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0bae075928
We've reached a point where the global pools represent a significant bottleneck with threads. On a 64-core machine, the performance was divided by 8 between 32 and 64 H2 connections only because there were not enough entries in the local caches to avoid picking from the global pools, and the contention on the list there was very high. It becomes obvious that we need to have an array of lists, but that will require more changes. In parallel, standard memory allocators have improved, with tcmalloc and jemalloc finding their ways through mainstream systems, and glibc having upgraded to a thread-aware ptmalloc variant, keeping this level of contention here isn't justified anymore when we have both the local per-thread pool caches and a fast process-wide allocator. For these reasons, this patch introduces a new compile time setting CONFIG_HAP_NO_GLOBAL_POOLS which is set by default when threads are enabled with thread local pool caches, and we know we have a fast thread-aware memory allocator (currently set for glibc>=2.26). In this case we entirely bypass the global pool and directly use the standard memory allocator when missing objects from the local pools. It is also possible to force it at compile time when a good allocator is used with another setup. It is still possible to re-enable the global pools using CONFIG_HAP_GLOBAL_POOLS, if a corner case is discovered regarding the operating system's default allocator, or when building with a recent libc but a different allocator which provides other benefits but does not scale well with threads. |
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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)