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RandomCachePolicy.m
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RandomCachePolicy.m
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function [rs] = RandomCachePolicy(index,hasCached,ServerMemory,TaskMemory,Tasknum)
%为边缘服务器index随机选择一个满足条件的缓存策略
%hasCached(i) == 1表示任务i被其他边缘服务器缓存了
%ServerMemory(index)表示该边缘服务器的内存大小
%TaskMemory(i)表示缓存第i种类型任务所需的内存大小
rs = zeros(1,Tasknum);
memorySize = ServerMemory(index);%剩余内存容量
hasVisited = hasCached;
count=0;%统计已经被缓存了的任务数量
for i=1:Tasknum
if(hasCached(i) == 1)
count = count+1;
end
end
while count < Tasknum
taskId = randi(Tasknum,1,1);%随机选择一个任务
if(hasVisited(taskId) == 1) %选到已经尝试过,或者被其他服务器缓存了的任务,就continue
continue;
end
flag = randi(2,1,1); %生成一个1~2的均匀分布随机数,如果为1,表示准备缓存,如果是2,就不缓存了
if(flag == 1) %想要缓存,但是还得看看内存还够不够
if(memorySize >= TaskMemory(taskId))
rs(taskId) = 1;
memorySize = memorySize - TaskMemory(taskId);
end
end
%不管缓不缓存,第taskId这个任务已经尝试过了
hasVisited(taskId) = 1;
count = count + 1;
end
end
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