test_DataParallelTable Failed

[shuni1001]

Hello.

In my machine which has two GTX1080, test_DataParallelTable.lua is failed.
I reinstall the whole torch packages but still there are same problems.

Here is my configurations:
2 * GTX 1080
CUDA 8.0 RC (Because I have 1080 and its architecture is PASCAL, I heard that CUDA-8.0 is the only cuda version that support PASCAL architecture)
Driver version: 367.18 (The only choice for GTX 1080)
OS Ubuntu 14.04

Could you give me a advice to resolve this error?

[albanD]

Hi,
can you try to reintall cutorch and cunn with:

CUDA_ARCH_BIN=6.1 luarocks install cutorch
luarocks install cunn

and during the installation can you make sure that you get at the beginning of the cutorch installation a line similar to:

Compiling for CUDA architecture: 6.1 6.1

[shuni1001]

Thank you albanD.

I solved this problem from your reply.
The problem was not related cutorch or cunn. It was nccl.

From your reply, I check the Makefile the nccl, and there is option "NVCC_GENCODE".
As default option, there isn't compute_61 and code=sm_61
So I modified Makefile as below.

NVCC_GENCODE ?= -gencode=arch=compute_35,code=sm_35
-gencode=arch=compute_50,code=sm_50
-gencode=arch=compute_52,code=sm_52
-gencode=arch=compute_61,code=sm_61

And it works.
The problem was solved.
Thank you.

[borisfom]

Fixed in last release:

I have published updated versions of both 7.5 and 8.0 packages for NCCL:
https://github.com/NVIDIA/nccl/releases/tag/v1.2.2-1%2Bcuda8.0
https://github.com/NVIDIA/nccl/releases/tag/v1.2.2-1%2Bcuda7.5