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by 8jy89hui
1322 days ago
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The kernel is forced to zero memory that is allocated with mmap. This is very expensive and it is better to use sbrk and re-use allocated memory when possible. As such, the glibc malloc uses a sliding threshold to ensure that large long-lived allocations are mmaped whereas short allocations live inside "arenas" which are basically giant doubly linked lists that can expand with sbrk. |
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