include <jemalloc/jemalloc.h>
int mallctl(const char *name, void *oldp, size_t *oldlenp, void *newp, size_t *newlen);
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mallctl("arenas.create", &new_arena, &new_len, NULL, 0);
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mallctl(arena_decay.c_str(), &old_decay, &old_len, &arena_decay_ms, sizeof(arena_decay_ms));
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mallctl("thread.arena", &old_arena, &old_len, &new_arena, sizeof(new_arena));
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