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46690c9ec0
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 ```