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This counter is solely used for reporting in the stats and is the hottest thread contention point to date. Moving it to the scheduler and having a separate one for the global run queue dramatically improves the performance, showing a 12% boost on the request rate on 16 threads! In addition, the thread debugging output which used to rely on rqueue_size was not totally accurate as it would only report task counts. Now we can return the exact thread's run queue length. It is also interesting to note that there are still a few other task/tasklet counters in the scheduler that are not efficiently updated because some cover a single area and others cover multiple areas. It looks like having a distinct counter for each of the following entries would help and would keep the code a bit cleaner: - global run queue (tree) - per-thread run queue (tree) - per-thread shared tasklets list - per-thread local lists Maybe even splitting the shared tasklets lists between pure tasklets and tasks instead of having the whole and tasks would simplify the code because there remain a number of places where several counters have to be updated.
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)