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CUDA: Changing the CUDA scheduling strategy to spin #16585

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Merged
merged 5 commits into from
Oct 15, 2025
Merged

CUDA: Changing the CUDA scheduling strategy to spin #16585

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02fc26c
CUDA set scheduling strategy to spinning for cc121
JTischbein Oct 15, 2025
a33e305
Using prop.major and prop.minor, include HIP and MUSA
JTischbein Oct 15, 2025
4a707ec
Exclude HIP and MUSA
JTischbein Oct 15, 2025
f7ada07
Remove trailing whitespace
JTischbein Oct 15, 2025
14652af
Remove empty line
JTischbein Oct 15, 2025
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9 changes: 9 additions & 0 deletions ggml/src/ggml-cuda/ggml-cuda.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -273,6 +273,15 @@ static ggml_cuda_device_info ggml_cuda_init() {
} else if (device_name.substr(0, 21) == "NVIDIA GeForce GTX 16") {
turing_devices_without_mma.push_back({ id, device_name });
}

// Temporary performance fix:
// Setting device scheduling strategy for iGPUs with cc121 to "spinning" to avoid delays in cuda synchronize calls.
// 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(cudaSetDeviceFlags(cudaDeviceScheduleSpin));
}

#endif // defined(GGML_USE_HIP)
}

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