Get error when use 3 or 4 gpus to train model

[yumeihong]

I installed NCCL to use more gpus to train model.
install step:

1. git clone https://github.com/NVIDIA/nccl.git
2. cd nccl
3. sudo make install -j8
4. remove Makefile.config USE_NCCL comment

When I train model I use below instruction:
$CAFFE_ROOT/build/tools/caffe train --solver="models/ssd/${PROJECT}/initial/solver.prototxt" --weights="models/ssd/${PROJECT}/initial/${PRETRAINED}" -gpu 0,1,2

it get error:

But I can use 2 gpus to train.
Did I loss something instruction?

[mathmanu]

Hi, I think I did not understand the problem that you are facing. Specifically:
Yow wrote: "But I can use 2 gpus to train."
If you can use 2 gpus to train, then what is the issue?

[yumeihong]

Hi, I think I did not understand the problem that you are facing. Specifically:
Yow wrote: "But I can use 2 gpus to train."
If you can use 2 gpus to train, then what is the issue?

Hi ,I get error message when I use 3 or 4 gpus. But I can use 2 gpus to train.