output average time between updates in the update stream

Author: agubichev

src/main/java/ldbc/socialnet/dbgen/generator/MRGenerateUsers.java

@@ -125,7 +125,7 @@ public void reduce(LongWritable key, Iterable<Text> valueSet,
         protected void cleanup(Context context){
             try {
                 System.out.println("Number of events reduced "+numEvents);
-                String propertiesStr = new String("gctdeltaduration:"+context.getConfiguration().get("deltaTime")+"\nmin_write_event_start_time:"+min+"\nmax_write_event_start_time:"+max);
+                String propertiesStr = new String("gctdeltaduration:"+context.getConfiguration().get("deltaTime")+"\nmin_write_event_start_time:"+min+"\nmax_write_event_start_time:"+max+"\nupdate_interleave:"+(max-min)/numEvents);
                 properties.write(propertiesStr.getBytes("UTF8"));
                 properties.flush();
                 properties.close();