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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
109,569 96,712 28% 36% 18% 13% 4,818 94% 3% 3% 0%
- Simulation Users 5
1,560 1,559 59% 15% 13% 12% 126 83% 13% 4% 1%
- Interactive Users 6
17,309 14,895 29% 47% 14% 9% 976 97% 0% 3% 0%
- Download Users 7
94,358 83,800 29% 33% 19% 14% 1,024 96% 1% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,560 users
Simulation Runs 43,080 jobs
Total CPU Time 809 days  
Total Wall Time 4,541 days  
Total Interaction Time 963 days  
Users with > 10 mins of CPU Time 170 users  
Avg. Number of Simulation Runs/User 28 jobs  
Avg. Time between First and Last Simulation 633 days  
Repeat Users with > 10 Simulation Jobs 315 users  
Repeat Users with > 3 Months 9 451 users  
Table 3: Miscellaneous Statistics
Domains Served 15,228
Cumulative Interactive User Sessions 10 80,926
Cumulative Session Time 2,593 days
Visitors 11 340,419
Visits 12 817,132
New Accounts 1,972
Max User Logins 136 users on 2013-10-10
Web Server Hits 27,096,937
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
109,569 96,712 28% 36% 18% 13% 4,818 94% 3% 3% 0%
- Registered Users 2
2,960 2,953 57% 18% 12% 11% 273 78% 14% 5% 3%
- Unregistered Interactive Users 3
14,959 12,616 22% 52% 14% 9% 625 93% 2% 6% 0%
- Unregistered Download Users 4
91,650 81,143 28% 34% 19% 14% 3,920 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.