161·
2 days agoThe value of this tunable is the minimum size (in bytes) of the top-most, releasable chunk in an arena that will trigger a system call in order to return memory to the system from that arena.
https://www.gnu.org/software/libc/manual/html_node/Memory-Allocation-Tunables.html
MALLOC_MMAP_THRESHOLD_ is an environment variable that sets the size threshold for using the mmap system call to allocate memory instead of using the heap.
- Default: 128 KiB
- Behavior:
- If a memory request is ≥ 128 KiB,
mmapis used. - If < 128 KiB, the heap is used.
- If a memory request is ≥ 128 KiB,
- Purpose:
- Helps manage large memory allocations more efficiently.
- Can be adjusted to optimize performance for specific applications.
deleted by creator