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In multi-threaded mode, on operating systems supporting multiple listeners on the same IP:port, this will automatically create this number of multiple identical listeners for the same line, all bound to a fair share of the number of the threads attached to this listener. This can sometimes be useful when using very large thread counts where the in-kernel locking on a single socket starts to cause a significant overhead. In this case the incoming traffic is distributed over multiple sockets and the contention is reduced. Note that doing this can easily increase the CPU usage by making more threads work a little bit. If the number of shards is higher than the number of available threads, it will automatically be trimmed to the number of threads. A special value "by-thread" will automatically assign one shard per thread.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)