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This gives us a 24 bytes size class which is dict.c dictEntry size, thus improving the memory efficiency of Redis significantly. Moreover other non 16 bytes aligned tiny classes are added that further reduce the fragmentation of the allocator. Technically speaking LG_QUANTUM should be 4 on i386 / AMD64 because of SSE types and other 16 bytes types, however we don't use those, and our jemalloc only targets Redis. New versions of Jemalloc will have an explicit configure switch in order to specify the quantum value for a platform without requiring any change to the Jemalloc source code: we'll switch to this system when available. This change was originally proposed by Oran Agra (@oranagra) as a change to the Jemalloc script to generate the size classes define. We ended doing it differently by changing LG_QUANTUM since it is apparently the supported Jemalloc method to obtain a 24 bytes size class, moreover it also provides us other potentially useful size classes. Related to issue #2510. |
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| autogen.sh | ||
| ChangeLog | ||
| config.guess | ||
| config.stamp.in | ||
| config.sub | ||
| configure | ||
| configure.ac | ||
| COPYING | ||
| coverage.sh | ||
| INSTALL | ||
| install-sh | ||
| Makefile.in | ||
| README | ||
| VERSION | ||
jemalloc is a general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. jemalloc first came into use as the FreeBSD libc allocator in 2005, and since then it has found its way into numerous applications that rely on its predictable behavior. In 2010 jemalloc development efforts broadened to include developer support features such as heap profiling, Valgrind integration, and extensive monitoring/tuning hooks. Modern jemalloc releases continue to be integrated back into FreeBSD, and therefore versatility remains critical. Ongoing development efforts trend toward making jemalloc among the best allocators for a broad range of demanding applications, and eliminating/mitigating weaknesses that have practical repercussions for real world applications. The COPYING file contains copyright and licensing information. The INSTALL file contains information on how to configure, build, and install jemalloc. The ChangeLog file contains a brief summary of changes for each release. URL: http://www.canonware.com/jemalloc/