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Usage: Overview

Table 1: User statistics
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
109,367 90,175 28% 34% 18% 15% 5,732 94% 3% 3% 0%
- Simulation Users 5
1,562 1,554 59% 13% 15% 12% 140 80% 15% 4% 1%
- Interactive Users 6
16,247 12,810 36% 36% 15% 12% 1,085 97% 0% 3% 0%
- Download Users 7
95,446 79,542 28% 33% 19% 16% 1,073 96% 1% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,562 users
Simulation Runs 35,028 jobs
Total CPU Time 381 days  
Total Wall Time 5,255 days  
Total Interaction Time 735 days  
Users with > 10 mins of CPU Time 160 users  
Avg. Number of Simulation Runs/User 22 jobs  
Avg. Time between First and Last Simulation 154 days  
Repeat Users with > 10 Simulation Jobs 286 users  
Repeat Users with > 3 Months 9 485 users  
Table 3: Miscellaneous Statistics
Domains Served 15,798
Cumulative Interactive User Sessions 10 68,211
Cumulative Session Time 2,710 days
Visitors 11 331,476
Visits 12 705,964
New Accounts 2,105
Max User Logins 190 users on 2013-04-17
Web Server Hits 31,252,883
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
109,367 90,175 28% 34% 18% 15% 5,732 94% 3% 3% 0%
- Registered Users 2
3,066 3,057 59% 16% 15% 10% 258 79% 14% 6% 1%
- Unregistered Interactive Users 3
13,667 10,313 29% 40% 15% 13% 871 93% 2% 5% 0%
- Unregistered Download Users 4
92,634 76,805 27% 34% 19% 16% 4,603 95% 2% 3% 0%

  1. Sum of Registered Users2, Unregistered Interactive Users3 and Unregistered Download Users4
  2. Number of Users that logged in. User registration assigns a unique login to each individual user.
  3. Number of Unregistered Users, identified by unique hosts/IPs, that had an active Session 10 without logging in. Does not include known web bots/crawlers.
  4. Number of Unregistered users, identified by unique hosts/IPs, that had an active session of less than 15 minutes without logging in and downloaded a non-interactive resource such as PDF or podcast. Does not include web bots/crawlers.
  5. Number of Registered Users2 that ran one or more simulation runs.
  6. All Unregistered Users, identified by unique hosts/IPs, that had an active Session 10. Does not include known web bots/crawlers.
  7. All Unregistered users, identified by unique hosts/IPs that downloaded a non-interactive resource such as PDF or podcast. Does not include known web bots/crawlers.
  8. Sum of Simulation Users 5 + Unregistered Interactive Users 3 including web bots/crawlers.
  9. Number of Simulation users that returned after a gap of 3 months.
  10. Begins when an IP is active on the site for at least 15 minutes. Ends when inactive for more than 30 minutes, including time spent viewing videos.
  11. Identified by a unique IP address / hostname.
  12. Based on MIT OCW metric of Visits: A visit is activity by a unique visitor delimitated by a 30 minute absence from the site on either side of the activity.
    These visits correspond to unique visitors 11. Does not include known web bots/crawlers
  13. Number of Simulation sessions that were shared between 2 or more users.