Gpu hyper threading

[Pony080905]

Why don't we have Gpu hyper threading

[ShadowCaptain]

Why don't we have Gpu hyper threading

 

Because they have thousands of cores for example a GTX 980 has like 2048 Cuda Cores!!

[blu4]

Nvidia GPU Boost 1.0/2.0

AMD OverDrive

 

Whoops- that's OC

[Pony080905]

Nvidia GPU Boost 1.0/2.0

AMD OverDrive

That's overclocking

[Redsun20]

That's overclocking

No not really, that is not.

[Enderman]

its not necessary

the GPUs have enough cores

hyperthreading would just double the cores and half the performance of each, which would decrease performance more than it would help

[Enderman]

No not really, that is not.

yeah it is...?

it increases the clock speed...thats called overclocking

[Manny Calavera]

Why don't we have Gpu hyper threading

 

Because they have thousands of cores for example a GTX 980 has like 2048 Cuda Cores!!

we...we do tho...

Asynchronous Shading

 

Hyperthreading is doing more things with one cycle, because not everything might be used.

 

Maxwell have 32 units while GCN 1.2 has 8.

 

Wait for DX12

[Redsun20]

yeah it is...?

it increases the clock speed...thats called overclocking

Yes but generally overclocking is actually telling it to turn up the speed, while GPU Boost and Overdrive boost whenever they have good conditions. It is like Turbo Boost on CPU's. That's not overclocking now is it? Just think of it that way and it technically isn't

[Stefan1024]

Since GPUs have a much simpler core than a CPU the pipeline is much shorter. Therefor a pipeline stall of flush because of a branch or dependence of a previous command is less likely. HT is only a trick to half the pipeline length of a thread. But it also half the frequency of every thread!

 

2 cores @ 4 GHz with HT = 4 threads @ 2 GHz

 

As you can see it improves the multicore-performance by downgrading the single thread performance. But GPUs are already very good for massive parallel workload.

It will just lower the performance implementing HT on a GPU.

[Manny Calavera]

Since GPUs have a much simpler core than a CPU the pipeline is much shorter. Therefor a pipeline stall of flush because of a branch or dependence of a previous command is less likely. HT is only a trick to half the pipeline length of a thread. But it also half the frequency of every thread!

 

2 cores @ 4 GHz with HT = 4 threads @ 2 GHz

 

As you can see it improves the multicore-performance by downgrading the single thread performance. But GPUs are already very good for massive parallel workload.

It will just lower the performance implementing HT on a GPU.

no that would be stupid lol. we dont see double perf. with hyperthreading because the workload may not be / cant not be multithreaded, so some instructions are idling. or just optimization thing.

so its true that we might only get performance of 1 core with 2 hyperthreaded cores.

 

there are actually two instructions: one integer and one fpu being calculated in one cycle. with no hyperthreading only one can be at a time, the other is just idling. Intel actually disables hyperthreading on i5`s.

AMD is also moving to hyperthreading, its very efficient use of cores.

 

Multi threaded workload can be no problem done on less cores.

[Enderman]

Yes but generally overclocking is actually telling it to turn up the speed, while GPU Boost and Overdrive boost whenever they have good conditions. It is like Turbo Boost on CPU's. That's not overclocking now is it? Just think of it that way and it technically isn't

yeah it is overclocking

overclocking means increasing frequency above default or stock limits

GPU boost increases the clock speed above stock so yes it is overclocking

 

just because its not manual overclocking does not mean that it isnt overclocking