IOS 3 & 4 #2

True or False:
In the first fit algorithm, the memory allocator always starts scanning the free list from the beginning.

• True

• False

Answer explanation

The First Fit Algorithm is a memory allocation strategy where the system scans the free list and allocates the first hole it encounters that is large enough to satisfy the process's memory request. If the hole is significantly larger than the requested size, it is split, and the remainder is returned to the free list. First fit is efficient for quick allocations but may accumulate small unusable blocks near the beginning of the list, leading to fragmentation.

True or False:
First fit allocates memory to the smallest available hole that can satisfy the request.

• True

• False

Answer explanation

The First Fit Algorithm is a memory allocation strategy where the system scans the free list and allocates the first hole it encounters that is large enough to satisfy the process's memory request. If the hole is significantly larger than the requested size, it is split, and the remainder is returned to the free list. First fit is efficient for quick allocations but may accumulate small unusable blocks near the beginning of the list, leading to fragmentation.

True or False:
The first fit algorithm performs faster allocations compared to best fit.

• True

• False

Answer explanation

The First Fit Algorithm is a memory allocation strategy where the system scans the free list and allocates the first hole it encounters that is large enough to satisfy the process's memory request. If the hole is significantly larger than the requested size, it is split, and the remainder is returned to the free list. First fit is efficient for quick allocations but may accumulate small unusable blocks near the beginning of the list, leading to fragmentation.

True or False:
In the first fit algorithm, significantly larger blocks than the requested size are split, and the remaining portion is added back to the free list.

• True

• False

Answer explanation

The First Fit Algorithm is a memory allocation strategy where the system scans the free list and allocates the first hole it encounters that is large enough to satisfy the process's memory request. If the hole is significantly larger than the requested size, it is split, and the remainder is returned to the free list. First fit is efficient for quick allocations but may accumulate small unusable blocks near the beginning of the list, leading to fragmentation.

the allocator keeps a list of free blocks (known as the free list) and, on receiving a request for memory, scans along the list for the first block that is large enough to satisfy the request.

True or False: S
Small blocks tend to accumulate at the end of the free list in the first fit algorithm.

• True

• False

Answer explanation

The Next Fit Algorithm is a variation of the first fit algorithm. Instead of starting the search from the beginning of the free list every time, it resumes scanning from the position of the last allocation. This reduces repeated traversal of already-checked blocks but may result in slightly worse performance compared to first fit.

True or False:
The next fit algorithm starts scanning from where it left off during the previous allocation.

• True

• False

Answer explanation

The Next Fit Algorithm is a variation of the first fit algorithm. Instead of starting the search from the beginning of the free list every time, it resumes scanning from the position of the last allocation. This reduces repeated traversal of already-checked blocks but may result in slightly worse performance compared to first fit.

What does the first fit algorithm do when it encounters a hole large enough for the request?

• Allocates the last hole on the list

• Allocates the first hole large enough and splits it if necessary

• Skips the hole and searches for the best fit

• Allocates the smallest available hole

Answer explanation

The First Fit Algorithm is a memory allocation strategy where the system scans the free list and allocates the first hole it encounters that is large enough to satisfy the process's memory request. If the hole is significantly larger than the requested size, it is split, and the remainder is returned to the free list. First fit is efficient for quick allocations but may accumulate small unusable blocks near the beginning of the list, leading to fragmentation.

What happens to the remaining portion of a block if it is split in the first fit algorithm?

• It is discarded

• It is merged with the next hole

• It is added back to the free list as a separate block

• It is reallocated to the same process

Answer explanation

The First Fit Algorithm is a memory allocation strategy where the system scans the free list and allocates the first hole it encounters that is large enough to satisfy the process's memory request. If the hole is significantly larger than the requested size, it is split, and the remainder is returned to the free list. First fit is efficient for quick allocations but may accumulate small unusable blocks near the beginning of the list, leading to fragmentation.

Which algorithm starts searching the free list from the position it left off during the last allocation?

• Best fit

• First fit

• Next fit

• Worst fit

Answer explanation

The Next Fit Algorithm is a variation of the first fit algorithm. Instead of starting the search from the beginning of the free list every time, it resumes scanning from the position of the last allocation. This reduces repeated traversal of already-checked blocks but may result in slightly worse performance compared to first fit.

What problem is associated with the first fit algorithm?

• It results in unused memory outside partitions

• Small blocks accumulate near the beginning of the free list

• It cannot split large blocks

• It always starts scanning from the end of the free list

Answer explanation

The First Fit Algorithm is a memory allocation strategy where the system scans the free list and allocates the first hole it encounters that is large enough to satisfy the process's memory request. If the hole is significantly larger than the requested size, it is split, and the remainder is returned to the free list. First fit is efficient for quick allocations but may accumulate small unusable blocks near the beginning of the list, leading to fragmentation.