管理系统"/>
Python简单模拟分页存储管理系统
要求：
- 定义分页的地址结构和页表结构。
- 对进程的逻辑地址空间、页表起址、给定的逻辑地址进行初始化。
- 实现从逻辑地址到物理地址的变换。
- 实现“主存空间的共享和保护”功能。
- 实现“主存扩充”虚拟功能。
import random import sys ''' nei:主存容量 wai:外存容量 b:页面大小 c:页面数 d:页表 k:逻辑地址 f:物理地址 occupy:已用物理块 '''def aaa(nei, wai, b, c):# 已占内存occupy1 = []hh1 = []for i in range((nei // (b * 2) - 4)):hh = random.randint(0, nei // b)while hh in hh1:hh = random.randint(0, nei // b)hh1.append(hh)occupy1.append(hh)# 占用大量内存occupy3 = []hh3 = []for i in range((nei // b - 4)):hh = random.randint(0, nei // b)while hh in hh3:hh = random.randint(0, nei // b)hh3.append(hh)occupy3.append(hh)# 已占外存occupy2 = []hh2 = []for i in range(wai // (3 * b)):hh = random.randint(0, wai // b)while hh in hh2:hh = random.randint(0, wai // b)hh2.append(hh)occupy2.append(hh)hhh = eval(input("请选择需不需要内存扩充: 1 需要 2 不需要: "))# 设置页表并进行初始化d = {} # 页表，包含页号，物理块号，状态位，访问字段A,修改位M,外存地址d1 = [] # 用来存放已有内存物理块号d2 = [] # 用来存放已有外存物理块号dd = [] # 用来存放页表中除页号的所有信息if hhh == 2:ff = (nei // b) - len(occupy1)if c <= ff:for i in range(c):j1 = random.randint(0, nei // b)j2 = random.randint(0, wai // b)while j1 in d1 or j1 in occupy1:j1 = random.randint(0, nei // b)while j2 in d2 or j2 in occupy2:j2 = random.randint(0, nei // b)d1.append(j1)d2.append(j2)occupy2.append(j2)dd.append(j1) # 将内存物理块号放入dddd += [0, 0, 0] # 设置状态位P为0，访问字段A为0，修改位M为0dd.append(j2) # 将外存物理块号放入dddd.append(0) # 共享状态，1共享d[i] = dddd = []for i in range(c // 2): # 将一半页表放入内存d[i][1] = 1occupy1.append(d[i][0])occupy2.remove(d[i][4])for i in range(c // 2, (c // 2) + 2):d[i][3] = 1for i in range(c // 2):x = random.randint(0, c-1)d[x][5] = 1print("页表为: ")print("页号 物理块号 状态位 访问字段 修改位 外存地址 共享状态")for i in range(c):print(" {0:>0} {1:>4} {2:>5} {3:>7}{4:>9}{5:>12}{6:>13}".format(i, d[i][0], d[i][1], d[i][2], d[i][3], d[i][4], d[i][5]))# 设置逻辑地址并将其转化成物理地址k = input("请输入逻辑地址(可十进制输入或十六进制输入):")if "0" <= k[-1] <= "9" or k[-1] == "H" or k[-1] == "h":n = []e = 0if k[-1] == "H" or k[-1] == "h":j = {"a": 10, "A": 10, "b": 11, "B": 11, "c": 12, "C": 12, "d": 13, "D": 13, "e": 14, "E": 14, "f": 15, "F": 15}for i in range(len(k)-1):if k[i] in j.keys():n.append(j[k[i]])else:n.append(eval(k[i][0]))for i in range(len(n)):e += n[i] * (16 ** (len(n)-1-i))else:e = eval(k)page = e // b # 页号offest = e % b # 页内偏移量if page >= c:print("产生越界中断: ")sys.exit() # 终止程序if d[page][1] == 0: # 判断该页在不在内存，1在，0不在print("缺的页: ", d[page])if d[page][0: 5] == [0, 0, 0, 0, 0] or d[page][0: 5] == [0, 0, 0, 1, 0]: # 判断内存满否,此时内存满print("内存已满，选择一页置换出!")x = random.randint(0, len(occupy1)-1) # 内存满时选择一页换出if d[page][3] == 1: # 判断该页是否修改，0为否，1为是print("该页已被修改，将重新写入外存")j2 = random.randint(0, wai // b)while j2 in d2 or j2 in occupy2:j2 = random.randint(0, nei // b)d[page][4] = j2d[page][3] = 0print("将该页写入外存后为:{0}:{1}".format(page, d[page]))d[page][0] = occupy1[x] # 设置缺页的物理块为从外存置换出的print("置换的物理地址为: ", occupy1[x])d[page][1] = 1 # 将该页从外存换入内存physical = d[page][0] # 对应的物理块号f = hex(physical * b + offest) # 物理地址f = list(f)del f[:2]f.append("h")f = "".join(f)print("逻辑地址页号为{},页内偏移为{}".format(page, offest))print("{}对应的物理地址为:{}".format(k, f))else:physical = d[page][0] # 对应的物理块号f = hex(physical * b + offest) # 物理地址f = list(f)del f[:2]f.append("h")f = "".join(f)print("逻辑地址页号为{},页内偏移为{}".format(page, offest))print("{}对应的物理地址为:{}".format(k, f))else:print("输入错误!")sys.exit()elif hhh == 1:ff = (nei // b) - len(occupy3)if c <= ff:for i in range(c):j1 = random.randint(0, nei // b)j2 = random.randint(0, wai // b)while j1 in d1 or j1 in occupy3:j1 = random.randint(0, nei // b)while j2 in d2 or j2 in occupy2:j2 = random.randint(0, nei // b)d1.append(j1)d2.append(j2)occupy2.append(j2)dd.append(j1) # 将内存物理块号放入dddd += [0, 0, 0] # 设置状态位P为0，访问字段A为0，修改位M为0dd.append(j2) # 将外存物理块号放入dddd.append(0) # 共享状态，1共享d[i] = dddd = []for i in range(c // 2): # 将一半页表放入内存d[i][1] = 1occupy3.append(d[i][0])occupy2.remove(d[i][4])for i in range(c // 2, (c // 2) + 2):d[i][3] = 1else:for i in range(ff):j1 = random.randint(0, nei // b)j2 = random.randint(0, wai // b)while j1 in d1 or j1 in occupy3:j1 = random.randint(0, nei // b)while j2 in d2 or j2 in occupy2:j2 = random.randint(0, nei // b)d1.append(j1)d2.append(j2)occupy2.append(j2)dd.append(j1) # 将内存物理块号放入dddd += [0, 0, 0] # 设置状态位P为0，访问字段A为0，修改位M为0dd.append(j2) # 将外存物理块号放入dddd.append(0)d[i] = dddd = []for i in range(ff, c): # 内存满时剩余的页表表示d[i] = [0, 0, 0, 0, 0, 0]d[c-2] = [0, 0, 0, 1, 0, 0] # 选一个页修改位置1for i in range(ff // 2): # 将一半页表放入内存d[i][1] = 1occupy3.append(d[i][0])occupy2.remove(d[i][4])for i in range(ff // 2, (ff // 2) + 2):d[i][3] = 1d[1][5] = 1print("页表为: ")print("页号 物理块号 状态位 访问字段 修改位 外存地址 共享状态")for i in range(c):print(" {0:>0} {1:>4} {2:>5} {3:>7}{4:>9}{5:>12}{6:>13}".format(i, d[i][0], d[i][1], d[i][2], d[i][3], d[i][4], d[i][5]))# 设置逻辑地址并将其转化成物理地址k = input("请输入逻辑地址(可十进制输入或十六进制输入):")if "0" <= k[-1] <= "9" or k[-1] == "H" or k[-1] == "h":n = []e = 0if k[-1] == "H" or k[-1] == "h":j = {"a": 10, "A": 10, "b": 11, "B": 11, "c": 12, "C": 12, "d": 13, "D": 13, "e": 14, "E": 14, "f": 15, "F": 15}for i in range(len(k)-1):if k[i] in j.keys():n.append(j[k[i]])else:n.append(eval(k[i][0]))for i in range(len(n)):e += n[i] * (16 ** (len(n)-1-i))else:e = eval(k)page = e // b # 页号offest = e % b # 页内偏移量if page >= c:print("产生越界中断: ")sys.exit() # 终止程序if d[page][1] == 0: # 判断该页在不在内存，1在，0不在print("缺的页: ", d[page])if d[page][0: 5] == [0, 0, 0, 0, 0] or d[page][0: 5] == [0, 0, 0, 1, 0]: # 判断内存满否,此时内存满print("内存已满，选择一页置换出!")x = random.randint(0, len(occupy3)-1) # 内存满时选择一页换出if d[page][3] == 1: # 判断该页是否修改，0为否，1为是print("该页已被修改，将重新写入外存")j2 = random.randint(0, wai // b)while j2 in d2 or j2 in occupy2:j2 = random.randint(0, nei // b)d[page][4] = j2d[page][3] = 0print("将该页写入外存后为:{0}:{1}".format(page, d[page]))d[page][0] = occupy3[x] # 设置缺页的物理块为从外存置换出的print("置换的物理地址为: ", occupy3[x])d[page][1] = 1 # 将该页从外存换入内存physical = d[page][0] # 对应的物理块号f = hex(physical * b + offest) # 物理地址f = list(f)del f[:2]f.append("h")f = "".join(f)print("逻辑地址页号为{},页内偏移为{}".format(page, offest))print("{}对应的物理地址为:{}".format(k, f))else:physical = d[page][0] # 对应的物理块号f = hex(physical * b + offest) # 物理地址f = list(f)del f[:2]f.append("h")f = "".join(f)print("逻辑地址页号为{},页内偏移为{}".format(page, offest))print("{}对应的物理地址为:{}".format(k, f))else:print("输入错误!")sys.exit()else:print("输入错误!")sys.exit()# 输出共享页表gongxiang = {}for i in range(c):if d[i][5] == 1:gongxiang[i] = d[i]gongxiang[i].append(random.randint(1, 5))print("共享的页表为:")print("页号 物理块号 状态位 访问字段 修改位 外存地址 共享状态 共享进程计数")for i in gongxiang.keys():print(" {0:>0} {1:>4} {2:>5} {3:>7}{4:>9}{5:>11}{6:>12}{7:>13}".format(i, gongxiang[i][0], gongxiang[i][1], gongxiang[i][2], gongxiang[i][3], gongxiang[i][4], gongxiang[i][5], gongxiang[i][6]))if page in gongxiang.keys():gongxiang[page][6] += 1print("此时的共享的页表为:")print("页号 物理块号 状态位 访问字段 修改位 外存地址 共享状态 共享进程计数")for i in gongxiang.keys():print(" {0:>0} {1:>4} {2:>5} {3:>7}{4:>9}{5:>11}{6:>12}{7:>13}".format(i, gongxiang[i][0], gongxiang[i][1], gongxiang[i][2], gongxiang[i][3], gongxiang[i][4], gongxiang[i][5], gongxiang[i][6]))print("随机结束几个进程")aaa = list(gongxiang.keys())for i in range(random.randint(1, 10)):aaa1 = aaa[random.randint(0, len(aaa)-1)]gongxiang[aaa1][6] -= 1for i in aaa:if gongxiang[i][6] <= 0:gongxiang.pop(i)print("此时的共享的页表为:")print("页号 物理块号 状态位 访问字段 修改位 外存地址 共享状态 共享进程计数")for i in gongxiang.keys():print(" {0:>0} {1:>4} {2:>5} {3:>7}{4:>9}{5:>11}{6:>12}{7:>13}".format(i, gongxiang[i][0], gongxiang[i][1], gongxiang[i][2], gongxiang[i][3], gongxiang[i][4], gongxiang[i][5], gongxiang[i][6]))# 定义主存容量 i = input("请输入主存容量(单位b，kb，mb): ") if i[-2:] == "MB" or i[-2:] == "mb" or i[-2:] == "mB" or i[-2:] == "Mb":nei = eval(i[:-2]) * (2 ** 20) elif i[-2:] == "KB" or i[-2:] == "kb" or i[-2:] == "kB" or i[-2:] == "Kb":nei = eval(i[:-2]) * (2 ** 10) elif i[-1] == "B" or i[-1] == "b":nei = eval(i[:-1]) elif i.isnumeric():nei = eval(i) else:print("输入错误!")sys.exit() print("主存容量为:", nei, "b")# 定义外存容量 i = input("请输入外存容量(单位b，kb，mb): ") if i[-2:] == "MB" or i[-2:] == "mb" or i[-2:] == "mB" or i[-2:] == "Mb":wai = eval(i[:-2]) * (2 ** 20) elif i[-2:] == "KB" or i[-2:] == "kb" or i[-2:] == "kB" or i[-2:] == "Kb":wai = eval(i[:-2]) * (2 ** 10) elif i[-1] == "B" or i[-1] == "b":wai = eval(i[:-1]) elif i.isnumeric():wai = eval(i) else:print("输入错误!")sys.exit() print("外存容量为:", wai, "b")# 定义页面大小 i = input("请输入页面大小(单位b，kb，mb): ") if i[-2:] == "MB" or i[-2:] == "mb" or i[-2:] == "mB" or i[-2:] == "Mb":b = eval(i[:-2]) * (2 ** 20) elif i[-2:] == "KB" or i[-2:] == "kb" or i[-2:] == "kB" or i[-2:] == "Kb":b = eval(i[:-2]) * (2 ** 10) elif i[-1] == "B" or i[-1] == "b":b = eval(i[:-1]) elif i.isnumeric():b = eval(i) else:print("输入错误!")sys.exit() print("页面大小为:", b, "b")# 定义页数 i = input("请输入页数(单位b，kb，mb): ") if i[-2:] == "MB" or i[-2:] == "mb" or i[-2:] == "mB" or i[-2:] == "Mb":c = eval(i[:-2]) * (2 ** 20) elif i[-2:] == "KB" or i[-2:] == "kb" or i[-2:] == "kB" or i[-2:] == "Kb":c = eval(i[:-2]) * (2 ** 10) elif i[-1] == "B" or i[-1] == "b":c = eval(i[:-1]) elif i.isnumeric():c = eval(i) else:print("输入错误!")sys.exit() print("页面大小为:", c, "b") hf = "y" while hf == "y" or hf == "Y":aaa(nei, wai, b, c)hf = input("是否继续，是输入y，否n: ") sys.exit()
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Python简单模拟分页存储管理系统
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