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Specify the maximum number of regions in a slab, which is (<lg-page> - <lg-tiny-min>) by default. This increases the limit of slab sizes specified by "slab_sizes" in malloc_conf. This should never be less than the default value. The max value of this option is related to LG_BITMAP_MAXBITS (see more in bitmap.h). For example, on a 4k page size system, if we: 1) configure jemalloc with with --with-lg-slab-maxregs=12. 2) export MALLOC_CONF="slab_sizes:9-16:4" The slab size of 16 bytes is set to 4 pages. Previously, the default lg-slab-maxregs is 9 (i.e. 12 - 3). The max slab size of 16 bytes is 2 pages (i.e. (1<<9) * 16 bytes). By increasing the value from 9 to 12, the max slab size can be set by MALLOC_CONF is 16 pages (i.e. (1<<12) * 16 bytes).
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 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://jemalloc.net/