a7b2353cb3
Damien Claisse reported in issue #3257 a performance regression between 3.2 and 3.3 when task profiling is enabled, more precisely in relation with the following patches were merged: 98cc815e3e ("MINOR: activity: collect time spent with a lock held for each task") 503084643f ("MINOR: activity: collect time spent waiting on a lock for each task") 9d8c2a888b ("MINOR: activity: collect CPU time spent on memory allocations for each task") The issue mostly comes from the first patches. What happens is that the local time is taken when entering and leaving each lock, which costs a lot on a contended system. The problem here is the lack of finegrained settings for lock and malloc profiling. This patch introduces a better approach. The task profiler goes back to its default behavior in on/auto modes, but the configuration now accepts new extra options "lock", "no-lock", "memory", "no-memory" to precisely indicate other timers to watch for each task when profiling turns on. This is achieved by setting two new flags HA_PROF_TASKS_LOCK and HA_PROF_TASKS_MEM in the global "profiling" variable. This patch only parses the new values and assigns them to the global variable from the config file for now. The doc was 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.