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DA2022

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Title: DAB723 - Databaser Author: a Last modified by: Marcus Edvinsson Created Date: 9/1/2002 10:39:07 AM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: DA2022

1
DA2022 Computer Architecture

Introduction to ZPL
Marcus Edvinsson
with slides originally made by
Morgan Ericsson

2
Today

Introduction to the assignments
The deal
The assignment
Introduction to ZPL
What is ZPL
Getting started
ZPL and lots of examples

3
The deal

Everything you need is on the course page or
linked to from the course page, except
/stud/kurser/da2022
I introduce the assignment and the different
techniques and environments and I also answer
your questions and correct/grade your (practical)
work/assignments

4
The assignments

Parallel programming
ZPL (today)
MPI (later)
Image manipulation
Grey-scale conversion
Histogram
Smoothing

5
PPM and PGM

Format used for images in this course
You should be able to load/save these formats
Very simple formats
ASCII readable (mostly)
Raw and ASCII (we like it raw!)
Uncompressed
Lots of available tools
NetPBM (/usr/local/netpbm)
XV (/usr/local/bin)
Etc (google!)

6
PPM and PGM

Format
MAGIC
Optional comment
WIDTH HEIGHT
MAXIMUM COLOR COMPONENT VALUE
Image data (RGB) HEIGHT WIDTH
Height, width, etc, ASCII formatted integers,
e.g., 640
Magic identifies the format, P5 PGM RAW, P6 PPM
RAW

7
Example

P6
CREATOR XV Version 3.10a Rev 12/29/94
720 480
255
OMNPNOQQQQSRMON MLNT RX \
" '''''""
''((''""!
"!"""!"!"""""""""
''''"!"'''
'''

8
ZPL

High-level, platform independent
Implicitly parallel
Can be run in parallel or sequentially
Array programming language
Operations can be applied to arrays (of any
dimension)

9
Getting started

ZPL is installed in the Unix lab rooms
Set the following environment variables
Set ZPLHOME to /opt/zplhome
Set ZPLCOMMLAYER to seq
Set ZPLTARGET to sparc-solaris
(Syntax depending on shell, use setenv if csh)
Or
Run /stud/kurser/da2022/instMPI
Then what?
Compiler is zc
Executables are named like the source, but
without .z

10
ZPL

Syntax very similar to Pascal (and Ada)
Please note
/ / comments
assignment, comparison

11
Example 1

program Ex1
procedure Ex1()
begin
writeln("Hello, world!")
end

12
Example 2

program Ex2
var
a,binteger
procedure Ex2()
begin
b10
aab
ab
writeln("a",a,".")
write("a0d.\n"a)
write("a0d"a, ", b0d.\n"b)
end

13
Example 3

program Ex3
var
a,b,iinteger
procedure Ex3()
begin
a0
for i1 to 5 do
ai
end
writeln(a)
end

14
Example 4

program Ex4
var
a,binteger
procedure Ex4()
begin
read(a)
read(b)
if altb then
writeln("altb")
elsif agtb then
writeln("agtb")
else
writeln("ab")
end
end

15
(Parallel) Arrays and Regions

Regions indices
Used to declare arrays or specify regions that
operations should operate on
Example
region R 1..10
a R integer
R a1
Not first-class objects!

16
Example 5

program Ex5
region R 1..10
var
a R integer
procedure Ex5()
begin
R a1
R write(a)
end

17
Example 6

program Ex6
region R 1..10
R2 3..6
var
a,b R integer
procedure Ex6()
begin
R a1
R bIndex1
R2 ab
R write(a)
end

18
Directions

Position-independent way of indexing arrays

19
Directions

Defined by giving rules for transforming an index
direction north -1, 0
Parallel arrays can not be indexed in other ways

20
Region Operators

Used to index/create new regions based on regions
and/or directions
Of, creates a new region relative to a region and
a direction
At (_at_), indexing (displacement) by direction
(can be used with variables as well)
In, creates a new region inside another region

21
Example 7