set the test checkpointing peroid to be 2
diff --git a/pregelix/pregelix-api/src/main/java/edu/uci/ics/pregelix/api/util/ConservativeCheckpointHook.java b/pregelix/pregelix-api/src/main/java/edu/uci/ics/pregelix/api/util/ConservativeCheckpointHook.java
index 3455233..4f5fef0 100644
--- a/pregelix/pregelix-api/src/main/java/edu/uci/ics/pregelix/api/util/ConservativeCheckpointHook.java
+++ b/pregelix/pregelix-api/src/main/java/edu/uci/ics/pregelix/api/util/ConservativeCheckpointHook.java
@@ -25,7 +25,7 @@
 
     @Override
     public boolean checkpoint(int superstep) {
-        if (superstep % 100 == 0) {
+        if (superstep % 2 == 0) {
             return true;
         } else {
             return false;