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On many threads and without the shared cache, there can be extreme contention on the ->allocated counter, the ->free_list pointer, and the ->used counter. It's possible to limit this contention by spreading the counters a little bit over multiple entries, that are summed up when a consultation is needed. The criterion used to spread the values cannot be related to the thread ID due to migrations, since we need to keep consistent stats (allocated vs used). Instead we'll just hash the pointer, it provides an index that does the job and that is consistent for the object. When having just a few entries (16 here as it showed almost identical performance between global and non-global pools) even iterations should be short enough during measurements to not be a problem. A pair of functions designed to ease pointer hash bucket calculation were added, with one of them doing it for thread IDs because allocation failures will be associated with a thread and not a pointer. For now this patch only brings in the relevant parts of the infrastructure, the CONFIG_HAP_POOL_BUCKETS_BITS macro that defaults to 6 bits when 512 threads or more are supported, 5 bits when 128 or more are supported, 4 bits when 16 or more are supported, otherwise 3 bits for small setups. The array in the pool_head and the two utility functions are already added. It should have no measurable impact beyond inflating the pool_head structure. |
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| INSTALL | ||
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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)