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Jakub Vojacek reported in issue #1955 that haproxy 2.7.0 doesn't start anymore on a 128-CPU machine with a default config. The reason is the raise of the default MAX_THREADS value that came with thread groups. Previously, the maximum number of threads was simply limited to this value, and all of them fit into one group. Now the limit being higher, all threads cannot fit by default into a single group, and haproxy fails to start. The solution adopted here is to continue to limit the number of threads to the max supported per group, but to multiply it by the number of groups (usually 1 by default). In addition, a diag warning is now emitted when this happens, reminding the user to set nbthread or adjust thread-groups. We can hardly do more than a diag warning if we don't want to make the upgrade painful for users. Thanks to Jakub for reporting this early. This must be backported to 2.7.
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)