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ggml: avoid creating CUDA context during device init #20595

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Merged
am17an merged 1 commit into from
Mar 15, 2026
Merged

ggml: avoid creating CUDA context during device init #20595

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18 changes: 7 additions & 11 deletions ggml/src/ggml-cuda/ggml-cuda.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -251,11 +251,6 @@ static ggml_cuda_device_info ggml_cuda_init() {
info.devices[id].supports_cooperative_launch = false;
#endif // !(GGML_USE_MUSA)

// cudaMemGetInfo returns info for the current device
size_t free_mem;
CUDA_CHECK(cudaSetDevice(id));
CUDA_CHECK(cudaMemGetInfo(&free_mem, NULL));

#if defined(GGML_USE_HIP)
info.devices[id].smpbo = prop.sharedMemPerBlock;

Expand All @@ -270,25 +265,25 @@ static ggml_cuda_device_info ggml_cuda_init() {
info.devices[id].cc += prop.minor * 0x10;
}
}
GGML_LOG_INFO(" Device %d: %s, %s (0x%x), VMM: %s, Wave Size: %d, VRAM: %zu MiB (%zu MiB free)\n",
GGML_LOG_INFO(" Device %d: %s, %s (0x%x), VMM: %s, Wave Size: %d, VRAM: %zu MiB\n",
id, prop.name, prop.gcnArchName, info.devices[id].cc & 0xffff,
device_vmm ? "yes" : "no", prop.warpSize,
(size_t)(prop.totalGlobalMem / (1024 * 1024)), free_mem / (1024 * 1024));
(size_t)(prop.totalGlobalMem / (1024 * 1024)));
#elif defined(GGML_USE_MUSA)
// FIXME: Ensure compatibility with varying warp sizes across different MUSA archs.
info.devices[id].warp_size = 32;
info.devices[id].smpbo = prop.sharedMemPerBlockOptin;
info.devices[id].cc = GGML_CUDA_CC_OFFSET_MTHREADS + prop.major * 0x100;
info.devices[id].cc += prop.minor * 0x10;
GGML_LOG_INFO(" Device %d: %s, compute capability %d.%d, VMM: %s, VRAM: %zu MiB (%zu MiB free)\n",
GGML_LOG_INFO(" Device %d: %s, compute capability %d.%d, VMM: %s, VRAM: %zu MiB\n",
id, prop.name, prop.major, prop.minor, device_vmm ? "yes" : "no",
(size_t)(prop.totalGlobalMem / (1024 * 1024)), free_mem / (1024 * 1024));
(size_t)(prop.totalGlobalMem / (1024 * 1024)));
#else
info.devices[id].smpbo = prop.sharedMemPerBlockOptin;
info.devices[id].cc = 100*prop.major + 10*prop.minor;
GGML_LOG_INFO(" Device %d: %s, compute capability %d.%d, VMM: %s, VRAM: %zu MiB (%zu MiB free)\n",
GGML_LOG_INFO(" Device %d: %s, compute capability %d.%d, VMM: %s, VRAM: %zu MiB\n",
id, prop.name, prop.major, prop.minor, device_vmm ? "yes" : "no",
(size_t)(prop.totalGlobalMem / (1024 * 1024)), free_mem / (1024 * 1024));
(size_t)(prop.totalGlobalMem / (1024 * 1024)));
std::string device_name(prop.name);
if (device_name == "NVIDIA GeForce MX450") {
turing_devices_without_mma.push_back({ id, device_name });
Expand All @@ -303,6 +298,7 @@ static ggml_cuda_device_info ggml_cuda_init() {
// TODO: Check for future drivers the default scheduling strategy and
// remove this call again when cudaDeviceScheduleSpin is default.
if (prop.major == 12 && prop.minor == 1) {
CUDA_CHECK(cudaSetDevice(id));
CUDA_CHECK(cudaSetDeviceFlags(cudaDeviceScheduleSpin));
}

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