raspberry-pi-dramble

I use Watts on the page where I aggregate my results[1], but since most USB-related projects measure mA (and most battery ratings use mAh), I use the same convention as a default, since 5V can be assumed in all cases. [1] https://github.com/geerlingguy/raspberry-pi-dramble/wiki/Pow...

For sure: "Jetson TX1 draws as little as 1 watt of power or lower while idle, around 8-10 watts under typical CUDA load, and up to 15 watts TDP when the module is fully utilized, for example during gameplay and the most demanding vision routines."[1] Anecdotally, the RPi2 has been measured[2] around 4-6 watts under load and the Edison was measured[3] around 1 watt. [1] http://devblogs.nvidia.com/parallelforall/nvidia-jetson-tx1-... [2] https://github.com/geerlingguy/raspberry-pi-dramble/wiki/Pow... [3] https://www.openice.info/2015/07/24/three-days-with-intel-ed...

A cluster of six Raspberry Pi 2s running Drupal (a PHP CMS) is about 20% slower than a single i7 laptop with an SSD for general usage, and can be _much_ slower if your usage requires lots of disk or network I/O. The 4-core ARMv7 chip in the Pi 2 is way faster than the chip in previous Pis, but it's not a speed demon by any means. And the network I/O (and all I/O) being tied down to a slowish USB 2.0 bus means you're limited to ~90 Mbps through LAN, or ~200 Mbps if you use a USB 3.0 network adapter. Even trying a fast SSD plugged into one of the USB ports (rather than a comparatively slow 'Extreme Pro' microSD card), you won't get a huge performance boost because of limited I/O bandwidth. See many, many more benchmarks on this wiki: https://github.com/geerlingguy/raspberry-pi-dramble/wiki P.S. I have a cluster of six Pi 2s running http://w

I have an educational site running on my cluster of 6 Pi 2s in my basement: http://www.pidramble.com/ Code, tutorial, parts list, etc. here: https://github.com/geerlingguy/raspberry-pi-dramble

As someone else who's also built a cluster of Pi 2s, I would agree that the primary purpose is education and fun/tinkering, not performance. That being said, for light web hosting purposes, a cluster of six Pi 2s performs roughly 70% as well as a similar cluster of 6 VMs on Digital Ocean. See more on this project's wiki, in the performance/benchmarking section: https://github.com/geerlingguy/raspberry-pi-dramble

With the Pi 2, it's not as bad as you'd think; see: https://github.com/geerlingguy/raspberry-pi-dramble/wiki/Dra... (Drupal 8 on a 6-server Pi 2 LEMP + Redis stack is about 80% as fast as running on Digital Ocean, in some benchmarks). For test purposes, a local Pi cloud (or something similarly-priced) is a decent deal.