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A big deal of the task_queue() contention is caused by this function because it's created using task_new_anywhere() and is subject to heavy updates. Let's turn it to single thread by rotating the assigned threads during initialization so that a table only runs on one thread at a time. However there's a trick: the function used to call task_queue() to requeue the task if it had advanced its timer (may only happen when learning an entry from a peer). We can't do that anymore since we can't queue another thread's task. Thus instead of the task needs to be scheduled earlier than previously planned, we simply perform a wakeup. It will likely do nothing and will self-adjust its next wakeup timer. Doing so halves the number of multi-thread task wakeups. In addition the request rate at saturation increased by 12% with 16 peers and 40 tables on a 16 8-thread processes. This should improve the situation described by Felipe in issues #3084 and #3101. This should be backported to 3.2 after some extended checks.
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.