Add 'usenormalthreadpriority' setting (makes renders on Windows use normal priority)

src/main/java/org/dynmap/AsynchronousQueue.java

@@ -17,14 +17,16 @@ public class AsynchronousQueue<T> {
     private int accelDequeueThresh;
     private int pendingcnt;
     private int pendinglimit;
+    private boolean normalprio;
     
-    public AsynchronousQueue(Handler<T> handler, int dequeueTime, int accelDequeueThresh, int accelDequeueTime, int pendinglimit) {
+    public AsynchronousQueue(Handler<T> handler, int dequeueTime, int accelDequeueThresh, int accelDequeueTime, int pendinglimit, boolean normalprio) {
         this.handler = handler;
         this.dequeueTime = dequeueTime;
         this.accelDequeueTime = accelDequeueTime;
         this.accelDequeueThresh = accelDequeueThresh;
         if(pendinglimit < 1) pendinglimit = 1;
         this.pendinglimit = pendinglimit;
+        this.normalprio = normalprio;
     }
 
     public boolean push(T t) {
@@ -83,7 +85,8 @@ public class AsynchronousQueue<T> {
             });
             thread.start();
             try {
-                thread.setPriority(Thread.MIN_PRIORITY);
+                if(!normalprio)
+                    thread.setPriority(Thread.MIN_PRIORITY);
             } catch (SecurityException e) {
                 Log.info("Failed to set minimum priority for worker thread!");
             }

src/main/java/org/dynmap/MapManager.java

@@ -50,6 +50,7 @@ public class MapManager {
     private int progressinterval = 100;
     private boolean saverestorepending = true;
     private boolean hideores = false;
+    private boolean usenormalpriority = false;
     
     private boolean pauseupdaterenders = false;
     private boolean pausefullrenders = false;
@@ -117,7 +118,8 @@ public class MapManager {
         public Thread newThread(Runnable r) {
             Thread t = new Thread(r);
             t.setDaemon(true);
-            t.setPriority(Thread.MIN_PRIORITY);
+            if(!mapman.usenormalpriority)
+                t.setPriority(Thread.MIN_PRIORITY);
             t.setName("Dynmap Render Thread");
             return t;
         }
@@ -658,6 +660,9 @@ public class MapManager {
         /* Get block hiding data, if any */
         hideores = configuration.getBoolean("hideores", false);
 
+        /* See what priority to use */
+        usenormalpriority = configuration.getBoolean("usenormalthreadpriority", false);
+        
         /* Clear color scheme */
         ColorScheme.reset();
         
@@ -684,7 +689,8 @@ public class MapManager {
             (int) (configuration.getDouble("renderinterval", 0.5) * 1000),
             configuration.getInteger("renderacceleratethreshold", 30),
             (int)(configuration.getDouble("renderaccelerateinterval", 0.2) * 1000), 
-            configuration.getInteger("tiles-rendered-at-once", (Runtime.getRuntime().availableProcessors()+1)/2));
+            configuration.getInteger("tiles-rendered-at-once", (Runtime.getRuntime().availableProcessors()+1)/2),
+            usenormalpriority);
 
         /* On dedicated thread, so default to no delays */
         timeslice_int = (long)(configuration.getDouble("timesliceinterval", 0.0) * 1000);

src/main/resources/configuration.txt

@@ -133,6 +133,11 @@ renderaccelerateinterval: 0.2
 # How many update tiles to work on at once (if not defined, default is 1/2 the number of cores)
 tiles-rendered-at-once: 2
 
+# If true, use normal priority threads for rendering (versus low priority) - this can keep rendering
+# from starving on busy Windows boxes (Linux JVMs pretty much ignore thread priority), but may result
+# in more competition for CPU resources with other processes
+usenormalthreadpriority: true
+
 # Save and restore pending tile renders - prevents their loss on server shutdown or /reload
 saverestorepending: true