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Random Notes

Heap

Heap is allocated with mmap and is aligned to HEAP_MAX_SIZE, defined to be 2 * DEFAULT_MMAP_THRESHOLD_MAX. DEFAULT_MMAP_THRESHOLD_MAX is 4*1024*1024*sizeof(long) on 64-bit systems, which is 0x2000000, so the per-thread heap that's mmap'd will always be aligned to 0x4000000.