Student version ch2 section 1 - pdf

21 21 process parameters design capacity maximum rate

This preview shows page 21 - 27 out of 27 pages.

21 21 Process Parameters: Design Capacity : Maximum rate of transaction processing. (Design) Cycle Time = 1/( capacity). Minimum T hrough p ut T ime ( TPT ) How fast a transaction goes through the process when the process is empty. Run time Input Rate : transaction arrival rate Output Rate : Current rate of processing Actual Cycle Time = 1 / (output rate) Average TPT : Avg. time for a transaction to go through a stable process. Average WIP : Avg. number of transactions in the process . Design parameters indicate what a process can achieve. Run time parameters indicate what the current values are for a specific schedule. These values change with the schedule.
Image of page 21

Subscribe to view the full document.

22 Run Time parameters Design parameters Example. 3: Process Parameters for a Single Machine M1 4 min (15 units/ hour) Part A: A new component is scheduled every 4 minutes M1 Job 1 4 Job 3 12 Job 4 16 Job 2 8 Input rate Output rate Actual CT AverageTPT WIP = _________________________________ = __________________________________ = __________________________________ = _______ = _____________________________ Cycle time = Capacity = Minimum TPT = _________ _______________________________________ _________ Gantt Chart
Image of page 22
23 Run Time parameters Example 3 continued M1 4 min Input rate Output rate Actual CT TPT WIP Gantt Chart Part B: A new component is scheduled every 10 minutes M1 Job 2 10 14 Job 1 4 = ________________________________ = ________________________________ = ___________________________________ = _________ = ________________________ Run Time parameters depend on schedule! Input rate = output rate IF process is stable.
Image of page 23

Subscribe to view the full document.