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Latest commit 4bbcf52
Jan 25, 2016
(thx @jitheshtr for patch; squashed and commit message by @gstrauss) remove __builtin_prefetch() in mcdb_findtagnext() remove __builtin_expect() in mcdb_findtagnext() Removing prefetch improves performance by reducing use of limited memory bandwidth, especially upon mcdb key lookup misses. Removing the branch prediction hint, which was tuned for mcdb key lookup hits, allows the branch predictor to dynamically predict the branch, which can be beneficial for use cases such as when majority of mcdb key lookups are misses. Performance tests on laptops should note CPU power management settings. On Linux: To display CPU power management settings $ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor To change CPU power management settings (until next reboot) $ echo performance | \ tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor github: closes #8
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mcdb - fast, reliable, simple code to create and read constant databases README - summary (this file) INSTALL - quick installation COPYING - copyright/license NOTES - technical details (if interested) t/PERFORMANCE - performance notes mcdb (mmap constant database) is originally based on the cdb package, a: "fast, reliable, simple package for creating and reading constant databases." mcdb is almost 33% faster, provides support for use in threaded programs, and supports databases larger than 4 GB. nss_mcdb is an nss implementation of standard authentication and netdb files built as mcdb databases, which are faster than using nscd. https://github.com/gstrauss/mcdb/ provides the latest information about mcdb. http://cr.yp.to/cdb.html provides information about cdb, on which mcdb is based.