cuda - OSX 上的 NVIDIA Cuda 错误 "all CUDA-capable devices are busy or unavailable"

Question

经常，即使对于像 cudaMalloc 这样的简单调用，我也会让 CUDA 库完全失败并返回错误 46(“所有支持 CUDA 的设备都忙或不可用”)。如果我重新启动计算机，代码就会成功运行，但这远非理想。这个问题显然是quite common .

我的设置如下:

• OSX 10.6.8
• NVIDIA CUDA 驱动程序:CUDA 驱动程序版本:4.0.31(最新)
• GPU 驱动程序版本:1.6.36.10 (256.00.35f11)

我尝试了 Nvidia 论坛上的许多解决方案，但没有成功。我不想每次发生这种情况都重新启动。我还尝试使用我认为正确(可能不正确)的程序卸载并重新加载驱动程序

kextunload -b com.nvidia.CUDA
kextload -b com.nvidia.CUDA

但是还是不行。如何让 GPU(或 CUDA)恢复正常？

这是设备查询结果

 CUDA Device Query (Runtime API) version (CUDART static linking)

Found 1 CUDA Capable device(s)

Device 0: "GeForce 9400M"
  CUDA Driver Version / Runtime Version          4.0 / 4.0
  CUDA Capability Major/Minor version number:    1.1
  Total amount of global memory:                 254 MBytes (265945088 bytes)
  ( 2) Multiprocessors x ( 8) CUDA Cores/MP:     16 CUDA Cores
  GPU Clock Speed:                               1.10 GHz
  Memory Clock rate:                             1075.00 Mhz
  Memory Bus Width:                              128-bit
  Max Texture Dimension Size (x,y,z)             1D=(8192), 2D=(65536,32768), 3D=(2048,2048,2048)
  Max Layered Texture Size (dim) x layers        1D=(8192) x 512, 2D=(8192,8192) x 512
  Total amount of constant memory:               65536 bytes
  Total amount of shared memory per block:       16384 bytes
  Total number of registers available per block: 8192
  Warp size:                                     32
  Maximum number of threads per block:           512
  Maximum sizes of each dimension of a block:    512 x 512 x 64
  Maximum sizes of each dimension of a grid:     65535 x 65535 x 1
  Maximum memory pitch:                          2147483647 bytes
  Texture alignment:                             256 bytes
  Concurrent copy and execution:                 No with 0 copy engine(s)
  Run time limit on kernels:                     Yes
  Integrated GPU sharing Host Memory:            Yes
  Support host page-locked memory mapping:       Yes
  Concurrent kernel execution:                   No
  Alignment requirement for Surfaces:            Yes
  Device has ECC support enabled:                No
  Device is using TCC driver mode:               No
  Device supports Unified Addressing (UVA):      No
  Device PCI Bus ID / PCI location ID:           2 / 0
  Compute Mode:
     < Default (multiple host threads can use ::cudaSetDevice() with device simultaneously) >

deviceQuery, CUDA Driver = CUDART, CUDA Driver Version = 4.0, CUDA Runtime Version = 4.0, NumDevs = 1, Device = GeForce 9400M
[deviceQuery] test results...
PASSED

这是一个可能会失败的代码示例(尽管在正常情况下不会失败)

#include <stdio.h>

__global__ void add(int a, int b, int *c) {
    *c = a + b;
}

int main(void) {
    int c;
    int *dev_c;

    cudaMalloc( (void **) &dev_c, sizeof(int)); // fails here, returning 46

    add<<<1,1>>>(2,7,dev_c);
    cudaMemcpy(&c, dev_c, sizeof(int), cudaMemcpyDeviceToHost);
    printf("hello world, %d\n",c);
    cudaFree( dev_c);
    return 0;
}

我还发现，有时我不需要重新启动就可以恢复正常的行为。我还是不知道是什么触发了它。

Answer 1

我确认评论者对我的帖子所做的声明。如果其他应用程序控制 GPU，则 GPU 可能无法工作。就我而言，Firefox 中的 Flash 播放器显然占用了卡上的所有可用资源。我关闭了 Firefox 的 flash 插件，卡立即又开始工作了。