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What is used in single-machine scheduling?
Single-machine scheduling with deadlines is NP-hard; Sahni presents both exact exponential-time algorithms and a polynomial-time approximation algorithm. Jobs can have execution intervals. For each job j, there is a processing time tj and a start-time sj, so it must be executed in the interval [sj, sj+tj].
What is parallel machine scheduling problem?
Parallel task scheduling (also called parallel job scheduling or parallel processing scheduling) is an optimization problem in computer science and operations research. It is a variant of optimal job scheduling. In the specific variant known as parallel-task scheduling, all machines are identical.
What is LPT scheduling?
From Encyclopedia of Mathematics. largest-processing-time-first sequencing. A sequencing rule in scheduling theory that prioritizes jobs (or tasks) to be scheduled according to an order of their non-increasing processing times.
What is the EDD rule?
EDD (Earliest Due Date). EDD sequencing rule is that “jobs are processed according to the due date, earliest due date first.”
What is shortest processing time rule?
Shortest processing time rule would require the job with the shortest processing time to be processed ahead of all other waiting jobs. The use of this rule for sequencing will minimize the average time a job spends at the workcenter (waiting time plus processing time), which is called average time in the system.
What is chunk scheduling?
1 Static or Chunk Scheduling. It is beneficial to divide the work evenly among the different threads on the system when the work performed by different iterations of a loop is the same. Under static or chunk scheduling, each thread will get the same number of iterations. …
What is LPT rule?
We revisit the famous Longest Processing Time (LPT) rule proposed by Graham in 1969. LPT requires to sort jobs in non-ascending order of processing times and then to assign one job at a time to the machine whose load is smallest so far.