A Decentralized Virtual Machine Migration Approach of Data Centers for Cloud Computing

Algorithm 2

Function findDest(vmToMig).

(1) calculate the utilization of vmToMig as vmutil

(2) double minUtil=1.0;

(3) int bestTarget=−1;

(4) for each (li in LoadVector)

(5) { if  (vmutil + li.util >=LT

(6)       && vmutil + li.util <= UT)

(7)   { if  (li.util < minUtil)

(8)     {

(9)    minUtil=li.util;

(10)       bestTarget=li.PNid;

(11)    }

(12)  }

(13) }

(14) if  (bestTarget >0) //find target successfully

(15) { vmToMig.dest=bestTarget;

(16)    return 0;

(17) }

(18) for each (li in LoadVector)

(19) {

(20)  if  (vmutil + li.util <=LT)

(21)  { vmToMig.dest=bestTarget;

(22)     return 0;

(23)  }

(24) }

(25) int getSleepNodeID=requireSleepNode();

(26) if (getSleepNodeID < 0) return −1;

(27) else

(28) { vmToMig.dest=getSleepNodeID;

(29)    return 0;

(30) }

(31) return −1;