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MAX_THREADS was not changed when setting MAX_TGROUPS, which still limits some possibilities. Let's preset it to 4 * LONGBITS when MAX_TGROUPS is larger than 1, or LONGBITS when it's set to 1. This means that the new default value is 256 threads. The rationale behind this is that the main use of thread groups is mostly to address NUMA issues and that we don't necessarily need large thread counts when using many groups, and 256 threads is already plenty even on quite large systems. For now it's important not to go too far because some internal structs are arrays of MAX_THREADS entries, for example accept_queue_ring, which is around 8kB per thread. Such structures will need to become dynamic before defaulting to large thread counts (at 4096 threads max the accept queues would require 32 MB RAM alone).
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)