Real time system is defined as a system in which job has deadline, job has to finished by the deadline (strictly finished). If a result is delayed, huge loss may happen.
1. Hard Real Time System :
Hard real time is a system whose operation is incorrect whose result is not produce according to time constraint.
1. Air Traffic Control 2. Medical System
2. Soft Real Time System :
Soft real time system is a system whose operation is degrade if results are not produce according to the specified timing requirement.
For example1. Multimedia Transmission and Reception 2. Computer Games
Difference between Hard real time and Soft real time system :
|HARD REAL TIME SYSTEM||SOFT REAL TIME SYSTEM|
|In hard real time system, the size of data file is small or medium.||In soft real time system, the size of data file is large.|
|In this system response time is in millisecond.||In this system response time are higher.|
|Peak load performance should be predictable.||In soft real time system, peak load can be tolerated.|
|In this system safety is critical.||In this system safety is not critical.|
|A hard real time system is very restrictive.||A Soft real time system is less restrictive.|
|In case of an error in a hard real time system, the computation is rolled back.||In case of an soft real time system, computation is rolled back to previously established a checkpoint.|
|Satellite launch, Railway signaling system etc.||DVD player, telephone switches, electronic games etc.|
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