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post #261 of 632
post #262 of 632
Quote:
Originally Posted by Mahigan View Post

I am not disputing that Pascal can get a boost under light loads... never have. As for 3D Mark Time Fly... See concurrent vs parallel execution. All of the current games supporting Asynchronous Compute make use of parallel execution of compute and graphics tasks. 3D Mark Time Fly support concurrent. It is not the same Asynchronous Compute.

Concurrency fills in gaps which are in the execution pipeline. Parallelism executes two tasks at the same time.


Notice the context switch involved?

If 3D Mark Time fly were using Parallel executions then there would be synchronization points between the two contexts (Graphics and Compute). There would also be pipeline stalls on Maxwell GPUs. Both the pipeline stalls and the flush required for a synchronization point would add latency thus leading to Maxwell losing performance when running this variant of Asynchronous compute. We do not see Maxwell losing performance under 3D Mark Time Spy. We see a tiny performance boost. Thus 3D Mark Time Spy is not running Asynchronous Compute + graphics. You see parallel executions = Asynchronous Compute + Graphics. Concurrent execution = Asynchronous Compute. They are not the same thing.
They can but that is not what 3D Mark is doing.
That is from 3DMark and can be found in the PC Per review. http://www.pcper.com/reviews/Graphics-Cards/3DMark-Time-Spy-Looking-DX12-Asynchronous-Compute-Performance

Yeah... even PCPer went a step further and attacked "AMD Fanboys" when in reality... PC Per do not even know the difference. Tech journalism.... rolleyes.gif

What is concurrency?
https://en.wikipedia.org/wiki/Concurrent_computing
So yeah... 3D Mark does not use the same type of Asynchronous compute found in all of the recent game titles. Instead.. 3D Mark appears to be specifically tailored so as to show nVIDIA GPUs in the best light possible. It makes use of Context Switches (good because Pascal has that improved pre-emption) as well as the Dynamic Load Balancing on Maxwell through the use of concurrent rather than parallel Asynchronous compute tasks. If parallelism was used then we would see Maxwell taking a performance hit under Time Fly as admitted by nVIDIA in their GTX 1080 white paper and as we have seen from AotS.



GCN can handle these tasks but performs even better when Parallelism is thrown in as seen in the Doom Vulkan results. How? By reducing the per Frame latency through the parallel executions of Graphics and Compute Tasks. A reduction in the per-frame latency means that each frame takes less time to execute and process. The net result is a higher frame rate. 3DMark lacks this. AotS makes use of both parallelism and concurrency... as does Doom with the new Vulkan patch. See below...


If 3D Mark Time Fly had implemented a separate path and enabled both concurrency and parallelism for the FuryX... it would have caught up to the GTX 1070. No joke.

If both AMD and nVIDIA are running the same code then Pascal would either gain a tiny bit or even lose performance. This is why Bethesda did not enable the Asynchronous Compute + Graphics from the AMD path for Pascal. Instead... Pascal will get its own optimized path. They will also call it Asynchronous Compute... people will think it is the same thing when in reality... two completely different things are happening behind the scene.

See why understanding what is actually happening behind the scenes is important rather than just looking at numbers? Not all Asynchronous Compute implementations are equal. You would do well to take note of this.

Where are the tech journalists these days?

question then seeem to be to ask this, did Nvidia pay off Futuremark then?
or is there another reason for this to be implemented this way and not to show graphics compute?
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post #263 of 632
this seems too much of a coincidence for Futuremark and Nvidia to not have colluded.
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post #264 of 632
i wonder who is able to run codexl on that test? will be very interesting to see what is actually going on on nvidia..
post #265 of 632
Quote:
We do not see Maxwell losing performance under 3D Mark Time Spy. We see a tiny performance boost. Thus 3D Mark Time Spy is not running Asynchronous Compute + graphics
cause you say so ? nope redface.gif
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post #266 of 632
Quote:
Originally Posted by ChevChelios View Post

cause you say so ? nope redface.gif
hmm let me guess

dx12/vulkan games comes all show regression on maxwell cards when async is on

random "async" test comes actually shows something different "its all good nvidia can do async"
post #267 of 632
Quote:
Originally Posted by magnek View Post


When AMD fans point to AotS nVidia fans say "it's just a benchmark". But because Pascal is finally showing a small amount of gains with async in an actual 3DMark bench all of a sudden it matters 100%.

LMAO lachen.gif

This about sums it up.
post #268 of 632
Quote:
Originally Posted by ChevChelios View Post

cause you say so ? nope redface.gif

Oh my god, 2k posts and you go out and call Mahigans' post BS. I am about to block you, because you are just not contributing with absolutely ANYTHING (instead bash, lies, and call other people liars).
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post #269 of 632
Quote:
Originally Posted by airfathaaaaa View Post

dx12/vulkan games comes all show regression on maxwell cards when async is on

Source? Again, async should be disabled on the driver level for Maxwell.
post #270 of 632
cocurrency =/= Asynchronous. Perhaps we should call Time Spy Cocurrency test. biggrin.gif
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