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Measures ping times between servers and collects the information in a nice chart.
JavaScript
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pulse.js

README.md

Collects ping times between a list of servers and displays in a chart.

Node Pulse

How to use

Install this on each server you want to add to the pool to be measured. Copy config.template.js to config.js and update the list of servers as appropriate. I've found it works quite a bit better if you enter the servers' IP addresses to avoid doing a DNS lookup each time.

Start the scripts on all the servers as background processes, such as with this command: nohup node pulse.js & They will begin collecting timing information from each server in the list, and will send that information to each other server as well.

You can then visit http://example.com:50505/stats on any one of the servers to see its report.

License

Copyright (c) 2011 Aaron Parecki

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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