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#include <torch/csrc/distributed/c10d/DMAConnectivity.hpp>
#include <utility>
namespace {
std::string get_detector_key(
c10::DeviceType device_type,
const std::string& connection_type) {
std::ostringstream oss;
oss << device_type << "/" << connection_type;
return oss.str();
}
class DetectorMap {
public:
DetectorMap(const DetectorMap&) = delete;
DetectorMap& operator=(const DetectorMap&) = delete;
static DetectorMap& get() {
static DetectorMap instance;
return instance;
}
void register_detector(
c10::DeviceType device_type,
const std::string& connection_type,
c10::intrusive_ptr<c10d::DMAConnectivityDetector> detector) {
auto key = get_detector_key(device_type, connection_type);
detector_map_[key] = std::move(detector);
}
c10::intrusive_ptr<c10d::DMAConnectivity> detect(
c10::DeviceType device_type,
const std::string& connection_type) {
auto key = get_detector_key(device_type, connection_type);
{
auto it = cached_.find(key);
if (it != cached_.end()) {
return it->second;
}
}
auto it = detector_map_.find(key);
TORCH_CHECK(
it != detector_map_.end(),
"DMA connectivity detector for ",
device_type,
" over ",
connection_type,
" is not available");
auto detector = it->second;
auto connectivity = detector->detect();
cached_[key] = connectivity;
return connectivity;
}
private:
DetectorMap() = default;
std::unordered_map<
std::string,
c10::intrusive_ptr<c10d::DMAConnectivityDetector>>
detector_map_;
std::unordered_map<std::string, c10::intrusive_ptr<c10d::DMAConnectivity>>
cached_;
};
} // namespace
namespace c10d {
DMAConnectivity::DMAConnectivity(
c10::DeviceType device_type,
std::string connection_type,
std::vector<std::vector<int>> matrix)
: device_type(device_type),
connection_type(std::move(connection_type)),
matrix(std::move(matrix)) {}
void register_dma_connectivity_detector(
c10::DeviceType device_type,
const std::string& connection_type,
c10::intrusive_ptr<DMAConnectivityDetector> detector) {
return DetectorMap::get().register_detector(
device_type, connection_type, std::move(detector));
}
c10::intrusive_ptr<DMAConnectivity> detect_dma_connectivity(
c10::DeviceType device_type,
const std::string& connection_type) {
return DetectorMap::get().detect(device_type, connection_type);
}
} // namespace c10d
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