Optimization Quiz

Test understanding of block optimization

Get every question correct to pass this checkpoint. You can review feedback, revise your answers, and submit again.

1. Payload capacity is 128, header 24, alignment 8, request 41. If split, what is the remainder payload capacity?

Select one answer.

56 80 63 104

2. Capacity 80, aligned request 40, header 24, minimum remainder payload 16. Is the split valid?

Select one answer.

No; equality at the threshold is always forbidden Yes; the remainder has 40 payload bytes No; block sizes must all be powers of two Yes; the remainder has exactly 16 payload bytes

3. A custom aligned allocator returns an interior address and stores its original allocation immediately before it. How must its paired free work?

Select one answer.

Pass the interior address directly to ordinary free Free the address of the saved-pointer slot Lower the program break by the alignment Recover and free the original allocation pointer

4. Rounding byte address 4101 upward to a 16-byte boundary yields what decimal address?

5. A raw allocation begins at decimal address 2024. With an eight-byte saved pointer and 32-byte alignment, what payload address is returned? Enter a decimal integer.

6. With a toy SIZE_MAX of 255, a request has size 232, alignment 16, and an eight-byte pointer slot. The 255-byte reservation fits. If the base allocator must round it to eight bytes, what must happen? Select one.

Select one answer.

Reject before any allocation or list mutation, because rounding requires 256 Allocate zero bytes because the rounded sum wraps to zero Skip the saved-pointer slot to make the request fit Allocate 248 bytes and return an aligned address anyway

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