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HAProxy - Load balancer
6be8d09a61
During multiple tests we've already noticed that shared stats counters have become a real bottleneck under large thread counts. With QUIC it's pretty visible, with qc_snd_buf() taking 2.5% of the CPU on a 48-thread machine at only 25 Gbps, and this CPU is entirely spent in the atomic increment of the byte count and byte rate. It's also visible in H1/H2 but slightly less since we're working with larger buffers, hence less frequent updates. These counters are exclusively used to report the byte count in "show info" and the byte rate in the stats. Let's move them to the thread_ctx struct and make the stats reader just collect each thread's stats when requested. That's way more efficient than competing on a single cache line. After this, qc_snd_buf has totally disappeared from the perf profile and tests made in h1 show roughly 1% performance increase on small objects. |
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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)