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3/18/2001, Pervasive Service Infrastructure 1 Pervasive Services Infrastructure (Ψ) Dejan S. Milojicic HP Labs, Palo Alto 3/15 2001

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Presentation on theme: "3/18/2001, Pervasive Service Infrastructure 1 Pervasive Services Infrastructure (Ψ) Dejan S. Milojicic HP Labs, Palo Alto 3/15 2001"— Presentation transcript:

1 3/18/2001, Pervasive Service Infrastructure 1 Pervasive Services Infrastructure (Ψ) Dejan S. Milojicic HP Labs, Palo Alto 3/15 2001 http://www.hpl.hp.com/research/itc/csl/pss/psi

2 3/18/2001, Pervasive Service Infrastructure 2 Ψs Strategic Direction InternetWireless Service Providers Global eCommerce to reach $6.8 trillion by 2004 (Forrester Research) Internet Service Gateway market to reach 25M US homes by 2005, worth $5B (Parks Assoc.) Commerce over mobile phones in W. Europe rise to $37.7B in 2004 ($51.2M in 1999, IDC) Worldwide shipments of handheld computers will surpass 5.7M, 47% increase (Dataquest)

3 3/18/2001, Pervasive Service Infrastructure 3 What is Disruptive in this Space General pervasive (ubiquitous, invisible) deployment of computers, smart spaces scale: large number of devices (localized) & services User perspective user interfaces, user intent context awareness diversity of services and clients connectivity Developer perspective versioning and maintaining products (scale thereof) variation in network speed (wireless wired; wired memory) the price of each component (reduced cost) service interoperability (everything available on the Internet)

4 3/18/2001, Pervasive Service Infrastructure 4 Tough Problems Today Wireless speed (need higher bandwidth, lower latency) Unreliable connections (missing disconnected support) Lack of apps and app development tools Lack of solid infrastructure (database, synchronization) Non-scalable solutions Non-trusted solutions (lack of end-to-end security) Lack of quality displays & U/I Few users (innovators and early adopters) Protocols evolving (WAP, XML implementations, APIs) User experience (clumsy handheld, poor I/F) Viability (fractured embedded OS space)

5 3/18/2001, Pervasive Service Infrastructure 5 Relaxing Assumptions for 2004 (not all problems are s) Ubiquitous connectivity (3G+) End-to-end security (Wireless VPN) Device interoperability (Lucent & Novell, Motorola & Lucent, etc) Better battery lifetimes (piezoelectric, solar, bioelectric, etc.) Handheld, phones, others,… converged Billing, customer care commodity services Voice U/I (many already work on) Higher quality color displays New Web apps built from ground up Middleware solutions adapt access to existing apps Wireless Web crosses the chasm Consolidation of embedded OS space

6 3/18/2001, Pervasive Service Infrastructure 6 What are Remaining Problems Scalability (localized) Service access and adaptivity in dynamic environments Administration (automatic, transparent, dependency aware) One-size fits all (embedded system software solutions) Interoperability (APIs, service brokers, etc.) Performance e.g. load, latency, caching Maintaining true end-to-end security guarantees

7 3/18/2001, Pervasive Service Infrastructure 7 Scenario Scene: Helsinki airport, year 2004. Jane and Dave are on a business trip to present a new product to overseas customers. Dave worked the whole weekend at home on an updated presentation. They are stepping off of the plane. Jane: Relax Dave, everything is going to be fine. Your presentation is in good shape. Just fix the typo in the CTOs name and tune the figures, Dave: Fix the title! Tune the figures! Are you out of your mind?! I only have the presentation on my phone. Id need to download and fix it on my laptop. We dont have time for that before the meeting. Jane: Yes, you can. I can do it on my new phonDA. Dave: You never told me you got a new, more powerful phonDA Jane: No, its the same as yours, NK234yP, but Ive updated the software. Dave: No way, my presentation is 4G. It cant fit on any phonDA Jane: Look, I download your presentation... Heres the slide you want, … ok… the CTOs title is fixed, … now lets see the figures… itll take longer… ok, here are figures, move the 2003 forecast up a little,.. perfect.

8 3/18/2001, Pervasive Service Infrastructure 8 Scenario, cont. Dave: How did you do it?!! Look, Im downloading it on my phonDA and it takes forever… even worse, now it wont start. Jane: You see those small bumps on the walls, ceiling, and floor. These are embedded servers. Software on my phonDA offloads networking, memory, processing, storage - you name it - to these servers. Dave: Sigh… Jane: It is called Psi; its very simple. Now with respect to these bumps on walls, … hold on a second… my daughter is paging me, first things first…. Yes honey, … I forgot to sign your homework … ooops … Dave: Can your magic Psi help with this too? Jane: Sure it can, see, here it will download her application from her school – it adapts to my phonDA since the app is designed for desktops– its really downloaded on a server there. Looks correct, ok signed!

9 3/18/2001, Pervasive Service Infrastructure 9 Scenario, cont. Dave: Wow, you are a wizard, installing all these applications, adapting them to your small phonDA. How long did it take you? Jane: Not a second, Psi does it all, it adapts, it downloads services on demand. Ψ Sigh

10 3/18/2001, Pervasive Service Infrastructure 10 Pervasive Servers & Clients..servers…..clients…..intermediate servers… Ψ IDCs..embedded devices and sensors… infrastructure embedded

11 3/18/2001, Pervasive Service Infrastructure 11 Conceptual Layers Local OSes & JVMs Ψ platform: match service requirements to client resources Middleware Layers E-Speak, Jini, CORBA, ACL Services and Applications Client Handheld Device (and Infrastructure Servers)

12 3/18/2001, Pervasive Service Infrastructure 12 Ψ Vision Adapt any service to any client (anywhere, anytime) General assumptions clients will always be diverse clients will always be less powerful than desktops there will be a large scale of devices in the future services will be accessible on demand from anywhere Underlying assumptions: service adaptivity required three-tier model service splitting

13 3/18/2001, Pervasive Service Infrastructure 13 Ψ, Important Research Questions How to enable users to exploit the new pervasive computer infrastructure How to seamlessly offer more services to more clients anytime anywhere? How to avoid installing and administering increasing number of computers in a pervasive infrastructure? What are new abstractions and algorithms for computation, communication, storage, user interface how to write and run new apps? It is not the strongest of the species that survive, nor the most intelligent, but the ones most responsive to change - Charles Darwin

14 3/18/2001, Pervasive Service Infrastructure 14 Adaptive Offloaded Services Goal: increase scalability & performance of (mobile) service delivery to resource-poor devices and enable where not currently possible Key research questions Splitting service between client and mid-point (intermediate) servers Dynamic adjustment of services: device size, load, roaming Masking performance implications of splitting Required infrastructure topics Distributed run-time support - mid-point(s) and client Sharing, administration, and security at mid-points

15 3/18/2001, Pervasive Service Infrastructure 15 Adaptive Offloaded Services Illustration IDC 010101 111010 0 Back-end service execution Embedded server dependent execution 0101 1110 0101 1110 Which? 0101 1110 Internet DSL Phone Home, office, shop, etc.

16 3/18/2001, Pervasive Service Infrastructure 16 Adaptive Offloaded Services, Cont. Splitting services Monitoring (resources, execution, objects) Offloading (migration mechanisms, trigger & placement policies) Service splitting (interaction metrics, graph partitioning, 3-v. 2-tier) Adaptive Offloading Adapting to devices (very constrained, different resources) Adapting to load (multiple services, scalability) Adapting to mobility (roaming, migration of offloaded state) Performance Policies (account for overhead, interaction metric, stability) Mechanisms (offloading overhead, disruption of offloading - lazy)

17 3/18/2001, Pervasive Service Infrastructure 17 The Java Heap Page Working Set of Embedded Caffeine Mark

18 3/18/2001, Pervasive Service Infrastructure 18 Services on Demand Goal: zero-administration and -installation of mobile clients Key research questions dynamic service composition and deployment on zero-installed devices de/re-coupling of users service context between devices tolerance to disconnection of services Required infrastructure topics service brokers and infrastructure device encapsulation APIs

19 3/18/2001, Pervasive Service Infrastructure 19 Services on Demand Illustration Back-end service execution Internet Home, office, shop, etc. Secured Storage Provider Service broker ASP ASP Day 1, John in Sydney Day 2, John in Montreal

20 3/18/2001, Pervasive Service Infrastructure 20 Loading Overheads Service Local Load (s) SoD Loading (s)Loaded URLsJava Class IntranetWaveDialupCntSize (B)CntSize (B) calculator 0.1~0+0.1+4.7295202 calendar 0.2~0+0.4+4.74129524 editor 0.2~0+0.3+5.27158857 game 0.2~0+0.3+6.19187399 agenda 0.2+0.1+0.7+8.41353601259846 ftp 0.6+2.1+3.2+20.9310772522142155 mail 2.5+2.7+15.1+129.41675046138365574

21 3/18/2001, Pervasive Service Infrastructure 21 Services on Demand, Cont. Service Composition/Deployment on Zero-Installed Devices service characterization (naming, keyword, extension, requirements) service discovery (brokers, resource matching, scalability) deployment (transparent downloading & caching, sandboxing for service inter- communication De/re-Coupling of Service Context Between Devices remote storage (clients are volatile, access any time anywhere, user/service transparency, stackable client RFS, synchronization/encryption) context information (per service state, preferences, expressed as files) Adaptation to different client (resource re-evaluation, select service) Tolerance to Disconnection of Services client side cache (static content: URLs, classes; user files/data; user/service network interactions reconnection (pluggable reconciliation per service/file, client-initiated

22 3/18/2001, Pervasive Service Infrastructure 22 Architectural Principles Minimal changes (extensions) to the underlying client sys SW Minimal changes to services (mainly splitting) Use existing mid-point servers in the infrastructure Psi will rely on standard communication protocols (IP, WAP, etc) however, it will have the ability to support extension to new ones Heterogeneity of underlying OSes and implementation of JVMs The primary metric will be enabling new services and better use of resource-constrained devices

23 3/18/2001, Pervasive Service Infrastructure 23 Implementation Details Prototype environment Jornada Pocket PC Java VM, Chai VM wireless 802.11 Linux PCs for infrastructure servers Services tools: editors (text/image) visualization PIM: calendars, mail, calculators, stock analysis interactive games etc.

24 3/18/2001, Pervasive Service Infrastructure 24 Technical Approach Develop a architecture & prototype implementation Experimental, quick prototyping, 3-month increments Spiral approach Incrementally demonstrate new functionality Uncover new key questions Engage partners at incremental 3-month phases HPL, HP, university, industry (external) Patent/publish as we progress

25 3/18/2001, Pervasive Service Infrastructure 25 Showcases Adaptive offloaded services initial mobile app splitting, evaluate split advantage (scale/perf/power) app which is too resource intensive for existing devices app which is interactive mobile editing and interactive gaming app which is data intensive mobile multimedia and visualization Service-on-Demand service broker lookup, automatic download, disconnected mode (cache/remote) app that can work disconnected (runs part of the service locally) app that accesses user data from a server app in two different flavors, to adapt to Palm constrained resources

26 3/18/2001, Pervasive Service Infrastructure 26 Current Insights Opportunity for memory offloading Complex interactions in Java objects Transparent remote storage: class interposition, bytecode editing Disconnection: caching of some class client/service interactions Reconciliation through plugins

27 3/18/2001, Pervasive Service Infrastructure 27 Team Members Resource-Constrained Devices, team lead OS, JVM, consumer products (Sony) Team member HA, distributed systems (SRI, Informix, Oracle) Services-on-Demand, team lead OS, JVM (Bull, OSF RI) Dejan Milojicic, (myself) Psi PM OS, distributed systems & agents (Belgrade RI, OSF RI)

28 3/18/2001, Pervasive Service Infrastructure 28 Competition Telcos AT&T, Motorola, Ericsson Consumer electronics companies Sony, Philips, etc. (HAVI) Traditional computer systems companies Sun (Jini, embedded/real-time Java); Microsoft (.NET, Windows CE) IBM (pervasive computing, embedded tools) Data base companies Oracle, Sybase Many startups StreamTheory, OmniShift, Transvirtual, M2Verticom, WirelessKnowledge Many universities, government Numerous competition, but huge business & innovation opportunity

29 3/18/2001, Pervasive Service Infrastructure 29 Related Work Adaptability & Offloading UW (Portolano) Active Fabrics + service infrastructure Berkeleys (Endeavor) Ninja + general service offloading Palm, WinCE + offloading to shared mid-points OSGi + general purpose + distributed; UW Kimera + dynamic service split CMU Odyssey, UIUC Active Spaces + service splitting MIT Oxygen SW environment + resource awareness Data storage & resource management CMU Coda & Odyssey + reconciliation framework UCLA File mobility + trust for services; WebFS + more than web browsing OSGI + mobility; Java OS JDI & JPI + API signatures Java platform JavaOS + service infrastructure; PocketLinux + disconnected + other OSes JNT, but not just a terminal; WebOS + service brokers & trust

30 3/18/2001, Pervasive Service Infrastructure 30 What Ψ is Not About Client HW HW (re)configuration Service design & implementation New protocols New programming languages General purpose wireless Device location technologies General purpose OS development Fault-tolerance Hard real-time

31 3/18/2001, Pervasive Service Infrastructure 31 Summary Intersection of services, the Internet, and wireless: adapt services to existing client resources automate service deployment reason about new, disruptive technologies in pervasive computing Potential long-term area of research, ties in servers (IDCs) & client pervasive infrastructures academia, government, big & small companies different markets A lot of opportunities for contribution; risk-aware, leverage potential It is fun to do these things! Immediate benefit obvious

32 3/18/2001, Pervasive Service Infrastructure 32 Pervasive Computing Landscape device connectivity service connectivity internet com (IP) mobile com. (non IP) nomadic location transparency context management user/agent model (intelligence) application model (information access & presentation) information architecture XML UDDI VML … security mgmt pricing/ charging development adaptivity task mobility global data placement user studies


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