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HAProxy - Load balancer
facfad2b64
Pools are being used so well that it becomes difficult to profile their usage via the regular memory profiling. Let's add new entries for pools there, named "p_alloc" and "p_free" that correspond to pool_alloc() and pool_free(). Ideally it would be nice to only report those that fail cache lookups but that's complicated, particularly on the free() path since free lists are released in clusters to the shared pools. It's worth noting that the alloc_tot/free_tot fields can easily be determined by multiplying alloc_calls/free_calls by the pool's size, and could be better used to store a pointer to the pool itself. However it would require significant changes down the code that sorts output. If this were to cause a measurable slowdown, an alternate approach could consist in using a different value of USE_MEMORY_PROFILING to enable pools profiling. Also, this profiler doesn't depend on intercepting regular malloc functions, so we could also imagine enabling it alone or the other one alone or both. Tests show that the CPU overhead on QUIC (which is already an extremely intensive user of pools) jumps from ~7% to ~10%. This is quite acceptable in most deployments. |
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The HAProxy documentation has been split into a number of different files for ease of use. 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)