📅  最后修改于: 2023-12-03 14:54:46.698000             🧑  作者: Mango
最差分配(Worst Fit)是一种内存分配算法,它选择能够容纳当前进程大小且空闲空间最大的内存块进行分配。它与最佳适配(Best Fit)相反,最佳适配是选择能够容纳当前进程大小且空闲空间最小的内存块进行分配。
最差分配算法适用于如下场景:
def worst_fit(num_processes, process_size, num_blocks, block_size):
allocation = [-1] * num_processes
for i in range(num_processes):
j = -1
for k in range(num_blocks):
if block_size[k] >= process_size[i] and allocation[k] == -1:
if j == -1:
j = k
elif block_size[j] < block_size[k]:
j = k
if j != -1:
allocation[j] = i
print("Process No.\tProcess Size\tBlock no.")
for i in range(num_processes):
print(i + 1, "\t\t", process_size[i], end="\t\t")
if allocation[i] != -1:
print(allocation[i] + 1)
else:
print("Not Allocated")
process_size = [212, 417, 112, 426]
block_size = [100, 500, 200, 300, 600]
worst_fit(len(process_size), process_size, len(block_size), block_size)
该示例代码演示了最差分配算法在Python中的实现。给定了进程大小和可用内存块大小,程序将选择能够容纳每个进程的空闲块,并将其分配到该块中。如果没有可用的空闲块,则会将该进程标记为未分配。