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We are trying to create `ncpus * 2` threads for this test and place them into `VARIABLE_ARRAY`, but `VARIABLE_ARRAY` can not be more than `VARIABLE_ARRAY_SIZE_MAX` bytes. When there are a lot of threads on the box test always fails. ``` $ nproc 176 $ make -j`nproc` tests_unit && ./test/unit/retained <jemalloc>: ../test/unit/retained.c:123: Failed assertion: "sizeof(thd_t) * (nthreads) <= VARIABLE_ARRAY_SIZE_MAX" Aborted (core dumped) ``` There is no need for high concurrency for this test as we are only checking stats there and it's behaviour is quite stable regarding number of allocating threads. Limited number of threads to 16 to save compute resources (on CI for example) and reduce tests running time. Before the change (`nproc` is 80 on this box). ``` $ make -j`nproc` tests_unit && time ./test/unit/retained <...> real 0m0.372s user 0m14.236s sys 0m12.338s ``` After the change (same box). ``` $ make -j`nproc` tests_unit && time ./test/unit/retained <...> real 0m0.018s user 0m0.108s sys 0m0.068s ```
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: https://jemalloc.net/