cryptonight concurrency init

Author: Oliver Weichhold

src/Miningcore/Program.cs

@@ -781,7 +781,7 @@ private static async Task PreFlightChecks(IServiceProvider services)
 
         // Configure Cryptonight
         Cryptonight.messageBus = messageBus;
-        Cryptonight.InitContexts(clusterConfig.CryptonightMaxThreads ?? 1);
+        Cryptonight.InitContexts(GetDefaultConcurrency(clusterConfig.CryptonightMaxThreads));
 
         // Configure RandomX
         RandomX.messageBus = messageBus;
@@ -979,6 +979,18 @@ private static void ConfigureIpRateLimitOptions(IpRateLimitOptions options)
         logger.Info(() => $"API access limited to {(string.Join(", ", rules.Select(x => $"{x.Limit} requests per {x.Period}")))}, except from {string.Join(", ", options.IpWhitelist)}");
     }
 
+    private static int GetDefaultConcurrency(int? value)
+    {
+        value = value switch
+        {
+            null => 1,
+            -1 => Environment.ProcessorCount,
+            _ => value
+        };
+
+        return value.Value;
+    }
+
     private static void OnAppDomainUnhandledException(object sender, UnhandledExceptionEventArgs e)
     {
         if(logger != null)