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Introduction Name: Jani Peusaari Office: 6608 Contact: Email: Jani.Peusaari @lut.fi Reception hours: Tuesday 13-14

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Introduction. Name: Jani Peusaari Office: 6608 Contact: Email: Jani.Peusaari @lut.fi Reception hours: Tuesday 13-14. Timetable. wk 1: Introduction, terms, other basic stuff wk 2: Complexity analysis wk 3: Abstract models wk 4: Abstract models, architectures - PowerPoint PPT Presentation

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Page 1: Introduction

Introduction

Name: Jani Peusaari

Office: 6608

Contact:

Email: [email protected]

Reception hours: Tuesday 13-14

mailto:[email protected]
mailto:[email protected]
Page 2: Introduction

Timetable

wk 1: Introduction, terms, other basic stuffwk 2: Complexity analysiswk 3: Abstract modelswk 4: Abstract models, architectureswk 5: Interconnections, embeddingwk 6: Communicationswk 7: Practical issues, Los grande

coding assignment

Page 3: Introduction

Application areas

YOU TELL US

Page 4: Introduction

Terms

• Task – Tehtävä– General description of a processing element

• Process – Prosessi– A process runs in some arbitrary computer

• Thread – Säie– ”Lightweight process”, threads run in some

arbitrary process

• Communication– Between tasks, processes, threads

Page 5: Introduction

Terms

• Shared Memory – Jaettu muisti• Distributed Memory – Hajautetty muisti• Architecture

– Way to connect Processors to each other

• Problem size: n, N• Number of tasks: p, P• Memory: m, M• Time to complete certain operation: t, T

Page 6: Introduction

Example 1

The job is to estimate how long it takes to count n numbers with p people, One person calculates n numbers in (n-1)tc. Let us presume, that there are eight persons and the numbers are easily divided among them. Transferring the results takes tw. How long it takes for n people if:

a) They are sitting in a circle b) They are sitting in 2 by 4 rows.

Page 7: Introduction
Page 8: Introduction
Page 9: Introduction

Example 2

One person uses (n-1)tc to count n numbers. Is it possible that p persons solves the problem in less time than

(n-1)tc/p ?

Justify your answer !

Page 10: Introduction

Example 3

What if the eight people from assignment number 1 calculate partial sums on the blackboard so that everyone can see the others results as soon as they are ready.

How long a time it takes now and how about assignment number 2?


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