// currently, this method checks if there if a file already exists, and if so, assumes it is valid.
// ideally, a check should be made to ensure the saved SSD state matches with the state of the current global parameters
void Experiment::calibrate_and_save(Workload_Definition* workload, string name, int num_IOs, bool force) {
//string file_name = base_folder + "calibrated_state.txt";
string file_name = base_folder + name;
std::ifstream ifile(file_name.c_str());
if (ifile && !force) {
return; // file exists
}
StatisticsGatherer::set_record_statistics(false);
//StatisticsGatherer::get_global_instance()->init();
Thread::set_record_internal_statistics(false);
VisualTracer::init();
//Free_Space_Meter::init();
//Free_Space_Per_LUN_Meter::init();
printf("Creating calibrated SSD state.\n");
OperatingSystem* os = new OperatingSystem();
os->set_num_writes_to_stop_after(num_IOs);
vector<Thread*> init_threads = workload->generate_instance();
os->set_threads(init_threads);
os->set_progress_meter_granularity(1000);
os->run();
os->get_ssd()->execute_all_remaining_events();
save_state(os, file_name);
//StatisticsGatherer::get_global_instance()->print();
//Free_Space_Meter::print();
//Free_Space_Per_LUN_Meter::print();
delete os;
}
OperatingSystem* Experiment::load_state(string name) {
string file_name = base_folder + name;
printf("loading calibration file: %s\n", file_name.c_str());
std::ifstream file(file_name.c_str());
boost::archive::text_iarchive ia(file);
ia.register_type<FtlImpl_Page>( );
ia.register_type<Block_manager_parallel>();
ia.register_type<Sequential_Locality_BM>( );
ia.register_type<File_Manager>( );
ia.register_type<Simple_Thread>( );
ia.register_type<Random_IO_Pattern>( );
ia.register_type<Sequential_IO_Pattern>( );
ia.register_type<WRITES>( );
ia.register_type<TRIMS>( );
ia.register_type<READS>( );
ia.register_type<READS_OR_WRITES>();
ia.register_type<Asynchronous_Random_Writer>();
ia.register_type<Asynchronous_Random_Reader>();
ia.register_type<MTRand>();
ia.register_type<MTRand_closed>();
ia.register_type<MTRand_open>();
ia.register_type<MTRand53>();
OperatingSystem* os;
ia >> os;
vector<Thread*> threads;
ia >> threads;
Individual_Threads_Statistics::init();
for (auto t : threads) {
//Individual_Threads_Statistics::register_thread(t, "");
}
os->set_threads(threads);
//os->init_threads();
IOScheduler* scheduler = os->get_ssd()->get_scheduler();
scheduler->init();
Block_manager_parent* bm = Block_manager_parent::get_new_instance();
bm->copy_state(scheduler->get_bm());
delete scheduler->get_bm();
scheduler->set_block_manager(bm);
Migrator* m = scheduler->get_migrator();
m->set_block_manager(bm);
Garbage_Collector* gc = m->get_garbage_collector();
gc->set_block_manager(bm);
return os;
}