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/**
* Copyright 2023, XGBoost contributors
*/
#include "federated_coll.h"
#include <federated.grpc.pb.h>
#include <federated.pb.h>
#include <algorithm> // for copy_n
#include "../../src/collective/allgather.h"
#include "../../src/common/common.h" // for AssertGPUSupport
#include "federated_comm.h" // for FederatedComm
#include "xgboost/collective/result.h" // for Result
namespace xgboost::collective {
namespace {
[[nodiscard]] Result GetGRPCResult(std::string const &name, grpc::Status const &status) {
return Fail(name + " RPC failed. " + std::to_string(status.error_code()) + ": " +
status.error_message());
}
[[nodiscard]] Result BroadcastImpl(Comm const &comm, std::uint64_t *sequence_number,
common::Span<std::int8_t> data, std::int32_t root) {
using namespace federated; // NOLINT
auto fed = dynamic_cast<FederatedComm const *>(&comm);
CHECK(fed);
auto stub = fed->Handle();
BroadcastRequest request;
request.set_sequence_number((*sequence_number)++);
request.set_rank(comm.Rank());
if (comm.Rank() != root) {
request.set_send_buffer(nullptr, 0);
} else {
request.set_send_buffer(data.data(), data.size());
}
request.set_root(root);
BroadcastReply reply;
grpc::ClientContext context;
context.set_wait_for_ready(true);
grpc::Status status = stub->Broadcast(&context, request, &reply);
if (!status.ok()) {
return GetGRPCResult("Broadcast", status);
}
if (comm.Rank() != root) {
auto const &r = reply.receive_buffer();
std::copy_n(r.cbegin(), r.size(), data.data());
}
return Success();
}
} // namespace
#if !defined(XGBOOST_USE_CUDA)
Coll *FederatedColl::MakeCUDAVar() {
common::AssertGPUSupport();
return nullptr;
}
#endif
[[nodiscard]] Result FederatedColl::Allreduce(Comm const &comm, common::Span<std::int8_t> data,
ArrayInterfaceHandler::Type type, Op op) {
using namespace federated; // NOLINT
auto fed = dynamic_cast<FederatedComm const *>(&comm);
CHECK(fed);
auto stub = fed->Handle();
AllreduceRequest request;
request.set_sequence_number(sequence_number_++);
request.set_rank(comm.Rank());
request.set_send_buffer(data.data(), data.size());
request.set_data_type(static_cast<::xgboost::collective::federated::DataType>(type));
request.set_reduce_operation(static_cast<::xgboost::collective::federated::ReduceOperation>(op));
AllreduceReply reply;
grpc::ClientContext context;
context.set_wait_for_ready(true);
grpc::Status status = stub->Allreduce(&context, request, &reply);
if (!status.ok()) {
return GetGRPCResult("Allreduce", status);
}
auto const &r = reply.receive_buffer();
std::copy_n(r.cbegin(), r.size(), data.data());
return Success();
}
[[nodiscard]] Result FederatedColl::Broadcast(Comm const &comm, common::Span<std::int8_t> data,
std::int32_t root) {
return BroadcastImpl(comm, &this->sequence_number_, data, root);
}
[[nodiscard]] Result FederatedColl::Allgather(Comm const &comm, common::Span<std::int8_t> data) {
using namespace federated; // NOLINT
auto fed = dynamic_cast<FederatedComm const *>(&comm);
CHECK(fed);
auto stub = fed->Handle();
auto size = data.size_bytes() / comm.World();
auto offset = comm.Rank() * size;
auto segment = data.subspan(offset, size);
AllgatherRequest request;
request.set_sequence_number(sequence_number_++);
request.set_rank(comm.Rank());
request.set_send_buffer(segment.data(), segment.size());
AllgatherReply reply;
grpc::ClientContext context;
context.set_wait_for_ready(true);
grpc::Status status = stub->Allgather(&context, request, &reply);
if (!status.ok()) {
return GetGRPCResult("Allgather", status);
}
auto const &r = reply.receive_buffer();
std::copy_n(r.cbegin(), r.size(), data.begin());
return Success();
}
[[nodiscard]] Result FederatedColl::AllgatherV(Comm const &comm,
common::Span<std::int8_t const> data,
common::Span<std::int64_t const>,
common::Span<std::int64_t>,
common::Span<std::int8_t> recv, AllgatherVAlgo) {
using namespace federated; // NOLINT
auto fed = dynamic_cast<FederatedComm const *>(&comm);
CHECK(fed);
auto stub = fed->Handle();
AllgatherVRequest request;
request.set_sequence_number(sequence_number_++);
request.set_rank(comm.Rank());
request.set_send_buffer(data.data(), data.size());
AllgatherVReply reply;
grpc::ClientContext context;
context.set_wait_for_ready(true);
grpc::Status status = stub->AllgatherV(&context, request, &reply);
if (!status.ok()) {
return GetGRPCResult("AllgatherV", status);
}
std::string const &r = reply.receive_buffer();
CHECK_EQ(r.size(), recv.size());
std::copy_n(r.cbegin(), r.size(), recv.begin());
return Success();
}
} // namespace xgboost::collective
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