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Users may have good reasons for using "tune.idle-pool.shared off", one of them being the cost of moving cache lines between cores, or the kernel- side locking associated with moving FDs. For this reason, when getting close to the file descriptors limits, we must not try to kill adjacent threads' FDs when the sharing of pools is disabled. This is extremely expensive and kills the performance. We must limit ourselves to our local FDs only. In such cases, it's up to the users to configure a large enough maxconn for their usages. Before this patch, perf top reported 9% CPU usage in connect_server() onthe trylock used to kill connections when running at 4800 conns for a global maxconn of 6400 on a 128-thread server. Now it doesn't spend its time there anymore, and performance has increased by 12%. Note, it was verified that disabling the locks in such a case has no effect at all, so better keep them and stay safe. |
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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.