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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
137,460 133,003 28% 36% 19% 14% 6,085 94% 3% 3% 0%
- Simulation Users 5
1,467 1,463 59% 16% 12% 12% 130 82% 13% 4% 1%
- Interactive Users 6
24,287 23,248 26% 45% 17% 10% 1,228 96% 0% 3% 0%
- Download Users 7
116,044 112,533 29% 33% 19% 14% 1,256 96% 0% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,467 users
Simulation Runs 49,922 jobs
Total CPU Time 791 days  
Total Wall Time 16,721 days  
Total Interaction Time 909 days  
Users with > 10 mins of CPU Time 251 users  
Avg. Number of Simulation Runs/User 34 jobs  
Avg. Time between First and Last Simulation 177 days  
Repeat Users with > 10 Simulation Jobs 313 users  
Repeat Users with > 3 Months 9 458 users  
Table 3: Miscellaneous Statistics
Domains Served 19,556
Cumulative Interactive User Sessions 10 103,314
Cumulative Session Time 3,511 days
Visitors 11 422,031
Visits 12 1,182,575
New Accounts 1,915
Max User Logins 131 users on 2014-07-16
Web Server Hits 33,724,125
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
137,460 133,003 28% 36% 19% 14% 6,085 94% 3% 3% 0%
- Registered Users 2
2,900 2,891 60% 17% 11% 11% 276 79% 13% 5% 3%
- Unregistered Interactive Users 3
21,511 20,539 21% 49% 18% 11% 1,027 95% 1% 4% 0%
- Unregistered Download Users 4
113,049 109,573 28% 34% 19% 14% 4,782 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.