Usage: Usage Tables

Table 1: User statistics
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1 10,365 10,530 10,790 11,576 12,861 13,853 14,072 14,771 14,538 13,788 13,105 12,321 12,321 9,049 61% 16% 13% 8% 316 84% 1% 10% 5%
- Simulation Users 5 46 47 48 44 44 45 46 24 21 24 23 25 493 25 92% 0% 4% 0% 49 67% 2% 10% 20%
- Interactive Users 6 1,174% 1,207% 1,255% 1,299% 1,313% 1,337% 1,379% 1,696% 1,714% 1,722% 1,691% 1,552% 4,218 3,855 40% 37% 13% 6% 214 96% 0% 4% 0%
- Download Users 7 1,228% 1,221% 1,172% 1,151% 1,167% 1,157% 1,064% 1,077% 1,046% 979% 980% 935% 7,599 7,024 66% 13% 10% 9% 49 96% 0% 4% 0%
Table 2: Simulation Usage
Simulation Users 5 493 users  
Simulation Jobs 16,118 jobs  
Total CPU Time 45 days  
Total Wall Time 1,200 days  
Total Interaction Time 352 days  
Users with > 10 mins of CPU Time 112 users  
Avg. Number of Simulation Jobs/User 33 jobs  
Avg. Time between First and Last Simulation 245 days  
Repeat Users with > 10 Simulation Jobs 171 users  
Repeat Users with > 3 Months 9 114 users  
Table 3: Miscellaneous Statistics
Domains Served 4,879
Cumulative Interactive User Sessions 10 15,892
Cumulative Session Time 1,146 days
Visitors 11 101,482
Visits 12 219,306
New Accounts 2,344
Max User Logins 69 users on 2019-04-15
Web Server Hits 10,364,996
Table 4: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1 10,365 10,530 10,790 11,576 12,861 13,853 14,072 14,771 14,538 13,788 13,105 12,321 12,321 9,049 61% 16% 13% 8% 316 84% 1% 10% 5%
- Registered Users 2 1% 1% 1% 1% 1% 1% 1% 1% 0% 0% 0% 0% 2,531 30 97% 0% 0% 0% 54 59% 4% 9% 28%
- Unregistered Interactive Users 3 128 115 110 106 102 120 133 118 113 104 92 86 2,356 2,159 47% 24% 20% 5% 86 93% 1% 6% 0%
- Unregistered Download Users 4 268% 252% 254% 250% 238% 249% 250% 230% 217% 189% 168% 154% 7,434 6,860 66% 13% 10% 9% 176 88% 0% 13% 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.