Lockup times

Resources are used to model assets or on a more general level to model every unit on which time consuming or quantity producing operations can be performed. Quants are assigned to resources and have executing times and costs on resources. A shift model and also lockup times can be assigned to a resource. 

Shift models and lockup times Every shift may have a performance factor f that changes an execution time T of a quant to T/f. The shift model may change after a few weeks or months. Therefore after this time the shift model can be simplified to the availability factor that expresses how much percent of the time can be used for production. It is possible to specify if a quant is interruptible by a shift pause or a lockup. This may depend on the product that is produced by the quant. Using the maximum allowed break for a quant is also a technique to model multiple single resources as one multiple resource. 

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If your computer locks up, consider the possibility that your computer is not locked up. A FOR-NEXT loop that counts to a million takes a lot of time. So does POKEing a few thousand numbers into memory. And it s possible to write an inefficient sorting routine that takes hour, even days, to complete. In cases like these, you might want to demonstrate that there s no lockup by printing to the screen or changing border color once in a while. 

To use ASD, go to Start > Run, type ASD, and click OK. This will bring up the ASD utility (Figure 19.8). From this screen, you can see which tasks failed to respond. If you check a box next to a particular task, the next time you boot Windows, that task won t load. In this way, ASD can prevent lockups during boot. 

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