Yandex Tank 
Yandextank 1.9.0 now available! Read release notes.
Yandex.Tank is an extensible open source load testing tool for advanced linux users which is especially good as a part of an automated load testing suite
Main features
- different load generators supported:
- performance analytics backend service: Overload. Store and analyze your test results online
- several ammo formats supported like plain url list or access.log
- test autostop plugin: stop your test when the results have became obvious and save time
- customizable and extendable monitoring that works over SSH
Documentation
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Rest of documentation
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Stackoverflow – use
load-testing+yandextags
Get help
Chat with authors and other performance specialists:
See also
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Overload? – performance analytics server
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Evgeniy Mamchits' phantom – phantom scalable IO engine
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Vagrant environment with Yandex.Tank by Dmitry Porozhnyakov
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BlazeMeter Sense – performance testing analytics by BlazeMeter. Currently only with 1.7 branch