lec20_QosMana - 1 Chang-Gun Lee Seoul National University...

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Unformatted text preview: 1 Chang-Gun Lee Seoul National University QoS-Driven Optimal Resource Management Resource Assignment Problem • Resources: CPU, Bandwidth, etc. • Resource Assignment Problem: How much resource should be assigned to real-time tasks? – Always satisfy minimal timing constraints (or QoS) • Minimal resource assignment – Optimize QoS with left over resource • More resource Æ Better Quality 2 Quality vs. Resource • Target Tracking Quality – Minimal sampling rate for the minimal quality – Better tracking quality by using higher sampling rate and more sophisticated algorithms (allocate more CPU cycles). Tracking with a low sampling rate Tracking with a high sampling rate Quality vs. Resource • Quality vs. Invested Amount of Resource • Optimal Use of Limited Resource for Best Quality Resource 3 Resource Assignment Problem • How multiple tasks share the limited resource such that the sum of quality can be maximized ? Optimal Frequency Assignment for Quality Optimization ( ) ( ) min , 2 2 min , 1 1 2 2 1 1 2 2 1 1 , Subject to V V Maximize f f f f UB f c f c f f ≥ ≥ ≤ + + Missile Air plane ( ) ( ) 2 2 2 1 2 2 2 β α ω + − − = f e f V ( ) ( ) 1 1 1 1 1 1 1 β α ω + − − = f e f V 4 Problem Formulation ( ) ∑ ∑ = = + − − = n i n i f i i i i i i e f V 1 1 1 ) ( β α ω n i f f UB f c i i n i i i , , 1 all for , min , 1 L = ≥ ≤ ∑ = Maximize...
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This note was uploaded on 07/02/2008 for the course COMPUTER S 664 taught by Professor Leechangkyu during the Spring '08 term at Korea University.

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lec20_QosMana - 1 Chang-Gun Lee Seoul National University...

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