Hi,
I am trying to use two GPUs in parallel, but the speed is similar to that
of a single GPU. When I checked the output file (pasted below), I observed
that when I use single GPU, it says "Peer to Peer support: ENABLED"
However, when I use both GPUs, the output is
"Peer to Peer support: DISABLED"
The output of both runs are given below:
*1) Two GPUs in parallel*
|------------------- GPU DEVICE INFO --------------------
|
| Task ID: 0
| CUDA_VISIBLE_DEVICES: 0,1
| CUDA Capable Devices Detected: 2
| CUDA Device ID in use: 0
| CUDA Device Name: Tesla K20m
| CUDA Device Global Mem Size: 4799 MB
| CUDA Device Num Multiprocessors: 13
| CUDA Device Core Freq: 0.71 GHz
|
|
| Task ID: 1
| CUDA_VISIBLE_DEVICES: 0,1
| CUDA Capable Devices Detected: 2
| CUDA Device ID in use: 1
| CUDA Device Name: Tesla K20m
| CUDA Device Global Mem Size: 4799 MB
| CUDA Device Num Multiprocessors: 13
| CUDA Device Core Freq: 0.71 GHz
|
|--------------------------------------------------------
|---------------- GPU PEER TO PEER INFO -----------------
|
| Peer to Peer support: DISABLED
|
| (Selected GPUs cannot communicate over P2P)
|
|--------------------------------------------------------
*2) Single GPU usage:*
|------------------- GPU DEVICE INFO --------------------
|
| Task ID: 0
| CUDA_VISIBLE_DEVICES: 0
| CUDA Capable Devices Detected: 1
| CUDA Device ID in use: 0
| CUDA Device Name: Tesla K20m
| CUDA Device Global Mem Size: 4799 MB
| CUDA Device Num Multiprocessors: 13
| CUDA Device Core Freq: 0.71 GHz
|
|--------------------------------------------------------
|---------------- GPU PEER TO PEER INFO -----------------
|
| Peer to Peer support: ENABLED
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Received on Thu Aug 11 2016 - 14:00:04 PDT
