diff --git a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/client/Client.java b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/client/Client.java
index 936042e..9b80f8c 100644
--- a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/client/Client.java
+++ b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/client/Client.java
@@ -39,7 +39,7 @@
         public int sizeKmer;
         
         @Option(name = "-num-iteration", usage = "max number of iterations, for pagerank job only", required = false)
-        public long numIteration = -1;
+        public int numIteration = -1;
 
         @Option(name = "-runtime-profiling", usage = "whether to do runtime profifling", required = false)
         public String profiling = "false";
@@ -65,9 +65,9 @@
         job.getConfiguration().setInt(TwoStepLogAlgorithmForPathMergeVertex.KMER_SIZE, options.sizeKmer);
         job.getConfiguration().setInt(ThreeStepLogAlgorithmForPathMergeVertex.KMER_SIZE, options.sizeKmer);
         if (options.numIteration > 0){
-            job.getConfiguration().setLong(NaiveAlgorithmForPathMergeVertex.ITERATIONS, options.numIteration);
-            job.getConfiguration().setLong(TwoStepLogAlgorithmForPathMergeVertex.ITERATIONS, options.numIteration);
-            job.getConfiguration().setLong(ThreeStepLogAlgorithmForPathMergeVertex.ITERATIONS, options.numIteration);
+            job.getConfiguration().setInt(NaiveAlgorithmForPathMergeVertex.ITERATIONS, options.numIteration);
+            job.getConfiguration().setInt(TwoStepLogAlgorithmForPathMergeVertex.ITERATIONS, options.numIteration);
+            job.getConfiguration().setInt(ThreeStepLogAlgorithmForPathMergeVertex.ITERATIONS, options.numIteration);
         }
         return options;
     }
diff --git a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/ThreeStepLogAlgorithmForPathMergeVertex.java b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/ThreeStepLogAlgorithmForPathMergeVertex.java
index 4872829..1a1ef8a 100644
--- a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/ThreeStepLogAlgorithmForPathMergeVertex.java
+++ b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/ThreeStepLogAlgorithmForPathMergeVertex.java
@@ -67,7 +67,7 @@
 		if(kmerSize == -1)
 			kmerSize = getContext().getConfiguration().getInt(KMER_SIZE, 5);
         if (maxIteration < 0) 
-            maxIteration = getContext().getConfiguration().getInt(ITERATIONS, 100);
+            maxIteration = getContext().getConfiguration().getInt(ITERATIONS, 20);
 	}
 	/**
 	 * get destination vertex
@@ -337,6 +337,8 @@
 				mergeChainVertex(msgIterator);
 			}
 		}
+		else
+			voteToHalt();
 	}
 	/**
 	 * @param args
diff --git a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/TwoStepLogAlgorithmForPathMergeVertex.java b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/TwoStepLogAlgorithmForPathMergeVertex.java
index fc0b7aa..526a57c 100644
--- a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/TwoStepLogAlgorithmForPathMergeVertex.java
+++ b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/TwoStepLogAlgorithmForPathMergeVertex.java
@@ -67,7 +67,7 @@
 		if(kmerSize == -1)
 			kmerSize = getContext().getConfiguration().getInt(KMER_SIZE, 5);
         if (maxIteration < 0) 
-            maxIteration = getContext().getConfiguration().getInt(ITERATIONS, 100);
+            maxIteration = getContext().getConfiguration().getInt(ITERATIONS, 20);
 	}
 	/**
 	 * get destination vertex
@@ -272,9 +272,6 @@
 	 * head send message to path
 	 */
 	public void sendMsgToPathVertex(Iterator<LogAlgorithmMessageWritable> msgIterator){
-		if(getSuperstep() == 11){
-			System.out.print("hre");
-		}
 		if(getSuperstep() == 3){
 			msg.reset();
 			sendMsgToPathVertex(getVertexId(), getVertexValue().getAdjMap());
@@ -328,6 +325,8 @@
 		else if(getSuperstep()%2 == 0 && getSuperstep() <= maxIteration){
 			responseMsgToHeadVertex(msgIterator);
 		}
+		else
+			voteToHalt();
 	}
 	/**
 	 * @param args