Learning Forum

[zhou333708124]

I have 2 Titan V in my workstation, and when I use multi-GPU solver I found that both two GPU take lower usage. One is 59% in average and the other is 68%. But when I use single-GPU solver that usage is 97%-98% all times. It's calculation speed can be even faster than multi-GPU solver

The problem is not about the HPC license, and no matter how many particles I settle down, the usage do not change anymore. So what makes the problem happend and how can I solve the problem?

[zhou333708124]

Already solved.

If you have Titan or Geforce Series GPU for multi-GPU solver, you should enable TCC compute mode rather than WDDM mode. Although those GPU are still not getting full usage, they can work together much better than before, all those usage have 10% more improvment and more effictive collaboration.

But one thing important to know is ONLY Titan Series support TCC mode with nothing to exchange, Geforce GPU need a exchange in it's Driver... I know how to do that but the page is full Chinese so I just provide the TitanV TCC mode enable method.

First, start cmd in administrater permission.

Second, input 'nvidia-smi' to find which GPU you want change to TCC mode. I suppose there is GPU4.

Third, input 'nvidia-smi -i 4 -dm 1', and input 'nvidia-smi' again to ensure GPU0 is in WDDM*. When '*' appear that means you have done correctly.

          (If there is GPU0 you should input 'nvidia-smi -i 0 -dm 1' )

Last, restart your computer. Start cmd and input 'nvidia-smi' again and you will find It's already in TCC mod. 

The GPU in TCC mode has NO VIDEO EXPORT!!! NO VIDEO EXPORT!!! So you must get another GPU to export video such as GTX 1050Ti...