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a7536ef9e1
As previously mentioned, this function currently holds an exclusive lock on the table during all the time it take to check if the entry needs to be updated and synchronized with peers. The reality is that many setups do not use peers and that on highly loaded setups, the same entries are hammered all the time so the key's expiration doesn't change between a number of consecutive accesses. With this patch we take a different approach. The function starts without taking the lock, and will take it only if needed, keeping track of it. This way we can avoid it most of the time, or even entirely. Finally if the decrefcnt argument requires that the refcount is decremented, we either do it using a non-atomic op if the table was locked (since no other entry may touch it) or via an atomic under the read lock only. With this change alone, a 48-thread test with 3 trackers increased from 193k req/s to 425k req/s, which is a 2.2x factor.
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)