update interval can be disabled by setting it to 0

src/main/java/de/nqueensfaf/Config.java

@@ -28,8 +28,8 @@ public Config() {
     }
 
     public void validate() {
-	if (updateInterval <= 0)
-	    throw new IllegalArgumentException("invalid value for updateInterval: only numbers >0 are allowed");
+	if (updateInterval < 0)
+	    throw new IllegalArgumentException("invalid value for updateInterval: only numbers >0 or 0 (no updates) are allowed");
 
 	if (autoSaveEnabled) {
 	    if (autoSavePercentageStep <= 0 || autoSavePercentageStep >= 100)

src/main/java/de/nqueensfaf/Solver.java

@@ -54,7 +54,7 @@ public final <T extends Solver> T solve() {
 	    initCb.accept(this);
 
 	state = RUNNING;
-	if (onUpdateConsumer != null)
+	if (onUpdateConsumer != null && getConfig().updateInterval > 0) // if updateInterval is 0, it means, disable progress updates
 	    executor.submit(consumeUpdates());
 	if (getConfig().autoSaveEnabled)
 	    executor.submit(autoSaver());

src/main/java/de/nqueensfaf/cli/CLI.java

@@ -162,7 +162,8 @@ public void run() {
 			System.out.format(progressStringFormat, loadingChars[loadingCharIdx++], progress, solutions,
 				getDurationPrettyString(duration));
 		    }).onFinish(self -> {
-			System.out.println();
+			if(self.getConfig().updateInterval > 0)
+			    System.out.println();
 			System.out.println("found " + self.getSolutions() + " solutions in "
 				+ getDurationPrettyString(self.getDuration()));
 		    });