch different counters while the appliaction is running.
> That said, this debugger is not a replacement for true application profiler.
> The trial version is quite crippled but it can give you a good idea of what 
> it can do. You can obtain another 7 days trial extension from the company. 
> For proper evaluation, you will need constant use for several days in order 
> to fully understand all the tools it includes. No need for special build 
> versions for your application. The debugger intercept all calls to the 
> OpenGL driver.
> One interresting discovery I made while using this debugger is that all the 
> OpenGL optimizing tricks that were presented at Siggraph in previous years 
> do not apply with the new graphics cards. These tricks are oftentime 
> detrimental to optimizing OpenGL on new GPUs. So take care with old 
> optimizing advises you will find on the web.
> One issue I found with the locked version is that if you want to profile OGL 
> on different graphics cards, you need to change the graphics card and its 
> drivers on that locked-on computer. Not an easy proposition. That said, you 
> can buy 3 locked licence for the price of a floating one.
> Also, for the price of that tool, it is not a tool that I constantly use. I 
> use it for short but intensive profiling periods and then don't use it for 
> loooong period of times. So if I had to pay for the tool myself (my employer 
> did), I would think more than twice. Especially given that now that I've 
> used this profiler, I have a pretty good idea of how I would profile an 
> OpenGL application without the tool and just by using the instrumentation 
> drivers for OpenGL and the profiling API that are provided for free by 
> Nvidia.
> I'm not aware of any truely equivalent free software anywhere. There are 
> some remnents of such free tools from the times of SGI OpenGL but they are 
> essentialy of no use today.
> Yves
> ----- Original Message ----- 
> From: "Dalai Felinto" <dfelinto at gmail.com>
> To: "bf-blender developers" <bf-committers at blender.org>
> Sent: Wednesday, March 24, 2010 12:38 PM
> Subject: Re: [Bf-committers] gDEBugger GDC Video: Advanced OpenGL,OpenGL ES 
> and OpenCL debugging and profiling using gDEBugger
>> Complementing:
>> gdebugger has a trial for 7 days and is cross-plataform. The price is not
>> cheap ($790 Node Locked and $2450 Floating - * Linux has only floating) 
>> but
>> I believe they are other tools out there that can do similar and are open
>> software. Not sure about interface, performance, ...
>> Cheers,
>> Dalai
>> 2010/3/24 Dalai Felinto <dfelinto at gmail.com>
>>> Hi folks,
>>> I watched the following video and I'm quite impressed:
>>> http://nvidia.fullviewmedia.com/gdc2010/13-avi-shapira.html
>>> In BGE current profiling the whole Rasterizer is keep as an unique entry.
>>> With this debugger you can actually see where is the actual bottleneck
>>> (Fragment, Vertex, ...). The same can be applied for Blender I believe.
>>> When I find time I'll try to run it on simple BGE demos. I have a feeling
>>> that this can help to fix some bugs we have (e.g. alpha flickering). Also
>>> from a user perspective, that sounds as a handy tool to help
>>> game optimization (assuming we can tackle the main BGE GL problems that 
>>> may
>>> be present).
>>> Maybe an interesting GSOC for someone? (to implement openGL Rasterizer
>>> profile and fix/optimize BGE openGL errors)?
>>> Cheers,
>>> Dalai
>>> http://blenderecia.orgfree.com
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