Queueing theory in software development - ALEBathtub 2011-06-30

Queueingtheoryinsoftware development,[object Object],Håkan Forss - hakan.forss@avegagroup.se - @hakanforss,[object Object]

What can traffic inteach you about yourdevelopment process,[object Object],Håkan Forss - hakan.forss@avegagroup.se - @hakanforss,[object Object]

Little’s Law,[object Object],Work-in-Process,[object Object],Throughput,[object Object],Cycle Time =,[object Object]

Little’s Law,[object Object],12,[object Object],12 / min,[object Object],1 min =,[object Object]

Little’s Law,[object Object],6,[object Object],12 / min,[object Object],0,5 min=,[object Object]

Little’s Law,[object Object],24,[object Object],12 / min,[object Object],2 min =,[object Object]

8 cars / min,[object Object],4 cars / min,[object Object],With less work-in-progress,[object Object],Shorter cycle time,[object Object],Faster feedback,[object Object],Makes problems visible faster,[object Object]

TheoryofConstraints,[object Object]

Don’t allow inertia to cause a system constraint.,[object Object]

Capacity = 4,[object Object],Capacity = 6,[object Object],Capacity = 6,[object Object],Throughput = 4,[object Object],Bottlenecks,[object Object],You can never go faster than your bottleneck,[object Object]

Bottlenecks,[object Object],Throughput = 2,[object Object],You can never go faster than your bottleneck,[object Object],Do whatever you can to make your bottleneck 100% utilized ,[object Object],Try your hardest to avoid problems at you bottleneck ,[object Object],You can’t make up for lost capacity at you bottleneck,[object Object]

Throughput = 4,[object Object],You can never go faster than your bottleneck,[object Object],As long as capacity in front of the bottleneck is equal to or grater than the bottleneck you will go as fast as your bottleneck,[object Object],Full use of a higher capacity in front of the bottleneck will make cycle time go up,[object Object],Bottlenecks,[object Object]

Bottlenecks,[object Object],Throughput = 4,[object Object],You can never go faster than your bottleneck,[object Object],As long as capacity is equal to or grater after the bottleneck you will go as fast as your bottleneck,[object Object],Higher capacity after the bottleneck than at the bottleneck will not improve throughput,[object Object]

Non-instantavailabilityresource,[object Object],A resource that is not available all the time,[object Object]

Non-instantavailabilityresource & bottleneck,[object Object]

You can never go faster than your bottleneck,[object Object],Balance demand against throughput to keep work-in-progress low,[object Object],Low work-in-progress,[object Object],Keeps cycle time down ,[object Object],Makes bottlenecks visible faster,[object Object]

Slow down to go faster ,[object Object],Slowing down can stabilize the process flow,[object Object],A stable process can go faster,[object Object]

Håkan Forss,[object Object],Mail: hakan.forss@avegagroup.se,[object Object],Twitter: @hakanforss,[object Object],Blog: http://hakanforss.wordpress.com/,[object Object]

Queueing theory in software development - ALEBathtub 2011-06-30

Queueing theory in software development - ALEBathtub 2011-06-30

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