Notification Log Analysis

Table 2 shows the overall statistics for the notification logs. In one week, the server sent out 3.25 million notification messages for a total of 295 megabytes. One fourth of the messages sent out were distinct, while the remaining messages had the same content but sent to different users (in some cases, the same message is sent to a user multiple times, e.g., if a user has registered for information to be delivered at specific times and the information has not changed during that period). The significant amount of duplication in messages sent to different users suggests that sending notification via application-level multicast would be useful; Section 4.2 examines this issue in greater depth. There were 200,860 distinct users, of which 99.02% were wireless users. The notifications were sent at the average rate of 323 messages per minute. The peak rate was much higher, approximately 30 times as high as the average rate.

 

Table 2: Overall statistics for the notification logs for the period from Aug 20 through Aug 26, 2000.

Total messages	3,251,537
Total distinct messages	884,272
Total bytes transmitted	295 MB
Total bytes of unique messages transmitted	71.3 MB
Total number of users	200,860
Total number of wireless users	198,882
Avg. notification rate	322.57 (msgs/min)
Peak notification rate	9502 (msgs/min)