多卡环境

[deepsmallsea033]

您好，按照您的教程我拉取镜像安装完成后，
import paddle
paddle.fluid.install_check.run_check()
报错了,log 如下
///////////////////////////////////////////////////////
Running Verify Fluid Program ...
W0318 01:57:14.200362 29 device_context.cc:252] Please NOTE: device: 0, CUDA Capability: 61, Driver API Version: 11.0, Runtime API Version: 10.0
W0318 01:57:14.200688 29 device_context.cc:260] device: 0, cuDNN Version: 7.6.
Your Paddle Fluid works well on SINGLE GPU or CPU.
/usr/local/python3.5.1/lib/python3.5/site-packages/paddle/fluid/executor.py:1070: UserWarning: The following exception is not an EOF exception.
"The following exception is not an EOF exception.")
WARNING:root:Your Paddle Fluid has some problem with multiple GPU. This may be caused by:

There is only 1 or 0 GPU visible on your Device;
No.1 or No.2 GPU or both of them are occupied now
Wrong installation of NVIDIA-NCCL2, please follow instruction on https://github.com/NVIDIA/nccl-tests
to test your NCCL, or reinstall it following https://docs.nvidia.com/deeplearning/sdk/nccl-install-guide/index.html
Original Error is:

C++ Call Stacks (More useful to developers):
0 std::string paddle::platform::GetTraceBackString<char const*>(char const*&&, char const*, int)
1 paddle::platform::EnforceNotMet::EnforceNotMet(std::__exception_ptr::exception_ptr, char const*, int)
2 paddle::platform::NCCLContextMap::NCCLContextMap(std::vector<paddle::platform::Place, std::allocatorpaddle::platform::Place > const&, ncclUniqueId*, unsigned long, unsigned long)
3 paddle::framework::ParallelExecutor::ParallelExecutor(std::vector<paddle::platform::Place, std::allocatorpaddle::platform::Place > const&, std::vector<std::string, std::allocatorstd::string > const&, std::string const&, paddle::framework::Scope*, std::vector<paddle::framework::Scope*, std::allocatorpaddle::framework::Scope* > const&, paddle::framework::details::ExecutionStrategy const&, paddle::framework::details::BuildStrategy const&, paddle::framework::ir::Graph*)

Error Message Summary:
ExternalError: Nccl error, unhandled system error at (/paddle/paddle/fluid/platform/nccl_helper.h:114)

Your Paddle Fluid is installed successfully ONLY for SINGLE GPU or CPU!
Let's start deep Learning with Paddle Fluid now
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我打算用多卡训练，现在只能用一块卡，想咨询一下您训练的时候有没有用多卡。

[yeyupiaoling]

@deepsmallsea033 我用的就是多卡，这个错误应该是你没有正确安装NCCL，文档可以看这个：
https://www.paddlepaddle.org.cn/documentation/docs/zh/1.8/install/pip/linux-pip.html#erkaishianzhuang

[deepsmallsea033]

好的感谢