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CSE333, Winter 2021 L05: C Stream Processing C Stream Processing CSE 333 Winter 2021 C Stream Processing CSE 333 Winter 2021 Instructor: John Zahorjan Teaching Assistants: Matthew Arnold Nonthakit Chaiwong Jacob Cohen Elizabeth Haker Henry Hung Chase Lee Leo Liao Tim Mandzyuk Benjamin Shmidt Guramrit Singh

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Page 1: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

C Stream ProcessingCSE 333 Winter 2021C Stream ProcessingCSE 333 Winter 2021

Instructor: John Zahorjan

Teaching Assistants:

Matthew Arnold Nonthakit Chaiwong Jacob Cohen

Elizabeth Haker Henry Hung Chase Lee

Leo Liao Tim Mandzyuk Benjamin Shmidt

Guramrit Singh

Page 2: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Stream Processing Design

Not

Instead, many smaller pieces

2

Input Output

Input Output

“filters”

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CSE333, Winter 2021L05: C Stream Processing

Example: gcc

Not

Instead, many smaller pieces

3

Preprocess / compile / linkInput Output

Input OutputPre Comp Link

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CSE333, Winter 2021L05: C Stream Processing

Components / Apps We try to build components that are re-usable

We build apps by composing components

The operating system and shell provide mechanisms that help with this

Output redirection Input Redirectioncomp_1 >some_file comp_2 <some_file

Pipescomp_1 | comp_2 | comp_3

This view/style admittedly is most obviously compelling when data can be represented using text

4

Page 5: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Processing a Stream

A stream is a linear flow of data Process the data as it arrives, rather than reading all data before

processing

The C compiler was originally, at least, able to stream process• Declare before use…

5

vs.

Page 6: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Data sources and streams Keyboard

A sequence of keystrokes

Usually no data available to your program until user hits enter• There’s a way for you to ask OS to pass every key press on to you

Files Arrays of bytes

Overwhelming default is to read bytes in order• Can jump around in bytes if you must

Network It’s a wire, or it’s a radio way

Data arrives a bit at a time, in order

“Conversations” are sequences of messages

Graphical interfaces A sequence of clicks

6

Page 7: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

State Machines and Streams

“State machines” are often useful abstractions for stream processing Application is in some state

Each input token causes a state transition

Associated with each transition is some action

(CSE 311)

The state machine’s input is a sequence of symbols … a stream

7

Page 8: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Graphical Representation of State Machine

Read input one character at a time

Classify each input character whitespace (ws) or non-whitespace (non-ws) or EOF

In each state there is a transition for each input token type (symbol)

Each transition identifies the next state and an optional action

8

odd even

non-ws /

ws

ws /

non-ws /

non-ws /ws /

Goal: print all “words” in input stream that have an odd number of characters

ws / print word

done

EOF /EOF / EOF / print word

T H R E E F O U R

Page 9: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Matrix Representation of State Machine

9

odd even

non-ws /

ws

ws /

non-ws /

non-ws /ws /

ws / print word

done

EOF /EOF /

ws non-ws EOF

ws ws odd done

odd ws even done

even ws odd done

CurrentState

Input Symbol

Transition Matrix

Page 10: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Larger Example: Words with all vowels in order

abietineous

abstemious

abstemiously

abstemiousness

abstentious

...

10

...abiogenousabiogenyabiologicalabiologicallyabiologyabiosesabiosisabioticabioticalabioticallyabiotrophicabiotrophyAbipon...

/usr/share/dict/words Program Output

Program

Page 11: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

“Undisciplined Implementation”

1st problem – how to accumulate characters in a word?

11

#include <stdio.h>#include <ctype.h>

#define MAX_WORD_SIZE 100char word[MAX_WORD_SIZE];int word_index = 0;

void addChar(char c){

word[word_index] = c;word_index = (word_index+1) % MAX_WORD_SIZE;

}

How good an idea is this?

Page 12: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Undisciplined (cont.)

12

int main(int argc, char *argv[]){

char next_char = getchar();while ( next_char != EOF )

{word_index = 0;while ( isspace(next_char) )

next_char = getchar();while ( !isspace(next_char) && tolower(next_char) != 'a' && next_char != EOF )

{addChar(next_char);next_char = getchar();

}while ( !isspace(next_char) && tolower(next_char) != 'e' && next_char != EOF )

{addChar(next_char);next_char = getchar();

}...

Page 13: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Undisciplined (last)

13

...while ( !isspace(next_char) && tolower(next_char) != 'u' && next_char != EOF )

{addChar(next_char);next_char = getchar();

}if ( tolower(next_char) == 'u' )

{while ( !isspace(next_char) && next_char != EOF )

{addChar(next_char);next_char = getchar();

}// print_wordaddChar('\0');printf("%s\n", word);

}} // end of while (next_char != EOF) loop

Page 14: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

State Machine Version

14

none a e i o

‘e’ ‘i’ ‘o’ ‘u’

ws / print word

u

‘a’

All non-wsother

ws

I haven’t shown all actions.Additionally, EOF in any state signals end of execution.

ws

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CSE333, Winter 2021L05: C Stream Processing

State Machine Implementation Step 1 Represent state machine as a matrix

15

noneae…

u

ws a e …. EOF

{..} {..} {..} {..}…{..} {..} {..} {..}…

{..} {..} {..} {..}…

…

struct {next_state;action;

}{..} {..} {..} {..}…

currentstate

next input symbol

Page 16: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Example input: “anew ” current_state = none

input token = a

16

noneae…

u

ws a e …. EOF

{..} {..} {..} {..}…{..} {..} {..} {..}…

{..} {..} {..} {..}…

…

struct {next_state = a;action = push_char();

}

{..} {..} {..} {..}…

Page 17: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Example input: “anew ” current_state = a

input token = n

17

noneae…

u

ws a e …. EOF

{..} {..} {..} {..}…{..} {..} {..} {..}…

{..} {..} {..} {..}…

…

struct {next_state = a;action = push_char();

}

{..} {..} {..} {..}…

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CSE333, Winter 2021L05: C Stream Processing

Example input: “anew ” current_state = a

input token = e

18

noneae…

u

ws a e …. EOF

{..} {..} {..} {..}…{..} {..} {..} {..}…

{..} {..} {..} {..}…

…

struct {next_state = e;action = push_char();

}

{..} {..} {..} {..}…

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CSE333, Winter 2021L05: C Stream Processing

Example input: “anew ” current_state = e

input token = w

19

noneae…

u

ws a e …. EOF

{..} {..} {..} {..}…{..} {..} {..} {..}…

{..} {..} {..} {..}…

…

struct {next_state = e;action = push_char();

}

{..} {..} {..} {..}…

Page 20: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Example input: “anew ” current_state = e

input token = ‘ ‘

20

noneae…

u

ws a e …. EOF

{..} {..} {..} {..}…{..} {..} {..} {..}…

{..} {..} {..} {..}…

…

struct {next_state = none;action = reset_word();

}

{..} {..} {..} {..}…

Page 21: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Implementation in C Example code will be pushed to your repository

21

typedef enum state_enum{state_none,state_a,state_e,state_i,state_o,state_u,NUM_STATES,state_done

} State;

typedef enum char_class_enum{char_ws,char_a,char_e,char_i,char_o,char_u,char_non_ws,char_EOF,NUM_CHAR_CLASS

} CharClass;

Page 22: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

State Machine is Data

22

Transition transition_matrix[NUM_STATES][NUM_CHAR_CLASS] ={{ // state_none{state_none, NULL}, // char_ws{state_a, System_addchar}, // char_a{state_none, System_addchar}, // char_e{state_none, System_addchar}, // char_i{state_none, System_addchar}, // char_o{state_none, System_addchar}, // char_u{state_none, System_addchar}, // char_non_ws{state_done, NULL }, // char_eof},{ // state_a{state_none, System_resetWord},{state_a, System_addchar},{state_e, System_addchar},{state_a, System_addchar},{state_a, System_addchar},{state_a, System_addchar},{state_a, System_addchar},{state_done, NULL}},

…

typedef struct transition_t {State next_state;ActionFunction action;

} Transition;

typedef void (*ActionFunction)(System*);

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CSE333, Winter 2021L05: C Stream Processing

Complexity is Encoded in Data (Matrix)int main(int argc, char *argv[]) {

System system;

ActionFunction action;

System_initialize(&system);

while (system.current_state != state_done ) {

system.next_char = getchar();

system.next_char_class = classifyChar(system.next_char);

action = transition_matrix[system.current_state][system.next_char_class].action;

if ( action != NULL ) action(&system);

system.current_state =

transition_matrix[system.current_state][system.next_char_class].next_state;

}

return EXIT_SUCCESS;

}

23

Page 24: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Support for Stream Processing

You might imagine that reading the input character by character is slow

24

Your code getchar OS disk

procedurecall

systemcall

physicalI/O

Not to scale

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CSE333, Winter 2021L05: C Stream Processing

Support for Stream Processing: “inlining”

Some standard library routines are macros

25

getchar OS disk

systemcall

physicalI/O

Not to scale

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CSE333, Winter 2021L05: C Stream Processing

Support for Stream Processing: OS caching

The OS reads a substantial amount of data and caches it

26

getchar OS disk

systemcall

physicalI/O

Not to scale

Page 27: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Support for Stream Processing: libc caching

If you use the FILE* interface, libc reads big pieces and caches them

27

getchar OS disk

procedurecall

systemcall

physicalI/O

Not to scale

Page 28: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Support for Stream Processing: app caching

Some apps read big pieces and cache them They sometimes write their own getchar() equivalents

28

OS disk

procedurecall

systemcall

physicalI/O

Not to scale

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CSE333, Winter 2021L05: C Stream Processing

Support for Stream Processing: C File Interfaces

C provides 2 file interfaces

Library interface - <stdio.h> Formatted operations: printf, scanf, fopen, fclose

• FILE* infile = fopen(“myfile”, “r”);

Also unformatted operations: fread, fwrite

libc buffers for you

System call interface int fin = open(“myfile”, O_RDONLY);

ssize_t nread = read(fin, buffer, buffer_size);

No format conversion, just read/write buffers of bytes

29

Page 30: ^ u W } ] v P · 2021. 1. 27. · ^ u W } ] v P> ì ñ W ^ u W } ] v P ^ ï ï ï U t ] v î ì î ... Microsoft PowerPoint - 05-C-stream-processing.pptx Author: zahor Created Date:

CSE333, Winter 2021L05: C Stream Processing

Summary

Apps from Components Filters

Stream Processing Structure

State Machine Implementation Approach ex05 is out

Efficient Reading of Streams Requires Big Reads and Possibly Caching C’s FILE* interfaces do just that

C’s file handle (int) interfaces don’t

30


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