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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
120,389 116,747 28% 36% 18% 13% 5,546 94% 3% 3% 0%
- Simulation Users 5
1,561 1,559 59% 15% 13% 11% 127 82% 13% 4% 1%
- Interactive Users 6
21,104 19,705 29% 47% 14% 9% 1,194 97% 0% 3% 0%
- Download Users 7
101,905 99,572 29% 33% 19% 14% 1,174 96% 1% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,561 users
Simulation Runs 44,754 jobs
Total CPU Time 858 days  
Total Wall Time 4,881 days  
Total Interaction Time 929 days  
Users with > 10 mins of CPU Time 185 users  
Avg. Number of Simulation Runs/User 29 jobs  
Avg. Time between First and Last Simulation 168 days  
Repeat Users with > 10 Simulation Jobs 320 users  
Repeat Users with > 3 Months 9 461 users  
Table 3: Miscellaneous Statistics
Domains Served 17,979
Cumulative Interactive User Sessions 10 96,415
Cumulative Session Time 3,426 days
Visitors 11 390,865
Visits 12 1,078,249
New Accounts 2,041
Max User Logins 131 users on 2014-07-16
Web Server Hits 33,456,113
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
120,389 116,747 28% 36% 18% 13% 5,546 94% 3% 3% 0%
- Registered Users 2
3,085 3,076 59% 18% 11% 11% 283 78% 15% 5% 2%
- Unregistered Interactive Users 3
18,316 16,985 23% 51% 15% 9% 900 94% 1% 5% 0%
- Unregistered Download Users 4
98,988 96,686 28% 34% 19% 14% 4,363 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.