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#ifndef SCHEDULING_MPI_WORKER_SCHEDULER_H_
#define SCHEDULING_MPI_WORKER_SCHEDULER_H_
#include <condition_variable>
#include <mutex>
#include <set>
#include "griddingtaskmanager.h"
#include "threadedscheduler.h"
#include "../main/settings.h"
#include "griddingresult.h"
namespace wsclean {
class MpiWorkerScheduler final : public GriddingTaskManager {
public:
MpiWorkerScheduler(const class Settings& settings);
~MpiWorkerScheduler() override { Finish(); }
int Rank() const { return rank_; }
void Start(size_t n_writer_groups) override {
GriddingTaskManager::Start(n_writer_groups);
local_scheduler_.Start(n_writer_groups);
}
/**
* Run function for use in Worker.
* Runs the task using the local scheduler.
* Note: MpiWorkerScheduler ignores the callback function.
*/
void Run(GriddingTask&& task,
std::function<void(GriddingResult&)> ignored_callback) override;
std::unique_ptr<WriterLock> GetLock(size_t writer_group_index) override {
// Since WSClean uses a static outputchannel-to-node mapping,
// synchronisation of writes only needs to happen within a node.
return local_scheduler_.GetLock(writer_group_index);
}
void GrantLock(size_t writer_group_index);
private:
/** MPI rank / node index. */
int rank_;
/** Serializes MPI_Send calls from different threads. */
std::mutex mutex_;
/**
* The lower-level local scheduler on an MPI node.
* Always use a ThreadedScheduler since acquiring writer locks in the gridder
* should use a different thread than Worker::Run().
*/
ThreadedScheduler local_scheduler_;
};
} // namespace wsclean
#endif // SCHEDULING_MPI_WORKER_SCHEDULER_H_
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