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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
135,376 125,515 29% 34% 18% 14% 6,325 94% 2% 3% 0%
- Simulation Users 5
978 976 56% 16% 12% 13% 86 80% 15% 5% 0%
- Interactive Users 6
20,463 19,167 28% 40% 19% 12% 972 97% 0% 2% 0%
- Download Users 7
118,079 109,597 30% 33% 18% 14% 1,171 97% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 978 users
Simulation Runs 39,860 jobs
Total CPU Time 1,067 days  
Total Wall Time 21,648 days  
Total Interaction Time 400 days  
Users with > 10 mins of CPU Time 262 users  
Avg. Number of Simulation Runs/User 41 jobs  
Avg. Time between First and Last Simulation 208 days  
Repeat Users with > 10 Simulation Jobs 226 users  
Repeat Users with > 3 Months 9 315 users  
Table 3: Miscellaneous Statistics
Domains Served 18,915
Cumulative Interactive User Sessions 10 77,151
Cumulative Session Time 2,357 days
Visitors 11 388,107
Visits 12 903,896
New Accounts 1,121
Max User Logins 116 users on 2014-10-07
Web Server Hits 23,934,293
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
135,376 125,515 29% 34% 18% 14% 6,325 94% 2% 3% 0%
- Registered Users 2
2,182 1,975 57% 18% 11% 12% 202 83% 12% 3% 1%
- Unregistered Interactive Users 3
17,983 16,755 23% 43% 20% 12% 925 95% 2% 3% 0%
- Unregistered Download Users 4
115,211 106,785 29% 33% 18% 14% 5,198 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.
  14. Metrics are calculated and updated at the beginning of each month.