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School/Analyse/Periode 2/Week 1.md
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@ -59,13 +59,24 @@ when program issues IO command, cpu is granted to the next program.
**Parallel**: If the computer has multiple CPU's or Cores, the programs run in parallel. -> **Physically simultaneous** **Parallel**: If the computer has multiple CPU's or Cores, the programs run in parallel. -> **Physically simultaneous**
![[conc-parallel.png]]
# Sharing Resources # Sharing Resources
Sometimes diffrent programs (or same program) may share resources. Sometimes different programs (or same program) may share resources.
If data is **sequentially** accessible, programs should take turns accessing resource/data. If data is **sequentially** accessible, programs should take turns accessing resource/data.
Fast shared resource access can create **concurrent** access. Fast shared resource access can create **concurrent** access.
# Concurrency
Unlike parallelism, concurrency is not always about running faster.
- Single cpu/core computers may also use concurrency.
Useful for:
- App responsiveness.
- Processor utilization (hide IO time)
- Failure isolation

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