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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
95,462 92,990 28% 37% 18% 13% 4,206 93% 3% 3% 0%
- Simulation Users 5
1,251 1,250 60% 16% 12% 11% 112 82% 13% 4% 1%
- Interactive Users 6
16,273 15,663 29% 48% 14% 9% 975 96% 0% 3% 0%
- Download Users 7
81,647 79,714 30% 34% 18% 14% 1,077 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 1,251 users
Simulation Runs 36,237 jobs
Total CPU Time 777 days  
Total Wall Time 3,841 days  
Total Interaction Time 843 days  
Users with > 10 mins of CPU Time 173 users  
Avg. Number of Simulation Runs/User 29 jobs  
Avg. Time between First and Last Simulation 181 days  
Repeat Users with > 10 Simulation Jobs 267 users  
Repeat Users with > 3 Months 9 401 users  
Table 3: Miscellaneous Statistics
Domains Served 15,175
Cumulative Interactive User Sessions 10 69,417
Cumulative Session Time 2,560 days
Visitors 11 307,687
Visits 12 836,792
New Accounts 1,591
Max User Logins 131 users on 2014-07-16
Web Server Hits 25,369,044
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
95,462 92,990 28% 37% 18% 13% 4,206 93% 3% 3% 0%
- Registered Users 2
2,503 2,496 60% 17% 11% 11% 246 78% 14% 5% 3%
- Unregistered Interactive Users 3
13,920 13,362 22% 53% 15% 8% 611 93% 1% 5% 0%
- Unregistered Download Users 4
79,039 77,132 28% 35% 18% 14% 3,349 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.