simplification / speedup of GenerationMemoryStrategy

source/net/yacy/kelondro/util/GenerationMemoryStrategy.java

@@ -51,7 +51,7 @@ public class GenerationMemoryStrategy extends MemoryStrategy {
      */
     @Override
     protected final long free() {
-        return getUsage(eden, false).getCommitted() - getUsage(eden, false).getUsed();
+        return youngAvailable();
     }
     
     /**
@@ -61,7 +61,7 @@ public class GenerationMemoryStrategy extends MemoryStrategy {
      */
     @Override
     protected final long available() {
-    	return available(true);
+    	return available(false);
     }
     
     /**
@@ -70,7 +70,7 @@ public class GenerationMemoryStrategy extends MemoryStrategy {
      * @return bytes
      */
     private final long available(final boolean force) {
-    	return force & properState(force) ? Math.max(youngAvailable(), oldAvailable()) : Math.min(youngAvailable(), Math.max(M, oldAvailable()));
+    	return force & properState(force) ? Math.max(youngAvailable(), oldAvailable()) : oldAvailable();
     }
     
     /**
@@ -100,6 +100,14 @@ public class GenerationMemoryStrategy extends MemoryStrategy {
 		return heap.getHeapMemoryUsage().getMax();
     }
     
+    /**
+     * get the memory that needs to be available for properState
+     */
+    protected final long minMemory()
+    {
+    	return getUsage(eden, true).getUsed();
+    }
+
 	/**
      * checks if a specified amount of bytes are available
      * after the jvm recycled unused objects
@@ -151,7 +159,7 @@ public class GenerationMemoryStrategy extends MemoryStrategy {
      * @return if survivor fits into old space
      */
     private boolean properState(final boolean force) {
-    	final long surv = force? Math.max(M, getUsage(survivor, false).getUsed()) : getUsage(survivor, false).getCommitted();
+    	final long surv = force? M + getUsage(survivor, false).getUsed() : getUsage(survivor, false).getCommitted();
     	return surv < oldAvailable();
     }
     

source/net/yacy/kelondro/workflow/InstantBusyThread.java

@@ -162,7 +162,7 @@ public final class InstantBusyThread extends AbstractBusyThread implements BusyT
         thread.setIdleSleep(-1);
         thread.setBusySleep(-1);
         thread.setMemPreReqisite(0);
-        thread.setLoadPreReqisite(99); // this is called during initialization phase and some code parts depend on it; therefore we cannot set a prerequisite that prevents the start of that thread
+        thread.setLoadPreReqisite(Double.MAX_VALUE); // this is called during initialization phase and some code parts depend on it; therefore we cannot set a prerequisite that prevents the start of that thread
         thread.start();
         return thread;
     }