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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
114,315 102,257 28% 36% 18% 14% 5,206 94% 3% 3% 0%
- Simulation Users 5
1,650 1,639 59% 15% 14% 12% 139 82% 14% 4% 1%
- Interactive Users 6
17,568 15,526 29% 46% 13% 9% 1,007 97% 0% 3% 0%
- Download Users 7
98,887 88,766 29% 34% 18% 14% 1,062 96% 1% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,650 users
Simulation Runs 45,694 jobs
Total CPU Time 680 days  
Total Wall Time 4,901 days  
Total Interaction Time 1,034 days  
Users with > 10 mins of CPU Time 181 users  
Avg. Number of Simulation Runs/User 28 jobs  
Avg. Time between First and Last Simulation 165 days  
Repeat Users with > 10 Simulation Jobs 344 users  
Repeat Users with > 3 Months 9 482 users  
Table 3: Miscellaneous Statistics
Domains Served 15,482
Cumulative Interactive User Sessions 10 76,816
Cumulative Session Time 2,562 days
Visitors 11 347,597
Visits 12 802,321
New Accounts 2,128
Max User Logins 136 users on 2013-10-10
Web Server Hits 28,433,012
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
114,315 102,257 28% 36% 18% 14% 5,206 94% 3% 3% 0%
- Registered Users 2
3,117 3,111 58% 17% 13% 11% 284 79% 14% 5% 2%
- Unregistered Interactive Users 3
15,110 13,129 23% 52% 14% 9% 667 93% 2% 5% 0%
- Unregistered Download Users 4
96,088 86,017 28% 34% 18% 14% 4,255 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.