Ibm I5/OS Manuale Utente Scaricare il pdf (Pagina 15)

iSeries. mySeries.

Processor Concepts

Virtual Processors

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Rules & requirements :

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It is possible to allocate more virtual processors than there are in the shared processor pool

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The actual number of processor in the shared processor pool is a “floating” number

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A single physical processor can report in the system as a n-ways

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You cannot allocate less than 0.10 PU per virtual processor

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Example : requesting 0.20 PU to run on 4 VCPU means 0.20 / 4 = 0.05 < 0.10 !

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Changes are dynamic, without any IPL within the configured ranges

iSeries. mySeries.

Processor Concepts

Uncapped Processors

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Uncapped allows to potentially utilizes unused processor capacity in the system

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Uncapped weight is used to determine how unused capacity is distributed :

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P1 weight is 200

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P2 weight is 100

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P1 will receive 2/3 of the unused shared processor capacity

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P2 will receive 1/3 of the unused shared processor capacity

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If P1 does not need all 2/3 of capacity, then P2 could get more !

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Ibm I5/OS Manuale Utente Pagina 15