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我想用TensorFlow使用mpi。對於這樣的代碼的例子,see this OpenAI baselines PPO code。它告訴我們,運行以下命令:在tensorflow中使用mpirun -np X:是否受限於GPU的數量?
$ mpirun -np 8 python -m baselines.ppo1.run_atari
我有一臺機器與一個GPU(與12GB的RAM)和Tensorflow 1.3.0安裝,使用Python 3.5.3。當我運行這段代碼,我得到以下錯誤:
2017-09-24 17:29:12.975967: I tensorflow/core/common_runtime/gpu/gpu_device.cc:955] Found device 0 with properties:
name: TITAN X (Pascal)
major: 6 minor: 1 memoryClockRate (GHz) 1.531
pciBusID 0000:01:00.0
Total memory: 11.90GiB
Free memory: 11.17GiB
2017-09-24 17:29:12.975990: I tensorflow/core/common_runtime/gpu/gpu_device.cc:976] DMA: 0
2017-09-24 17:29:12.975996: I tensorflow/core/common_runtime/gpu/gpu_device.cc:986] 0: Y
2017-09-24 17:29:12.976011: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1045] Creating TensorFlow device (/gpu:0) -> (device: 0, name: TITAN X (Pascal), pci bus id: 0000:01:00.0)
2017-09-24 17:29:12.987133: I tensorflow/core/common_runtime/gpu/gpu_device.cc:955] Found device 0 with properties:
name: TITAN X (Pascal)
major: 6 minor: 1 memoryClockRate (GHz) 1.531
pciBusID 0000:01:00.0
Total memory: 11.90GiB
Free memory: 11.17GiB
2017-09-24 17:29:12.987159: I tensorflow/core/common_runtime/gpu/gpu_device.cc:976] DMA: 0
2017-09-24 17:29:12.987165: I tensorflow/core/common_runtime/gpu/gpu_device.cc:986] 0: Y
2017-09-24 17:29:12.987172: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1045] Creating TensorFlow device (/gpu:0) -> (device: 0, name: TITAN X (Pascal), pci bus id: 0000:01:00.0)
[2017-09-24 17:29:12,994] Making new env: PongNoFrameskip-v4
2017-09-24 17:29:13.017845: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:893] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2017-09-24 17:29:13.022347: I tensorflow/core/common_runtime/gpu/gpu_device.cc:955] Found device 0 with properties:
name: TITAN X (Pascal)
major: 6 minor: 1 memoryClockRate (GHz) 1.531
pciBusID 0000:01:00.0
Total memory: 11.90GiB
Free memory: 104.81MiB
2017-09-24 17:29:13.022394: I tensorflow/core/common_runtime/gpu/gpu_device.cc:976] DMA: 0
2017-09-24 17:29:13.022415: I tensorflow/core/common_runtime/gpu/gpu_device.cc:986] 0: Y
2017-09-24 17:29:13.022933: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1045] Creating TensorFlow device (/gpu:0) -> (device: 0, name: TITAN X (Pascal), pci bus id: 0000:01:00.0)
2017-09-24 17:29:13.026338: E tensorflow/stream_executor/cuda/cuda_driver.cc:924] failed to allocate 104.81M (109903872 bytes) from device: CUDA_ERROR_OUT_OF_MEMORY
(這是唯一的錯誤消息的第一部分,它是非常長的,但是我覺得這個開頭部分是看最重要的事情。)
但是,如果我使用mpirun -np 1
運行該命令。
我在網上搜索,我發現了一個repository from Uber它說,「要與4個GPU的機器上運行」我需要使用:
$ mpirun -np 4 python train.py
我只是想確認mpirun -np X
意味着X
有限通過機器上GPU的數量,假設我們正在運行的是TensorFlow程序。