1 / 11

Client/Server Computing:

Client/Server Computing:. Clients, Severs, & Operating Systems The Martian C/S (Part 2) PCMag: 7/1/97 NOS PCMag: Beyond Unix. Peer-to-Peer. Pros: Simple to set up Efficient for small groups Allows resource sharing Cons: Security is limited no mechanism for large scale sharing

stu
Télécharger la présentation

Client/Server Computing:

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Client/Server Computing: Clients, Severs, & Operating Systems The Martian C/S (Part 2) PCMag: 7/1/97 NOS PCMag: Beyond Unix

  2. Peer-to-Peer • Pros: • Simple to set up • Efficient for small groups • Allows resource sharing • Cons: • Security is limited • no mechanism for large scale sharing • Inefficient for large groups • Bad for important applications

  3. Anatomy of a Server program • Role is to serve multiple clients • Waits for client-initiated requests • Multitasking: many requests at once • Priority Queue • Background task activities • Mission-critical application • Scaleable

  4. Basic Server requirements of an OS • Preemptive Multi-tasking • Prioritization of tasks • Synchronization (Semaphores) • Local/Remote transparent • Thread capable • Resource protection (Sandbox1) • High performance file system • Memory managing (Sandbox2) • Extendable

  5. Extended OS services • Ubiquitous communications • Flexible access to shared resources • Network Management • Global dirs & Yellow Pages • Authentication services • Time, Database, TP monitoring • Object Oriented Services • Web, DNS, DHCP, etc.

  6. Anatomy of a Client • C/S systems are client centric • Non-GUI clients • ATM, barcode readers, cellphones • daemon programs, testers, agents • GUI clients • human interaction • occasional requests • Serial in nature • OOUI clients • Non-serial tasks

  7. OOUI • GUI • application centric • WIMP interface • OOUI • object centric • transparent access to applications • seamless OS extension • drag-and-drop interface • stated interface • user friendly

  8. Client requirements of an OS • RPC mechanism • File transfer • Task priorities • Interprocess communication • Threads & multitasking

  9. Server Scalability • Simple • Multiprocessing • Asymmetric(hierarchy) • Symmetric (equality) • Multiservers

  10. OS comparisons: Clients • Client centric • DOS & Win 3.x limited potential • Win95 ok only (OS/2) • 32-bit system required

  11. OS comparisons: Servers • IntranetWare • Netware File&print server standard • NT Server 4.0 • most new development • integration with BackOffice • OS/2 • Un*x • binary compatibility • Microkernels

More Related