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Deos, a time and space partitioned real-time operating system containing a working Rate Monotonic Scheduler. Dynamic priority scheduling; Earliest deadline first scheduling; RTEMS, an open source real-time operating system containing a working Rate Monotonic Scheduler. Scheduling (computing) Queueing theory; Kingman's formula
Xen has had an EDF scheduler for some time now. The man page contains a short description. The Plan 9 OS from Bell Labs incorporates EDFI, a "lightweight real-time scheduling protocol that combines EDF with deadline inheritance over shared resources." [7] RTEMS: The EDF scheduler will be available in version 4.11. RTEMS SuperCore
RTEMS is designed for real-time, embedded systems and to support various open application programming interface standards including Portable Operating System Interface and μITRON (dropped in RTEMS 4.10 [2]). The API now known as the Classic RTEMS API was originally based on the Real-Time Executive Interface Definition (RTEID) specification.
Name License Source model Target uses Status Platforms Apache Mynewt: Apache 2.0: open source: embedded: active: ARM Cortex-M, MIPS32, Microchip PIC32, RISC-V: BeRTOS: Modified GNU GPL: open source
The first level schedules the partitions. This is a round-robin, fixed schedule that repeats a Major Time Frame. The Major Time Frame schedules each partition in a fixed duration Partition Time Window (sometimes called a Minor Time Frame) with a fixed Partition Time Window Offset from the start of the Major Time Frame. ARINC 653 Partition Schedule
Scheduler flexibility enables a wider, computer-system orchestration of process priorities, but a real-time OS is more frequently dedicated to a narrow set of applications. Key factors in a real-time OS are minimal interrupt latency and minimal thread switching latency ; a real-time OS is valued more for how quickly or how predictably it can ...
Nano-RK supports a fixed-priority fully preemptive scheduler with fine-grained timing primitives to support real-time task sets. "Nano" implies that the RTOS is small, using 2 KB of random-access memory (RAM) and using 18 KB of flash memory , while RK is short for resource kernel .
The scheduler is an operating system module that selects the next jobs to be admitted into the system and the next process to run. Operating systems may feature up to three distinct scheduler types: a long-term scheduler (also known as an admission scheduler or high-level scheduler), a mid-term or medium-term scheduler, and a short-term scheduler.
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