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403bfbb130
As reported in issue #335, a lot of contention happens on the PATLRU lock when performing expensive regex lookups. This is absurd since the purpose of the LRU cache was to have a fast cache for expressions, thus the cache must not be shared between threads and must remain lockless. This commit makes the LRU cache thread-local and gets rid of the PATLRU lock. A test with 7 threads on 4 cores climbed from 67kH/s to 369kH/s, or a scalability factor of 5.5. Given the huge performance difference and the regression caused to users migrating from processes to threads, this should be backported at least to 2.0. Thanks to Brian Diekelman for his detailed report about this regression.
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)