Adjust tests LocalDistributedExecutor for low memory settings on build servers.

stratosphere-clients/src/main/java/eu/stratosphere/client/localDistributed/LocalDistributedExecutor.java

@@ -68,6 +68,16 @@ public class LocalDistributedExecutor extends PlanExecutor {
 
 		// we need to down size the memory. determine the memory and divide it by the number of task managers
 		long javaMem = HardwareDescriptionFactory.extractFromSystem().getSizeOfFreeMemory();
+		
+		// at this time, we need to scale down the memory, because we cannot dedicate all free memory to the 
+		// memory manager. we have to account for the buffer pools as well, and the job manager#s data structures
+		long bufferMem = GlobalConfiguration.getLong(ConfigConstants.TASK_MANAGER_NETWORK_NUM_BUFFERS_KEY,
+			ConfigConstants.DEFAULT_TASK_MANAGER_NETWORK_NUM_BUFFERS) * 
+			GlobalConfiguration.getLong(ConfigConstants.TASK_MANAGER_NETWORK_BUFFER_SIZE_KEY,
+				ConfigConstants.DEFAULT_TASK_MANAGER_NETWORK_BUFFER_SIZE);
+		
+		javaMem = (long) (0.8 * (javaMem - bufferMem));
+		
 		javaMem /= numTaskMgr;
 		
 		// convert memory from bytes to megabytes

stratosphere-tests/src/main/java/eu/stratosphere/test/util/AbstractTestBase.java

@@ -48,7 +48,7 @@ public abstract class AbstractTestBase {
 	
 	private static final int MINIMUM_HEAP_SIZE_MB = 192;
 	
-	private static final long TASK_MANAGER_MEMORY_SIZE = 96;
+	private static final long TASK_MANAGER_MEMORY_SIZE = 80;
 
 	
 	protected final Configuration config;