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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
177,505 162,030 24% 42% 23% 10% 20,983 93% 4% 2% 1%
- Simulation Users 5
7,041 2,891 46% 27% 16% 11% 3,024 92% 4% 1% 3%
- Interactive Users 6
40,264 37,195 29% 42% 20% 9% 6,259 96% 2% 1% 0%
- Download Users 7
150,894 147,863 25% 41% 24% 11% 16,837 95% 3% 2% 0%
Total Users (old defn) 8
47,329 - - - - - - - - - -
Table 2: Simulation Usage
Simulation Users 5 7,041 users
Simulation Runs 299,378 jobs
Total CPU Time 9,472 days  
Total Wall Time 19,041 days  
Total Interaction Time 5,358 days  
Users with > 10 mins of CPU Time 2,309 users  
Avg. Number of Simulation Runs/User 43 jobs  
Avg. Time between First and Last Simulation 506 days  
Repeat Users with > 10 Simulation Jobs 3,255 users  
Repeat Users with > 3 Months 9 2,011 users  
Table 3: Miscellaneous Statistics
Domains Served 14,637
Cummulative Interactive User Sessions 10 113,066
Cummulative Session Time 4,631 days
Visitors 11 405,342
Visits 12 1,298,798
New Accounts 7,554
Max User Logins 1000 users on 2014-02-19
Web Server Hits 49,894,625
Table 4: Collaboration Usage
Shared Tool Sessions 13 80
New tools under development 29
Table 5: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
177,505 162,030 24% 42% 23% 10% 20,983 93% 4% 2% 1%
- Registered Users 2
16,304 4,481 46% 28% 16% 10% 4,673 89% 6% 1% 4%
- Unregistered Interactive Users 3
25,097 23,767 23% 47% 22% 8% 2,390 96% 3% 2% 0%
- Unregistered Download Users 4
136,104 133,782 24% 42% 24% 11% 13,920 95% 3% 2% 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.

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