Dynamically determine thread count for dataset init

src/miner.cpp

@@ -1201,14 +1201,27 @@ void static RandomXMiner()
                 rxdebug("%s: initialized cache with keyHeight=%d, randomxBlockKey=%s\n", keyHeight, randomxBlockKey.ToString().c_str());
             }
 
-            //TODO: this is hardcoded to use 2 threads instead of the number of mining threads
-            rxdebug("%s: initializing dataset with 2 threads\n");
-            std::thread t1(&randomx_init_dataset, randomxDataset, randomxCache, 0, datasetItemCount / 2);
-            std::thread t2(&randomx_init_dataset, randomxDataset, randomxCache, datasetItemCount / 2, datasetItemCount - datasetItemCount / 2);
-            t1.join();
-            t2.join();
-
-            // randomx_init_dataset(randomxDataset, randomxCache, 0, datasetItemCount);
+            int initThreadCount = std::thread::hardware_concurrency();
+            if(initThreadCount > 1) {
+                rxdebug("%s: initializing dataset with %d threads\n", initThreadCount);
+                std::vector<std::thread> threads;
+                uint32_t startItem = 0;
+                auto perThread = datasetItemCount / initThreadCount;
+                auto remainder = datasetItemCount % initThreadCount;
+                for (int i = 0; i < initThreadCount; ++i) {
+                    auto count = perThread + (i == initThreadCount - 1 ? remainder : 0);
+                    threads.push_back(std::thread(&randomx_init_dataset, randomxDataset, randomxCache, startItem, count));
+                    startItem += count;
+                }
+                for (unsigned i = 0; i < threads.size(); ++i) {
+                    threads[i].join();
+                }
+                threads.clear();
+            } else {
+                rxdebug("%s: initializing dataset with 1 thread\n");
+                randomx_init_dataset(randomxDataset, randomxCache, 0, datasetItemCount);
+            }
+
             rxdebug("%s: dataset initialized\n");
 
             myVM = randomx_create_vm(flags, nullptr, randomxDataset);
@@ -1463,8 +1476,8 @@ void static RandomXMiner()
 
    randomx_release_dataset(randomxDataset);
    rxdebug("%s: released dataset in normal exit\n");
-   randomx_release_cache(randomxCache);
-   rxdebug("%s: released cache in normal exit\n");
+   //randomx_release_cache(randomxCache);
+   //rxdebug("%s: released cache in normal exit\n");
    miningTimer.stop();
    c.disconnect();
 }