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Grids Challenged by a Web 2.0 and Multicore Sandwich. CCGrid 2007 Windsor Barra Hotel Rio de Janeiro Brazil May 15 2007 Geoffrey Fox Computer Science, Informatics, Physics Pervasive Technology Laboratories Indiana University Bloomington IN 47401 [email protected] http://www.infomall.org.

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Grids challenged by a web 2 0 and multicore sandwich

Grids Challenged by a Web 2.0 and Multicore Sandwich

CCGrid 2007

Windsor Barra Hotel

Rio de Janeiro Brazil

May 15 2007

Geoffrey Fox

Computer Science, Informatics, Physics

Pervasive Technology Laboratories

Indiana University Bloomington IN 47401

[email protected]

http://www.infomall.org


Abstract

Abstract

  • Grids provide managed support for distributed Internet Scale services and although this is clearly a broadly important capability, adoption of Grids has been slower than perhaps expected.

  • Two important trends are Web 2.0 and Multicore that have tremendous momentum and large natural communities and that both overlap in important ways with Grids.

  • Web 2.0 has services but does not require some of the strict protocols needed by Grids or even Web Services. Web 2.0 offers new approaches to composition and portals with a rich set of user oriented services.

  • Multicore anticipates 100’s of core per chip and the ability and need to “build a Grid on a chip”. This will use functional parallelism that is likely to derive its technologies from parallel computing and not the Grid realm.

  • We discuss a Grid future that embraces Web 2.0 and multicore and suggests how it might need to change.

  • Virtual Machines (Virtualization) is another important development which has attracted more interest than Grids in Enterprise scene


E moreorlessanything is an application

e-moreorlessanything is an Application

‘e-Science is about global collaboration in key areas of science, and the next generation of infrastructure that will enable it.’ from its inventor John Taylor Director General of Research Councils UK, Office of Science and Technology

e-Science is about developing tools and technologies that allow scientists to do ‘faster, better or different’ research

Similarly e-Business captures an emerging view of corporations as dynamic virtual organizations linking employees, customers and stakeholders across the world.

This generalizes to e-moreorlessanything

A deluge of data of unprecedented and inevitable size must be managed and understood.

People (see Web 2.0), computers, data and instruments must be linked.

On demand assignment of experts, computers, networks and storage resources must be supported

3


Role of cyberinfrastructure

Role of Cyberinfrastructure

Supports distributed science – data, people, computers

Exploits Internet technology (Web2.0) adding (via Grid technology) management, security, supercomputers etc.

It has two aspects: parallel – low latency (microseconds) between nodes and distributed – highish latency (milliseconds) between nodes

Parallel needed to get high performance on individual 3D simulations, data analysis etc.; must decompose problem

Distributed aspect integrates already distinct components

Cyberinfrastructure is in general a distributed collection of parallel systems

Cyberinfrastructure is made of services (often Web services) that are “just” programs or data sources packaged for distributed access

4


Not so controversial ideas

Not so controversial Ideas

  • Distributed software systems are being “revolutionized” by developments from e-commerce, e-Science and the consumer Internet. There is rapid progress in technology families termed “Web services”, “Grids” and “Web 2.0”

  • The emerging distributed system picture is of distributed services with advertised interfaces but opaque implementations communicating by streams of messages over a variety of protocols

    • Complete systems are built by combining either services or predefined/pre-existing collections of services together to achieve new capabilities

  • Note messaging (MPI and some thread systems) interesting in parallel computing to support either “safe concurrency without side effects” or distributed memory

  • We can use the term Grids strictly (Narrow or even more strictly OGSA Grids) or just call any collections of services as “Broad Grids” which actually is quite often done – in this talk Grid means Narrow or Web service Grid


Web 2 0 and web services i

Web 2.0 and Web Services I

  • Web Services have clearly defined protocols (SOAP) and a well defined mechanism (WSDL) to define service interfaces

    • There is good .NET and Java support

    • The so-called WS-* specifications provide a rich sophisticated but complicated standard set of capabilities for security, fault tolerance, meta-data, discovery, notification etc.

  • “Narrow Grids” build on Web Services and provide a robust managed environment with growing adoption in Enterprise systems and distributed science (so called e-Science)

  • Web 2.0 supports a similar architecture to Web services but has developed in a more chaotic but remarkably successful fashion with a service architecture with a variety of protocols including those of Web and Grid services

    • Over 400 Interfaces defined at http://www.programmableweb.com/apis

  • Web 2.0 also has many well known capabilities with Google Maps and Amazon Compute/Storage services of clear general relevance

  • There are also Web 2.0 services supporting novel collaboration modes and user interaction with the web as seen in social networking sites, portals, MySpace, YouTube,


Web 2 0 and web services ii

Web 2.0 and Web Services II

  • I once thought Web Services were inevitable but this is no longer clear to me

  • Web services are complicated, slow and non functional

    • WS-Security is unnecessarily slow and pedantic (canonicalization of XML)

    • WS-RM (Reliable Messaging) seems to have poor adoption and doesn’t work well in collaboration

    • WSDM (distributed management) specifies a lot

  • There are de facto standards like Google Maps and powerful suppliers like Google which “define the rules”

  • One can easily combine SOAP (Web Service) based services/systems with HTTP messages but the “lowest common denominator” suggests additional structure/complexity of SOAP will not easily survive


Applications infrastructure technologies

Applications, Infrastructure, Technologies

  • The discussion is confused by inconsistent use of terminology – this is what I mean

  • Multicore, Narrow and BroadGrids and Web 2.0 (Enterprise 2.0) are technologies

  • These technologies combine and compete to build infrastructures termed e-infrastructure or Cyberinfrastructure

    • Although multicore can and will support “standalone” clients probably most important client and server applications of the future will be internet enhanced/enabled so key aspect of multicore is its role and integration in e-infrastructure

  • e-moreorlessanything is an emerging application area of broad importance that is hosted on the infrastructures e-infrastructure or Cyberinfrastructure


Attack of the killer multicores

Attack of the Killer Multicores

  • Today commodity Intel systems are sold with 8 cores spread over two processors

  • Specialized chips such as GPU’s and IBM Cell processor have substantially more cores

  • Moore’s Law implies and will be satisfied by and imply exponentially increasing number of cores doubling every 1.5-3 Years

    • Modest increase in clock speed

    • Intel has already prototyped a 80 core Server chip ready in 2011?

  • Huge activity in parallel computing programming (recycled from the past?)

    • Some programming models and application styles similar to Grids

  • We will have a Grid on a chip …………….


Ibm cell processor

PC07Intro [email protected]

IBM Cell Processor

  • This supports pipelined (through 8 cores) or data parallel operations distributed on 8 SPE’s

Applications running well on Cell or AMD GPU should run scalably on future mainline multicore chips

Focus on memory bandwidth key

(dataflow not deltaflow)


Grids meet multicore systems

Grids meet Multicore Systems

  • The expected rapid growth in the number of cores per chip has important implications for Grids

  • With 16-128 cores on a single commodity system 5 years from now one will both be able to build a Grid like application on a chip and indeed must build such an application to get the Moore’s law performance increase

    • Otherwise you will “waste” cores …..

  • One will not want to reprogram as you move your application from a 64 node cluster or transcontinental implementation to a single chip Grid

  • However multicore chips have a very different architecture from Grids

    • Shared not Distributed Memory

    • Latencies measured in microseconds not milliseconds

  • Thus Grid and multicore technologies will need to “converge” and converged technology model will have different requirements from current Grid assumptions


Grid versus multicore applications

Grid versus Multicore Applications

  • It seems likely that future multicore applications will involve a loosely coupled mix of multiple modules that fall into three classes

    • Data access/query/store

    • Analysis and/or simulation

    • User visualization and interaction

  • This is precisely mix that Grids support but Grids of course involve distributed modules

  • Grids and Web 2.0 use service oriented architectures to describe system at module level – is this appropriate model for multicore programming?

  • Where do multicore systems get their data from?


Grids challenged by a web 2 0 and multicore sandwich

Today

Tomorrow

RMS: Recognition Mining Synthesis

Recognition

Mining

Synthesis

Is it …?

What is …?

What if …?

Find a model

instance

Create a model

instance

Model

Model-less

Real-time streaming and

transactions on

static – structured datasets

Very limited realism

Model-based

multimodal

recognition

Real-time analytics on

dynamic, unstructured,

multimodal datasets

Photo-realism and

physics-based

animation

Intel has probably most sophisticated analysis of future “killer” multicore applications

13


Grids challenged by a web 2 0 and multicore sandwich

Recognition

Mining

Synthesis

What is a tumor?

Is there a tumor here?

What if the tumor progresses?

It is all about dealing efficiently with complex multimodal datasets

Images courtesy: http://splweb.bwh.harvard.edu:8000/pages/images_movies.html

14


Intel s application stack

Intel’s Application Stack

PC07Intro [email protected]

15


Role of data in grid multicore i

Role of Data in Grid/Multicore I

  • One typically is told to place compute (analysis) at the data but most of the computing power is in multicore clients on the edge

  • These multicore clients can get data from the internet i.e. distributed sources

    • This could be personal interests of client and used by client to help user interact with world

    • It could be cached or copied

    • It could be a standalone calculation or part of a distributed coordinated computation ([email protected])

  • Or they could get data from set of local sensors (video-cams and environmental sensors) naturally stored on client or locally to client


Role of data in grid multicore

Role of Data in Grid/Multicore

  • Note that as you increase sophistication of data analysis, you increase ratio of compute to I/O

    • Typical modern datamining approach like Support Vector Machine is sophisticated (dense) matrix algebra and not just text matching

    • http://grids.ucs.indiana.edu/ptliupages/presentations/PC2007/PC07BYOPA.ppt

  • Time complexity of Sophisticated data analysis will make it more attractive to fetch data from the Internet and cache/store on client

    • It will also help with memory bandwidth problems in multicore chips

  • In this vision, the Grid “just” acts as a source of data and the Grid application runs locally


Three styles of multicore jobs

Three styles of Multicore “Jobs”

Totally independent or nearly so (B C E F) – This used to be called embarrassingly parallel and is now pleasingly so

This is preserve of job scheduling community and one gets efficiency by statistical mechanisms with (fair) assignment of jobs to cores

“Parameter Searches” generate this class but these are often not optimal way to search for “best parameters”

“Multiple users” of a server is an important class of this type

No significant synchronization and/or communication latency constraints

Loosely coupled (D) is “Metaproblem” with several components orchestrated with pipeline, dataflow or not very tight constraints

This is preserve of Grid workflow or mashups

Synchronization and/or communication latencies in millisecond to second or more range

Tightly coupled (A) is classic parallel computing program with components synchronizing often and with tight timing constraints

Synchronization and/or communication latencies around a microsecond

A1

A2

A3

A4

B

C

E

F

D1

D2

PC07Intro [email protected]

18


Multicore programming paradigms

Multicore Programming Paradigms

At a very high level, there are three broad classes of parallelism

Coarse grain functional parallelism typified by workflow and often used to build composite “metaproblems” whose parts are also parallel

This area has several good solutions getting better

Pleasingly parallel applications can be considered special cases of functional parallelism

Large Scale loosely synchronous data parallelism where dynamic irregular work has clear synchronization points as in most large scale scientific and engineering problems

Fine grain thread parallelism as used in search algorithms which are often data parallel (over choices) but don’t have universal synchronization points

Discrete Event Simulations are either a fourth class or a variant of thread parallelism

PC07Intro [email protected]

19


Programming models

Programming Models

  • So the Fine grain thread parallelism and Large Scale loosely synchronous data parallelism styles are distinctive to parallel computing while

  • Coarse grain functional parallelism of multicore overlaps with workflows from Grids and Mashups from Web 2.0

  • Seems plausible that a more uniform approach evolve for coarse grain case although this is least constrained of programming styles as typically latency issues are not critical

    • Multicore would have strongest performance constraints

    • Web 2.0 and Multicore the most important usability constraints

  • A possible model for broad use of multicores is that the difficult parallel algorithms are coded as libraries (Fine grain thread parallelism and Large Scale loosely synchronous data parallelism styles) while the general user uses composes with visual interfaces, scripting and systems like Google MapReduce


Google mapreduce simplified data processing on large clusters

Google MapReduceSimplified Data Processing on Large Clusters

http://labs.google.com/papers/mapreduce.html

This is a dataflow model between services where services can do useful document oriented data parallel applications including reductions

The decomposition of services onto cluster engines is automated

The large I/O requirements of datasets changes efficiency analysis in favor of dataflow

Services (count words in example) can obviously be extended to general parallel applications

There are many alternatives to language expressing either dataflow and/or parallel operations and indeed one should support multiple languages in spirit of services

PC07Intro [email protected]

21


Old and new web 2 0 community tools

Old and New (Web 2.0) Community Tools

  • e-mail and list-serves are oldest and best used

  • Kazaa, Instant Messengers, Skype, Napster, BitTorrent for P2P Collaboration – text, audio-video conferencing, files

  • del.icio.us, Connotea, Citeulike, Bibsonomy, Biolicious manage shared bookmarks

  • MySpace, YouTube, Bebo, Hotornot, Facebook, or similar sites allow you to create (upload) community resources and share them; Friendster, LinkedIn create networks

    • http://en.wikipedia.org/wiki/List_of_social_networking_websites

  • Writely, Wikis and Blogs are powerful specialized shared document systems

  • ConferenceXP and WebEx share general applications

  • Google Scholar tells you who has cited your papers while publisher sites tell you about co-authors

    • Windows Live Academic Search has similar goals

  • Note sharing resources creates (implicit) communities

    • Social network tools study graphs to both define communities and extract their properties


Best web 2 0 sites 2006

“Best Web 2.0 Sites” -- 2006

  • Extracted from http://web2.wsj2.com/

  • Social Networking

  • Start Pages

  • Social Bookmarking

  • Peer Production News

  • Social Media Sharing

  • Online Storage (Computing)


Web 2 0 systems are portals services resources

Web 2.0 Systems are Portals, Services, Resources

  • Captures the incredible development of interactive Web sites enabling people to create and collaborate


Mashups v workflow

Mashup Tools are reviewed at http://blogs.zdnet.com/Hinchcliffe/?p=63

Workflow Tools are reviewed by Gannon and Fox http://grids.ucs.indiana.edu/ptliupages/publications/Workflow-overview.pdf

Both include scripting in PHP, Python, sh etc. as both implement distributed programming at level of services

Mashups use all types of service interfaces and do not have the potential robustness (security) of Grid service approach

Typically “pure” HTTP (REST)

Mashups v Workflow?


Grid workflow datamining in earth science

Streaming Data

Support

Archival

Transformations

Data Checking

Hidden MarkovDatamining (JPL)

Real Time

Display (GIS)

Grid Workflow Datamining in Earth Science

NASA GPS

  • Work with Scripps Institute

  • Grid services controlled by workflow process real time data from ~70 GPS Sensors in Southern California

Earthquake


Web 2 0 uses all types of services

Web 2.0 uses all types of Services

  • Here a Gadget Mashup uses a 3 service workflow with a JavaScript Gadget Client


Web 2 0 apis

Web 2.0 APIs

  • http://www.programmableweb.com/apis has (May 14 2007) 431 Web 2.0 APIs with GoogleMaps the most often used in Mashups

  • This site acts as a “UDDI” for Web 2.0


The list of web 2 0 api s

The List of Web 2.0 API’s

  • Each site has API and its features

  • Divided into broad categories

  • Only a few used a lot (42 API’s used in more than 10 mashups)

  • RSS feed of new APIs

  • Amazon S3 growing in popularity


Apis mashups per protocol distribution

google maps

del.icio.us

virtual earth

411sync

yahoo! search

yahoo! geocoding

technorati

netvibes

yahoo! images

trynt

amazon ECS

yahoo! local

live.com

google search

flickr

ebay

youtube

amazon S3

REST

SOAP

XML-RPC

REST,

XML-RPC

REST,

XML-RPC, SOAP

REST,

SOAP

JS

Other

APIs/Mashups per Protocol Distribution

Number of

APIs

Number of

Mashups


4 more mashups each day

Growing number of commercial Mashup Tools

4 more Mashups each day

  • For a total of 1906 April 17 2007 (4.0 a day over last month)

  • Note ClearForest runs Semantic Web Services Mashup competitions (not workflow competitions)

  • Some Mashup types: aggregators, search aggregators, visualizers, mobile, maps, games


Mash planet web 2 0 architecture

Mash Planet Web 2.0 Architecture

http://www.imagine-it.org/mashplanet

Display too large to be a Gadget


Grids challenged by a web 2 0 and multicore sandwich

Searched on Transit/Transportation

Searched on Transit/Transportation


Grids challenged by a web 2 0 and multicore sandwich

Adapter

Adapter

Adapter

Tile Server

Cache Server

Google Maps Server

Marion County Map Server

(ESRI ArcIMS)

Hamilton County Map Server

(AutoDesk)

Cass County Map Server

(OGC Web Map Server)

Must provide adapters for each Map Server type .

Browser client fetches image tiles for the bounding box using Google Map API.

Tile Server requests map tiles at all zoom levels with all layers. These are converted to uniform projection, indexed, and stored. Overlapping images are combined.

The cache server fulfills Google map calls with cached tiles at the requested bounding box that fill the bounding box.

Browser +

Google Map API

A “Grid” Workflow

(built in Java!)

Uses Google Maps clients and server and non Google map APIs


Indiana map grid workflow mashup

Indiana Map Grid Workflow/Mashup

GIS Grid of “Indiana Map” and ~10 Indiana counties with accessible Map (Feature) Servers from different vendors. Grids federate different data repositories (cf Astronomy VO federating different observatory collections)


Grid style portal as used in earthquake grid

Grid-style portal as used in Earthquake Grid

The Portal is built from portlets – providing user interface fragments for each service that are composed into the full interface – uses OGCE technology as does planetary science VLAB portal with University of Minnesota

Now to Portals


Portlets v google gadgets

Note the many competitions powering Web 2.0 Mashup Development

Portlets v. Google Gadgets

  • Portals for Grid Systems are built using portlets with software like GridSphere integrating these on the server-side into a single web-page

  • Google (at least) offers the Google sidebar and Google home page which support Web 2.0 services and do not use a server side aggregator

  • Google is more user friendly!

  • The many Web 2.0 competitions is an interesting model for promoting development in the world-wide distributed collection of Web 2.0 developers

  • I guess Web 2.0 model will win!


Typical google gadget structure

Google Gadgets are an example of

Start Page technologySee http://blogs.zdnet.com/Hinchcliffe/?p=8

Typical Google Gadget Structure

  • … Lots of HTML and JavaScript </Content> </Module>

Portlets build User Interfaces by combining fragments in a standalone Java Server

Google Gadgets build User Interfaces by combining fragments with JavaScript on the client


Web 2 0 v narrow grid i

Web 2.0 v Narrow Grid I

  • Web 2.0 allows people to nurture the Internet Cloud and such people got Time’s person of year award

  • Whereas NarrowGrids support Internet scale Distributed Services with similar architecture

  • Maybe NarrowGrids focus on (number of) Services (there aren’t many scientists) and Web 2.0 focuses on number of People

  • Both agree on service oriented architectures but have different emphasis

  • Narrow Grids have a strong emphasis on standards and structure; Web 2.0 lets a 1000 flowers (protocols) and a million developers bloom and focuses on functionality, broad usability and simplicity

    • Semantic Web/Grid has structure to allow reasoning

    • Annotation in sites like del.icio.us and uploading to MySpace/YouTube is unstructured and free text search replaces structured ontologies


Web 2 0 v narrow grid ii

The world does itself in large numbers!

Web 2.0 v Narrow Grid II

  • Web 2.0 has a set of major services like GoogleMaps or Flickr but the world is composing Mashups that make new composite services

    • End-point standards are set by end-point owners

    • Many different protocols covering a variety of de-facto standards

  • Narrow Grids have a set of major software systems like Condor and Globus and a different world is extending with custom services and linking with workflow

  • Popular Web 2.0 technologies are PHP,JavaScript, JSON, AJAX and REST with “Start Page” e.g. (Google Gadgets) interfaces

  • Popular Narrow Grid technologies are Apache Axis,BPEL WSDL and SOAP with portlet interfaces

  • Robustness of Grids demanded by the Enterprise?

  • Not so clear that Web 2.0 won’t eventually dominate other application areas and with Enterprise 2.0 it’s invading Grids


Implication for grid technology of multicore and web 2 0 i

Implication for Grid Technology of Multicore and Web 2.0 I

  • Web 2.0 and Grids are addressing a similar application class although Web 2.0 has focused on user interactions

    • So technology has similar requirements

  • Multicore differs significantly from Grids in component location and this seems particularly significant for data

    • Not clear therefore how similar applications will be

    • Intel RMS multicore application class pretty similar to Grids

  • Multicore has more stringent software requirements than Grids as latter has intrinsic network overhead

41


Implication for grid technology of multicore and web 2 0 ii

Implication for Grid Technology of Multicore and Web 2.0 II

  • Multicore chips require low overhead protocols to exploit low latency that suggests simplicity

    • We need to simplify MPI AND Grids!

  • Web 2.0 chooses simplicity (REST rather than SOAP) to lower barrier to everyone participating

  • Web 2.0 and Multicore tend to use traditional (possibly visual) (scripting) languages for equivalent of workflow whereas Grids use visual interface backend recorded in BPEL

    • Google MapReduce illustrates a popular Web 2.0 and Multicore approach to dataflow

42


Implication for grid technology of multicore and web 2 0 iii

Implication for Grid Technology of Multicore and Web 2.0 III

  • Web 2.0 and Grids both use SOA Service Oriented Architectures

    • Seems likely that Multicore will also adopt although a more conventional object oriented approach also possible

    • Services should help multicore applications integrate modules from different sources

    • Multicore will use fine grain objects but coarse grain services

  • “System of Systems”: Grids, Web 2.0 and Multicore are likely to build systems hierarchically out of smaller systems

    • We need to support Grids of Grids, Webs of Grids, Grids of Multicores etc. i.e. systems of systems of all sorts

43


Implication for grid technology of multicore and web 2 0 iv

Implication for Grid Technology of Multicore and Web 2.0 IV

  • Portals are likely to feature both Web and “desktop client” technology although it is possible that Web approach will be adopted more or less uniformly

  • Web 2.0 has a very active portal activity which has similar architecture to Grids

    • A page has multiple user interface fragments

  • Web 2.0 user interface integration is typically Client side using Gadgets AJAX and JavaScript while

    • Grids are in a special JSR168 portal server side using Portlets WSRP and Java

  • Multicore doesn’t put special constraints on portal technology but it could tend to favor non browser client or client side Web browser integrated portals

44


The momentum effects

The “Momentum” Effects

  • Web 2.0 has momentum as it is driven by success of social web sites and the user friendly protocols attracting many developers of mashups

  • Grids momentum driven by the success of eScience and the commercial web service thrusts largely aimed at Enterprise

    • Enterprise software area not quite as dominant as in past

    • Grid technical requirements are a bit soft and could be compromised if sandwiched by Web 2.0 and Multicore

    • Will commercial interest in Web Services survive?

  • Multicore driven by expectation that all servers and clients will have many cores

    • Multicore latency requirements imply cannot compromise in some technology choices

  • Simplicity, supporting many developers and stringent multicore requirements are the forces pressuring Grids!


The ten areas covered by the 60 core ws specifications

The Ten areas covered by the 60 core WS-* Specifications


Ws areas and web 2 0

WS-* Areas and Web 2.0


Ws areas and multicore

WS-* Areas and Multicore


Ccr as an example of a cross paradigm run time

CCR as an example of a Cross Paradigm Run Time

  • Naturally supports fine grain thread switching with message passing with around 4 microsecond latency for 4 threads switching to 4 others on an AMD PC with C#. Threads spawned – no rendezvous

  • Has around 50 microsecond latency for coarse grain service interactions with DSS extension which supports Web 2.0 style messaging

  • MPI Collectives – Shift and Exchange vary from 10 to 20 microsecond latency in rendezvous mode

  • Not as good as best MPI’s but managed code and supports Grids Web 2.0 and Parallel Computing ……

  • See http://grids.ucs.indiana.edu/ptliupages/publications/CCRApril16open.pdf


Microsoft ccr

Microsoft CCR

Supports exchange of messages between threads using named ports

FromHandler: Spawn threads without reading ports

Receive: Each handler reads one item from a single port

MultipleItemReceive: Each handler reads a prescribed number of items of a given type from a given port. Note items in a port can be general structures but all must have same type.

MultiplePortReceive: Each handler reads a one item of a given type from multiple ports.

JoinedReceive: Each handler reads one item from each of two ports. The items can be of different type.

Choice: Execute a choice of two or more port-handler pairings

Interleave: Consists of a set of arbiters (port -- handler pairs) of 3 types that are Concurrent, Exclusive or Teardown (called at end for clean up). Concurrent arbiters are run concurrently but exclusive handlers are

http://msdn.microsoft.com/robotics/

PC07Intro [email protected]

50


Grids challenged by a web 2 0 and multicore sandwich

Rendezvous exchange as two shifts

Rendezvous exchange customized for MPI

Rendezvous Shift

Time Microseconds

Stages (millions)

Overhead (latency) of AMD 4-core PC with 4 execution threads on MPI style Rendezvous Messaging for Shift and Exchange implemented either as two shifts or as custom CCR pattern. Compute time is 10 seconds divided by number of stages


Grids challenged by a web 2 0 and multicore sandwich

Rendezvous exchange as two shifts

Rendezvous exchange customized for MPI

Rendezvous Shift

Time Microseconds

Stages (millions)

Overhead (latency) of INTEL 8-core PC with 8 execution threads on MPI style Rendezvous Messaging for Shift and Exchange implemented either as two shifts or as custom CCR pattern. Compute time is 15 seconds divided by number of stages


Grids challenged by a web 2 0 and multicore sandwich

Timing of HP Opteron Multicore as a function of number of simultaneous two-way service messages processed (November 2006 DSS Release)

CGL Measurements of Axis 2 shows about 500 microseconds – DSS is 10 times better

DSS Service Measurements

PC07Intro [email protected]

53


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