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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
30,290 29,687 37% 29% 23% 11% 2,695 93% 3% 4% 0%
- Simulation Users 5
951 948 59% 17% 14% 10% 23 100% 0% 0% 0%
- Interactive Users 6
7,717 7,489 50% 25% 17% 9% 1,056 97% 0% 2% 0%
- Download Users 7
23,701 23,366 35% 30% 24% 11% 805 97% 1% 2% 0%
Table 2: Simulation Usage
Simulation Users 5 951 users
Simulation Runs 17,438 jobs
Total CPU Time 158 days  
Total Wall Time 5,789 days  
Total Interaction Time 966 days  
Users with > 10 mins of CPU Time 191 users  
Avg. Number of Simulation Runs/User 18 jobs  
Avg. Time between First and Last Simulation 22,507 days  
Repeat Users with > 10 Simulation Jobs 235 users  
Repeat Users with > 3 Months 9 298 users  
Table 3: Miscellaneous Statistics
Domains Served 10,240
Cummulative Interactive User Sessions 10 40,489
Cummulative Session Time 2,308 days
Visitors 11 135,393
Visits 12 306,015
New Accounts 1,748
Max User Logins 147 users on 2011-10-04
Web Server Hits 35,671,983
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
30,290 29,687 37% 29% 23% 11% 2,695 93% 3% 4% 0%
- Registered Users 2
2,454 2,389 67% 14% 11% 7% 46 98% 0% 0% 2%
- Unregistered Interactive Users 3
5,764 5,552 42% 28% 19% 10% 812 93% 2% 6% 0%
- Unregistered Download Users 4
22,072 21,746 32% 31% 25% 12% 1,837 93% 4% 4% 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.