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- Q4680753 subject Q8707179.
- Q4680753 abstract "Adaptive partition schedulers are a relatively new type of partition scheduler, pioneered with the most recent version of the QNX operating system. Adaptive partitioning, or AP, allows the real-time system designer to request that a percentage of processing resources be reserved for a particular partition (group of threads and/or processes making up a subsystem). The operating system's priority-driven pre-emptive scheduler will behave in the same way that a non-AP system would until the system is overloaded (i.e. system-wide there is more computation to perform than the processor is capable of sustaining over the long term). During overload, the AP scheduler enforces hard limits on total run-time for the subsystems within a partition, as dictated by the allocated percentage of processor bandwidth for the particular partition.If the system is not overloaded, a partition that is allocated (for example) 10% of the processor bandwidth, can, in fact, use more than 10%, as it will borrow from the spare budget of other partitions (but will be required to pay it back later). This is very useful for the non real-time subsystems that experience variable load, since these subsystems can make use of spare budget from hard real-time partitions in order to make more forward progress than they would in a fixed partition scheduler such as ARINC-653, but without impacting the hard real-time subsystems' deadlines.QNX 6.3.2 and 6.4.X have this feature.".
- Q4680753 wikiPageExternalLink Adaptive_Partitioning_Scheduler.
- Q4680753 wikiPageExternalLink arinc653.html.
- Q4680753 wikiPageExternalLink Wpaper3.html.
- Q4680753 wikiPageWikiLink Q3988.
- Q4680753 wikiPageWikiLink Q58778.
- Q4680753 wikiPageWikiLink Q676052.
- Q4680753 wikiPageWikiLink Q8707179.
- Q4680753 comment "Adaptive partition schedulers are a relatively new type of partition scheduler, pioneered with the most recent version of the QNX operating system. Adaptive partitioning, or AP, allows the real-time system designer to request that a percentage of processing resources be reserved for a particular partition (group of threads and/or processes making up a subsystem).".
- Q4680753 label "Adaptive partition scheduler".