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Proxies and servers both have a queueslength entry, that indicates how many entries there are in their request queues. Those can get a lot of contention, and they are often accessed just to know if the queue is empty or not, which it will always be when there is no maxconn. So for both, introduce a new field, "queues_not_empty", in a different, less contended cache line, and use it every time we just want to know if the queue is empty or not. Those are only changed when the queues goes from empty to non-empty, and vice-versa, which hopefully should not be too often. For proxies, they are protected by the proxy lock. For servers, they are protected by a new lock contained in the server, the status_lock. In both case, to prevent any race condition, once the relevant lock is held, the value of queueslength should be checked again before deciding to change or not queues_not_empty, to prevent any race condition.
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
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)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.