首次,最佳和最坏适应算法代码
时间: 2023-10-02 19:08:18 浏览: 36
最佳适应算法:
```python
def best_fit(block_sizes, process_sizes):
# 对块和进程大小进行排序
block_sizes.sort(reverse=True)
process_sizes.sort(reverse=True)
# 创建块和进程的分配字典,初始为空
allocation = {}
# 遍历所有进程
for process in process_sizes:
# 初始化最小空闲块大小为无穷大
best_block_size = float("inf")
best_block_index = -1
# 在所有块中查找最小空闲块大小
for i, block in enumerate(block_sizes):
# 如果块大小大于等于进程大小,并且比当前最小空闲块大小更接近进程大小,则更新最小空闲块大小和索引
if block >= process and block - process < best_block_size:
best_block_size = block - process
best_block_index = i
# 如果找到可用块,则进行分配
if best_block_index != -1:
allocation[process] = block_sizes[best_block_index]
del block_sizes[best_block_index]
return allocation
```
最坏适应算法:
```python
def worst_fit(block_sizes, process_sizes):
# 对块和进程大小进行排序
block_sizes.sort(reverse=True)
process_sizes.sort(reverse=True)
# 创建块和进程的分配字典,初始为空
allocation = {}
# 遍历所有进程
for process in process_sizes:
# 初始化最大空闲块大小为负无穷大
worst_block_size = float("-inf")
worst_block_index = -1
# 在所有块中查找最大空闲块大小
for i, block in enumerate(block_sizes):
# 如果块大小大于等于进程大小,并且比当前最大空闲块大小更大,则更新最大空闲块大小和索引
if block >= process and block - process > worst_block_size:
worst_block_size = block - process
worst_block_index = i
# 如果找到可用块,则进行分配
if worst_block_index != -1:
allocation[process] = block_sizes[worst_block_index]
del block_sizes[worst_block_index]
return allocation
```
最差适应算法:
```python
def first_fit(block_sizes, process_sizes):
# 创建块和进程的分配字典,初始为空
allocation = {}
# 遍历所有进程
for process in process_sizes:
# 从第一个块开始查找可用块
for i, block in enumerate(block_sizes):
# 如果块大小大于等于进程大小,则进行分配
if block >= process:
allocation[process] = block
del block_sizes[i]
break
return allocation
```