{"action":"created","issue":{"url":"https://api.github.com/repos/geerlingguy/raspberry-pi-dramble/issues/14","labels_url":"https://api.github.com/repos/geerlingguy/raspberry-pi-dramble/issues/14/labels{/name}","comments_url":"https://api.github.com/repos/geerlingguy/raspberry-pi-dramble/issues/14/comments","events_url":"https://api.github.com/repos/geerlingguy/raspberry-pi-dramble/issues/14/events","html_url":"https://github.com/geerlingguy/raspberry-pi-dramble/issues/14","id":58440032,"number":14,"title":"Test power consumption/CPU stability with stress and Kill-a-Watt","user":{"login":"geerlingguy","id":481677,"avatar_url":"https://avatars.githubusercontent.com/u/481677?v=3","gravatar_id":"","url":"https://api.github.com/users/geerlingguy","html_url":"https://github.com/geerlingguy","followers_url":"https://api.github.com/users/geerlingguy/followers","following_url":"https://api.github.com/users/geerlingguy/following{/other_user}","gists_url":"https://api.github.com/users/geerlingguy/gists{/gist_id}","starred_url":"https://api.github.com/users/geerlingguy/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/geerlingguy/subscriptions","organizations_url":"https://api.github.com/users/geerlingguy/orgs","repos_url":"https://api.github.com/users/geerlingguy/repos","events_url":"https://api.github.com/users/geerlingguy/events{/privacy}","received_events_url":"https://api.github.com/users/geerlingguy/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":3,"created_at":"2015-02-21T03:43:27Z","updated_at":"2015-02-23T23:05:45Z","closed_at":null,"body":"This will be helpful information when it comes time to work on a potential inline UPS.\r\n\r\nSome numbers:\r\n\r\n| Pi State | Power Consumption | Per Pi (average) |\r\n| ---------- | ----------- | ------------ |\r\n| Idle | 170 mA (7.2W) | 28 mA (1.2W) |\r\n| 400% CPU load | 230 mA (11.4W) | 38 mA (1.9W) |\r\n| 400% CPU load, 1x USB 64GB SSD | 300 mA (13.6W) | 50 mA (2.3W) |\r\n\r\nThese readings were taken with the Pis in the following configuration:\r\n\r\n  - 6x Raspberry Pi 2, all powered on.\r\n  - Headless (no video displays attached).\r\n  - No USB devices attached (except as noted).\r\n  - Onboard LAN connected to Gigabit network switch.\r\n  - Powered via 6-port USB power supply.\r\n  - Kill A Watt meter (for measurements) was plugged into wall, then USB power supply was plugged into the Kill A Watt.\r\n  - CPU stress tests were done using `stress -c 4` to max out all 4 CPU cores."},"comment":{"url":"https://api.github.com/repos/geerlingguy/raspberry-pi-dramble/issues/comments/75657682","html_url":"https://github.com/geerlingguy/raspberry-pi-dramble/issues/14#issuecomment-75657682","issue_url":"https://api.github.com/repos/geerlingguy/raspberry-pi-dramble/issues/14","id":75657682,"user":{"login":"geerlingguy","id":481677,"avatar_url":"https://avatars.githubusercontent.com/u/481677?v=3","gravatar_id":"","url":"https://api.github.com/users/geerlingguy","html_url":"https://github.com/geerlingguy","followers_url":"https://api.github.com/users/geerlingguy/followers","following_url":"https://api.github.com/users/geerlingguy/following{/other_user}","gists_url":"https://api.github.com/users/geerlingguy/gists{/gist_id}","starred_url":"https://api.github.com/users/geerlingguy/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/geerlingguy/subscriptions","organizations_url":"https://api.github.com/users/geerlingguy/orgs","repos_url":"https://api.github.com/users/geerlingguy/repos","events_url":"https://api.github.com/users/geerlingguy/events{/privacy}","received_events_url":"https://api.github.com/users/geerlingguy/received_events","type":"User","site_admin":false},"created_at":"2015-02-23T23:05:45Z","updated_at":"2015-02-23T23:05:45Z","body":"Measurements on the database Pi:\r\n\r\n| Pi State | Power Consumption | Per Pi (average) |\r\n| ---------- | ----------- | ------------ |\r\n| Powering on, 1x USB 64GB SSD | 900-1400 mA (~4.5W) |\r\n| Idle, 1x USB 64GB SSD | 960 mA (~4.8W) |\r\n| `ab -n 100 -c 10` (uncached), 1x USB 64GB SSD | 1100 mA (~5.5W) |\r\n| 400% CPU load, 1x USB 64GB SSD | 1250 mA (~6.25W) |"}}