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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
139,463 134,616 28% 36% 19% 14% 6,242 94% 3% 3% 0%
- Simulation Users 5
1,439 1,437 58% 16% 12% 12% 123 81% 15% 4% 0%
- Interactive Users 6
23,903 22,839 26% 44% 17% 11% 1,230 96% 0% 3% 0%
- Download Users 7
118,458 114,576 29% 33% 19% 14% 1,255 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,439 users
Simulation Runs 50,254 jobs
Total CPU Time 808 days  
Total Wall Time 16,679 days  
Total Interaction Time 898 days  
Users with > 10 mins of CPU Time 260 users  
Avg. Number of Simulation Runs/User 35 jobs  
Avg. Time between First and Last Simulation 184 days  
Repeat Users with > 10 Simulation Jobs 313 users  
Repeat Users with > 3 Months 9 443 users  
Table 3: Miscellaneous Statistics
Domains Served 19,637
Cumulative Interactive User Sessions 10 102,380
Cumulative Session Time 3,464 days
Visitors 11 421,954
Visits 12 1,180,339
New Accounts 1,889
Max User Logins 131 users on 2014-07-16
Web Server Hits 33,541,844
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
139,463 134,616 28% 36% 19% 14% 6,242 94% 3% 3% 0%
- Registered Users 2
2,885 2,876 59% 17% 11% 11% 279 79% 14% 4% 3%
- Unregistered Interactive Users 3
21,116 20,119 21% 48% 18% 11% 1,016 95% 1% 4% 0%
- Unregistered Download Users 4
115,462 111,621 28% 34% 19% 14% 4,947 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.