Podcast
Questions and Answers
In a Real-Time Operating System, EDF scheduling assigns a dynamic priority to each task according to its request rate.
In a Real-Time Operating System, EDF scheduling assigns a dynamic priority to each task according to its request rate.
False (B)
The primary goal of a multimedia server is to serve an unlimited number of clients with simultaneous requests.
The primary goal of a multimedia server is to serve an unlimited number of clients with simultaneous requests.
False (B)
In a Real-Time Operating System, the process manager maps each process onto the CPU resources according to their priority.
In a Real-Time Operating System, the process manager maps each process onto the CPU resources according to their priority.
True (A)
Rate-monotonic scheduling is a non-preemptive scheduling algorithm.
Rate-monotonic scheduling is a non-preemptive scheduling algorithm.
A storage system designed for continuous media storage and retrieval must prioritize sequential access over random access.
A storage system designed for continuous media storage and retrieval must prioritize sequential access over random access.
Deterministic algorithms provide statistical guarantees to clients.
Deterministic algorithms provide statistical guarantees to clients.
Real-Time Operating Systems do not require specialized resource allocation schemes to manage multimedia applications.
Real-Time Operating Systems do not require specialized resource allocation schemes to manage multimedia applications.
In a SAN architecture, storage devices are connected directly to servers.
In a SAN architecture, storage devices are connected directly to servers.
Intra-stream synchronization refers to the synchronization of multiple media streams.
Intra-stream synchronization refers to the synchronization of multiple media streams.
Network-attached storage (NAS) is a type of storage system that provides block-level access to files.
Network-attached storage (NAS) is a type of storage system that provides block-level access to files.
Data striping schemes are used to increase the capacity of tertiary storage.
Data striping schemes are used to increase the capacity of tertiary storage.
Inter-object synchronization is the lowest level of synchronization in multimedia streaming.
Inter-object synchronization is the lowest level of synchronization in multimedia streaming.
In a streaming server, the communicator subsystem is responsible for retrieving media components from the storage system.
In a streaming server, the communicator subsystem is responsible for retrieving media components from the storage system.
Media synchronization mechanisms are required to ensure that packets are delivered in a timely manner to prevent congestion in the internet.
Media synchronization mechanisms are required to ensure that packets are delivered in a timely manner to prevent congestion in the internet.
The operating system is a subsystem of the streaming server that is responsible for processing multimedia data under timing constraints.
The operating system is a subsystem of the streaming server that is responsible for processing multimedia data under timing constraints.
Packets that are successfully delivered to the client are first processed by the transport layer and then by the application layer.
Packets that are successfully delivered to the client are first processed by the transport layer and then by the application layer.
A streaming server typically consists of four subsystems: communicator, operating system, storage system, and media decoder.
A streaming server typically consists of four subsystems: communicator, operating system, storage system, and media decoder.
Flashcards
Real-Time Operating System (RTOS)
Real-Time Operating System (RTOS)
An operating system designed for real-time applications, essential for meeting timing requirements in streaming and other time-sensitive tasks.
Process Management in RTOS
Process Management in RTOS
Managing and allocating the processor's resources to processes in an RTOS.
EDF and Rate-Monotonic Scheduling
EDF and Rate-Monotonic Scheduling
Scheduling algorithms used in RTOS to meet the timing needs of continuous media.
EDF Scheduling
EDF Scheduling
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Rate-Monotonic Scheduling
Rate-Monotonic Scheduling
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Resource Management in RTOS
Resource Management in RTOS
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Admission Control Algorithms
Admission Control Algorithms
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Deterministic Algorithms
Deterministic Algorithms
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Statistical Algorithms
Statistical Algorithms
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File Management
File Management
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Data Striping
Data Striping
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Media Synchronization
Media Synchronization
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Intra-stream Sync
Intra-stream Sync
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Inter-stream Sync
Inter-stream Sync
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Inter-object Sync
Inter-object Sync
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Streaming Servers
Streaming Servers
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Streaming Server's Role
Streaming Server's Role
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Study Notes
Real-Time Operating System (RTOS)
- RTOS is necessary for real-time applications, such as streaming, to satisfy real-time requirements.
- Process management in RTOS deals with the main processor resource, mapping each process onto the CPU resources.
- RTOS uses EDF scheduling and rate-monotonic scheduling to fulfill timing requirements of continuous media.
- EDF scheduling assigns a deadline to each task and processes them in the order of increasing deadline.
- Rate-monotonic scheduling assigns a static priority to each task based on its request rate.
Resource Management
- Resource management in RTOS involves admission control and resource allocation to ensure Quality of Service (QoS) for clients.
- Admission control algorithms can be classified into deterministic and statistical algorithms.
- Deterministic algorithms provide guarantees to clients, while statistical algorithms provide statistical guarantees.
- Resource allocation schemes can be either deterministic (making reservations for the worst case) or statistical (achieving utilization by allowing temporary overload).
File Management
- The file system provides access and control functions for file storage and retrieval in RTOS.
- File management is essential for multimedia storage and retrieval.
Storage System
- Data striping schemes scatter multimedia files across multiple disks, allowing parallel access to the disk array.
- Tertiary and hierarchical storage can increase capacity, while SAN (Storage Area Network) architecture and NAS (Network-Attached Storage) are proposed for deploying large-scale storage.
Media Synchronization
- Media synchronization is essential for maintaining temporal relationships within and between media streams.
- There are three levels of synchronization: intra-stream sync (lowest layer), inter-stream sync (second layer), and inter-object sync (integrates streams and time-independent data).
- Media synchronization mechanisms are required to achieve synchronization between video and audio presentations.
Streaming Servers
- Streaming servers play a key role in providing a streaming service by processing multimedia data under timing constraints.
- Streaming servers retrieve media components in a synchronous fashion to prevent jerkiness in video motion and pops in audio during playback.
- A streaming server typically consists of three subsystems: communicator, operating system, and storage system.
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