regarding optimum solution, we are implementing algorithm in workflowsim,
steps to find processing cost
random allocation start;
cost+=cloudlet.getProcessingCost(); // is this way right to find processing cost.
after getting processing cost, how we allocate solution from among solutions,
which has minimum cost.
Here is the Excel solver problem,
http://www.solver.com/excel-solver-solutions-feasible-good-and-optimal
https://www.topcoder.com/community/data-science/data-science-tutorials/minimum-cost-flow-part-three-applications/
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&ved=0ahUKEwi_nrWl9NnMAhUJej4KHaOYBUsQFghOMAY&url=http%3A%2F%2Fwww.cs.tau.ac.il%2F~haimk%2Fseminar-2013%2FMCFsimplex.pptx&usg=AFQjCNEy74JCWx2yrBPO3MUdw2C9udIwJA&sig2=Le2cpKTLumoCJcu6efrO7Q
I definitely recommend You usage of transportation problem including additional criteria like time lapse between operations in workflow or level of units queues. You can also combine transportation algorithm with any other, for example taken from queuing theory.
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