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#pragma once
#include <torch/csrc/distributed/c10d/Backend.hpp>
namespace c10d {
class FakeWork : public Work {
public:
bool wait(std::chrono::milliseconds timeout) override {
return true;
}
c10::intrusive_ptr<c10::ivalue::Future> getFuture() override {
auto fut = c10::make_intrusive<c10::ivalue::Future>(c10::NoneType::get());
fut->markCompleted();
return fut;
}
};
class FakeProcessGroup : public Backend {
public:
FakeProcessGroup(int rank, int size) : Backend(rank, size) {}
c10::intrusive_ptr<Work> broadcast(
std::vector<at::Tensor>& /* tensors */,
const BroadcastOptions& /* opts */ = BroadcastOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> allreduce(
std::vector<at::Tensor>& /* tensors */,
const AllreduceOptions& /* opts */ = AllreduceOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> allreduce_sparse(
std::vector<at::Tensor>& /* tensors */,
const AllreduceOptions& /* opts */ = AllreduceOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> allreduce_coalesced(
std::vector<at::Tensor>& /* tensors */,
const AllreduceCoalescedOptions& /* opts */ =
AllreduceCoalescedOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> reduce(
std::vector<at::Tensor>& /* tensors */,
const ReduceOptions& /* opts */ = ReduceOptions()) override {
return c10::make_intrusive<FakeWork>();
}
// NOTE [allgather on FakeProcessGroup]
// Assume each rank have the same input tensor so we just copy to the results
// since it's not a real allgather, we simply make this copying logic to let
// some simple validation works (i.e. calling allgather to see if each rank
// have the same tensor or not).
//
// NOTE: in general it's not good form to try to make FakeProcessGroup work
// with real data, but the reasoning here is that we want FakeProcessGroup to
// work with DeviceMesh's init code that have the data validation, which
// makes it worth the tradeoff.
c10::intrusive_ptr<Work> allgather(
std::vector<std::vector<at::Tensor>>& outputTensors,
std::vector<at::Tensor>& inputTensors,
const AllgatherOptions& /* opts */ = AllgatherOptions()) override {
for (auto& tensor : outputTensors[0]) {
tensor.copy_(inputTensors[0]);
}
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> _allgather_base(
at::Tensor& outputBuffer,
at::Tensor& inputBuffer,
const AllgatherOptions& /* opts */ = AllgatherOptions()) override {
auto chunks = outputBuffer.chunk(size_);
for (auto& tensor : chunks) {
tensor.copy_(inputBuffer);
}
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> allgather_coalesced(
std::vector<std::vector<at::Tensor>>& /* outputTensorLists */,
std::vector<at::Tensor>& /* inputTensors */,
const AllgatherOptions& /* opts */ = AllgatherOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> allgather_into_tensor_coalesced(
std::vector<at::Tensor>& outputs,
std::vector<at::Tensor>& inputs,
const AllgatherOptions& /* opts */ = AllgatherOptions()) override {
for (size_t i = 0; i < outputs.size(); ++i) {
auto chunks = outputs[i].chunk(size_);
for (auto& chunk : chunks) {
chunk.copy_(inputs[i]);
}
}
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> gather(
std::vector<std::vector<at::Tensor>>& /* outputTensors */,
std::vector<at::Tensor>& /* inputTensors */,
const GatherOptions& /* opts */ = GatherOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> scatter(
std::vector<at::Tensor>& /* outputTensors */,
std::vector<std::vector<at::Tensor>>& /* inputTensors */,
const ScatterOptions& /* opts */ = ScatterOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> reduce_scatter(
std::vector<at::Tensor>& /* outputTensors */,
std::vector<std::vector<at::Tensor>>& /* inputTensors */,
const ReduceScatterOptions& /* opts */ =
ReduceScatterOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> _reduce_scatter_base(
at::Tensor& /* outputBuffer */,
at::Tensor& /* inputBuffer */,
const ReduceScatterOptions& /* opts */ =
ReduceScatterOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> reduce_scatter_tensor_coalesced(
std::vector<at::Tensor>& /* outputs */,
std::vector<at::Tensor>& /* inputs */,
const ReduceScatterOptions& /* opts */ =
ReduceScatterOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> alltoall_base(
at::Tensor& /* outputBuffer */,
at::Tensor& /* inputBuffer */,
std::vector<int64_t>& /* outputSplitSizes */,
std::vector<int64_t>& /* inputSplitSizes */,
const AllToAllOptions& /* opts */ = AllToAllOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> alltoall(
std::vector<at::Tensor>& /* outputTensors */,
std::vector<at::Tensor>& /* inputTensors */,
const AllToAllOptions& opts = AllToAllOptions()) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> send(
std::vector<at::Tensor>& /* tensors */,
int /* dstRank */,
int /* tag */) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> recv(
std::vector<at::Tensor>& /* tensors */,
int /* srcRank */,
int /* tag */) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> recvAnysource(
std::vector<at::Tensor>& /* tensors */,
int /* tag */) override {
return c10::make_intrusive<FakeWork>();
}
c10::intrusive_ptr<Work> barrier(
const BarrierOptions& /* opts */ = BarrierOptions()) override {
return c10::make_intrusive<FakeWork>();
}
};
} // namespace c10d
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