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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
112,921 100,676 28% 35% 18% 14% 5,458 94% 3% 3% 0%
- Simulation Users 5
1,656 1,654 59% 15% 14% 11% 146 81% 14% 4% 1%
- Interactive Users 6
16,333 14,857 32% 43% 14% 10% 1,041 97% 0% 3% 0%
- Download Users 7
98,863 88,006 29% 33% 18% 15% 1,085 96% 1% 3% 0%
Table 2: Simulation Usage
Simulation Users 5 1,656 users
Simulation Runs 45,325 jobs
Total CPU Time 606 days  
Total Wall Time 4,839 days  
Total Interaction Time 1,030 days  
Users with > 10 mins of CPU Time 168 users  
Avg. Number of Simulation Runs/User 27 jobs  
Avg. Time between First and Last Simulation 162 days  
Repeat Users with > 10 Simulation Jobs 344 users  
Repeat Users with > 3 Months 9 485 users  
Table 3: Miscellaneous Statistics
Domains Served 15,875
Cumulative Interactive User Sessions 10 68,896
Cumulative Session Time 2,446 days
Visitors 11 345,233
Visits 12 734,643
New Accounts 2,043
Max User Logins 136 users on 2013-10-10
Web Server Hits 27,843,639
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
112,921 100,676 28% 35% 18% 14% 5,458 94% 3% 3% 0%
- Registered Users 2
3,010 3,004 58% 18% 13% 10% 274 79% 14% 5% 2%
- Unregistered Interactive Users 3
13,876 12,440 25% 48% 14% 10% 713 93% 2% 5% 0%
- Unregistered Download Users 4
96,035 85,232 28% 34% 19% 15% 4,471 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.