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#include <torch/extension.h>
#include <ATen/native/mps/OperationUtils.h>
// this sample custom kernel is taken from:
// https://developer.apple.com/documentation/metal/performing_calculations_on_a_gpu
static at::native::mps::MetalShaderLibrary lib(R"MPS_ADD_ARRAYS(
#include <metal_stdlib>
using namespace metal;
kernel void add_arrays(device const float* inA,
device const float* inB,
device float* result,
uint index [[thread_position_in_grid]])
{
result[index] = inA[index] + inB[index];
}
)MPS_ADD_ARRAYS");
at::Tensor get_cpu_add_output(at::Tensor & cpu_input1, at::Tensor & cpu_input2) {
return cpu_input1 + cpu_input2;
}
at::Tensor get_mps_add_output(at::Tensor & mps_input1, at::Tensor & mps_input2) {
// smoke tests
TORCH_CHECK(mps_input1.is_mps());
TORCH_CHECK(mps_input2.is_mps());
TORCH_CHECK(mps_input1.sizes() == mps_input2.sizes());
using namespace at::native::mps;
at::Tensor mps_output = at::empty_like(mps_input1);
@autoreleasepool {
size_t numThreads = mps_output.numel();
auto kernelPSO = lib.getPipelineStateForFunc("add_arrays");
MPSStream* mpsStream = getCurrentMPSStream();
dispatch_sync(mpsStream->queue(), ^() {
// Start a compute pass.
id<MTLComputeCommandEncoder> computeEncoder = mpsStream->commandEncoder();
TORCH_CHECK(computeEncoder, "Failed to create compute command encoder");
// Encode the pipeline state object and its parameters.
[computeEncoder setComputePipelineState: kernelPSO];
mtl_setBuffer(computeEncoder, mps_input1, 0);
mtl_setBuffer(computeEncoder, mps_input2, 1);
mtl_setBuffer(computeEncoder, mps_output, 2);
mtl_dispatch1DJob(computeEncoder, kernelPSO, numThreads);
});
}
return mps_output;
}
PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {
m.def("get_cpu_add_output", &get_cpu_add_output);
m.def("get_mps_add_output", &get_mps_add_output);
}
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