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shm_stats_file_reuse_object() has a non negligible cost, especially if the shm file contains a lot of objects because the functions scans the whole shm file to find available slots. During startup, if no existing objects could be mapped in the shm file shm_stats_file_add_object() for each object (server, fe, be or listener) with a GUID set. On large config it means shm_stats_file_add_object() could be called a lot of times in a row. With current implementation, each shm_stats_file_add_object() call leverages shm_stats_file_reuse_object(), so the more objects are defined in the config, the slower the startup will be. To try to optimize startup time a bit with large configs, we don't sytematically call shm_stats_file_reuse_object(), especially when we know that the previous attempt to reuse objects failed. In this case we add a small tempo between failed attempts to reuse objects because we assume the new attempt will probably fail anyway. (For slots to become available, either an old process has to clean its entries, or they have to time out which implies that the clock needs to be updated)
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.