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Back of the Envelope Estimation

Back of the Envelope Estimation. Principles. Work does not compress A bad estimate is better than none. Use Queuing Theory Look at the resources. Quantities. Time CPU seconds of processes and functions Code size Instruction path lengths Real time/Response time Support time

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Back of the Envelope Estimation

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  1. Back of the Envelope Estimation

  2. Principles • Work does not compress • A bad estimate is better than none. • Use Queuing Theory • Look at the resources

  3. Quantities • Time • CPU seconds of processes and functions • Code size • Instruction path lengths • Real time/Response time • Support time • Back up, batch audits, admin duties

  4. Quantities (cont.) • Memory • Text, data, bss, stack, heap of a process • Shared memory • System resources • Message queues • Buffers • System tables

  5. Quantities (cont.) • I/O • Bandwidth of channels • Number of concurrent I/O ops • Data Size • Disk speed

  6. Quantities (cont.) • Messages • Quantity per unit time • Distribution over type, priority, time, etc. • Transit time in the system

  7. Estimation

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