Parsing OSM XML iD OSMCha To-Fix Frontend Developer kepta - PowerPoint PPT Presentation

Mar 04, 2023 •139 likes •426 views

Parsing OSM XML iD OSMCha To-Fix Frontend Developer kepta kushan2020 Breaking down iD Breaking down iD 15% Rendering Painting 21% Javascript 64% HTML A sample of what iD is doing behind the scenes Breaking down JS 13% Draw Vector

Parsing OSM XML
iD OSMCha To-Fix Frontend Developer kepta kushan2020
Breaking down iD
Breaking down iD 15% Rendering Painting 21% Javascript 64% HTML A sample of what iD is doing behind the scenes
Breaking down JS 13% Draw Vector 42% GC 27% DOM Selector Parse XML Others 11%8%
Parsing XML eats up 25% of CPU Time
Solutions? • Stop parsing XML ?
Solutions? • Stop parsing XML ?
Solutions? • Stop parsing XML ? • Use clever techniques to defer the parsing of XML
Solutions? • Stop parsing XML ? • Use clever techniques to defer the parsing of XML
Solutions? • Stop parsing XML ? • Use clever techniques to defer the parsing of XML • Exploit the multi-core architecture of CPUs
Solutions? • Stop parsing XML ? • Use clever techniques to defer the parsing of XML • Exploit the multi-core architecture of CPUs
The Multi-threading Solution • Even the cheapest smartphone has at least two core for processing • Unlike UI, parsing can be easily o ffl oaded to a separate thread. • This will improve the response time and alleviate some of the pressure on main thread.
Browsers and Threads • Browser threads a.k.a web-workers do not   support DOM/XML
Browsers and Threads • Browser threads a.k.a web-workers do not   support DOM/XML • iD wasn’t written to be executed in a multi-threaded environment
Osm-Bizli • To circumvent the problem of not having DOM, I created a new library called Osm-Bizli . • It relies on string parsing of XML line by line. • It only understands the particular XML returned by the bbox API. • With these focused features, it is able to deliver impressive performance.
How does it work? We parse the XML line by line.
How does it work? For each Entity we create a corresponding blank object.
How does it work? The attributes are populated.
How does it work?
How does it work? We then move to next line
How does it work? If the line starts with <nd or <tag we fill our way object with it
How does it work? Whenever we encounter a closing tag, we save the object and start fresh with new line.
Takeaways
Takeaways • Multi-threading would improve the performance of iD • Osm-bizli uses string parsing of OSM-xml to overcome the limitations of web-workers. • Opens future possibility of o ffl oading more tasks to web- worker.
Thanks

Recommend

CSC 4181 Compiler Construction Parsing 1 1 Outline Top-down v.s. Bottom-up Top-down parsing

CSC 4181 Compiler Construction Parsing 1 1 Outline Top-down v.s. Bottom-up Top-down parsing Bottom-up parsing Recursive-descent Shift-reduce parsers parsing LR(0) parsing LL(1) parsing LR(0) items LL(1) parsing

429 views • 29 slides

Introduction to Bottom-Up Parsing Shift-reduce parsing The LR parsing algorithm

Outline Review LL parsing Introduction to Bottom-Up Parsing Shift-reduce parsing The LR parsing algorithm Constructing LR parsing tables 2 Top-Down Parsing: Review Top-Down Parsing: Review Top-down parsing expands a

471 views • 13 slides

Top-Down Parsing Slides modified from Louden Book and Dr. Scherger Top Down Parsing A

Compiler Design and Construction Top-Down Parsing Slides modified from Louden Book and Dr. Scherger Top Down Parsing A top-down parsing algorithm parses an input string of tokens by tracing out the steps in a leftmost derivation. Such an

1.12k views • 96 slides

Statistical Dependency Parsing in Korean: From Corpus Generation To Automatic Parsing Workshop on

Statistical Dependency Parsing in Korean: From Corpus Generation To Automatic Parsing Workshop on Statistical Parsing of Morphologically-Rich Languages 12th International Conference on Parsing Technologies Jinho D. Choi & Martha Palmer

199 views • 19 slides

Basic Parsing Algorithms Chart Parsing Seminar Recent Advances in Parsing Technology WS

Basic Parsing Algorithms Chart Parsing Seminar Recent Advances in Parsing Technology WS 2011/2012 Anna Schmidt Talk Outline Chart Parsing Basics Chart Parsing Algorithms Earley Algorithm CKY Algorithm Basics

1.12k views • 73 slides

Overview Introduction Lexicalized TAG, Advantages of parsing with LTAG Parsing LTAGs

Parsing with Lexicalized TAG (1) Extracting and comparing LTAG (2) Presentation by Philip John Gorinski Seminar Recent Advances in Parsing Technology Saarland University, Winter Term 2011/12 (1) Yves Shabes, Aravind K. Joshi, 1990 (2)

514 views • 36 slides

* 07/16/96 Plan for Today Shift-reduce parsing The problem with predictive top down parsing

* 07/16/96 Plan for Today Shift-reduce parsing The problem with predictive top down parsing CS453 : Shift Reduce Parsing LR parsing: bottom up Unambiguous Grammars LR(0) and SLR Parse Tables Performs a right-most derivation in

316 views • 6 slides

1 Determinism and Parsing The parsing problem is, given a string w and a context-free grammar G ,

1 Determinism and Parsing The parsing problem is, given a string w and a context-free grammar G , to decide if w L ( G ), and if so, to construct a derivation or a parse tree for w . Parsing is studied in courses in compilers. To be efficient

520 views • 12 slides

Bottom-up parsing LR parsing Construct parse tree for input from leaves up LR( k ) parsing

Bottom-up parsing LR parsing Construct parse tree for input from leaves up LR( k ) parsing reducing a string of tokens to single start symbol L eft-to-right scan of input, R ightmost derivation (inverse of deriving a string of tokens from

413 views • 5 slides

Bottom Up Parsing Also known as Shift-Reduce parsing More powerful than top down Dont

9/26/2012 Bottom Up Parsing Also known as Shift-Reduce parsing More powerful than top down Dont need left factored grammars Can handle left recursion Bottom Up Parsing Attempt to construct parse tree from an input string

655 views • 6 slides

Dependency Parsing & Feature-based Parsing Ling571 Deep Processing Techniques for NLP

Dependency Parsing & Feature-based Parsing Ling571 Deep Processing Techniques for NLP February 2, 2015 Roadmap Dependency parsing Graph-based dependency parsing Maximum spanning tree CLE Algorithm Learning

899 views • 87 slides

Statistical Parsing Parsing context-free languages ar ltekin University of Tbingen

Statistical Parsing Parsing context-free languages ar ltekin University of Tbingen Seminar fr Sprachwissenschaft November 8, 2016 Recap Parsing basics CKY Earley Closing Ingredients of a (natural language) parser .

1.17k views • 51 slides

Generalised Parsing and Combinator Parsing A Happy Marriage? L. Thomas van Binsbergen

Conventional Parser Combinators Aspects of Generalised Parsing Combinators for Generalised Parsing Generalised Parsing and Combinator Parsing A Happy Marriage? L. Thomas van Binsbergen ltvanbinsbergen@acm.org Royal Holloway, University of

452 views • 30 slides

Robust Incremental Neural Semantic Graph Parsing Jan Buys and Phil Blunsom Dependency Parsing vs

Robust Incremental Neural Semantic Graph Parsing Jan Buys and Phil Blunsom Dependency Parsing vs Semantic Parsing Dependency parsing models the syntactic structure between words in a sentence. Dependency Parsing vs Semantic Parsing

637 views • 31 slides

Statistical Parsing Dependency parsing ar ltekin University of Tbingen Seminar fr

Statistical Parsing Dependency parsing ar ltekin University of Tbingen Seminar fr Sprachwissenschaft November 2016 Recap/background Dependency grammar Dependency parsing Evaluation Summary Ingredients of a parser

1.44k views • 89 slides

Plan for Today Predictive parsing as a specific subclass of recursive descent parsing

Plan for Today Predictive parsing as a specific subclass of recursive descent parsing complexity comparisons with general parsing might have to left-factor necessary to remove left-recursion (MiniSVG modification as example) Working

346 views • 5 slides

Lectures 7 and 8. Parsing (syntax analysis) Wei Le 2015.9 Bottom Up Parsing Recognize many

Lectures 7 and 8. Parsing (syntax analysis) Wei Le 2015.9 Bottom Up Parsing Recognize many programming languages, used in practice More general, more powerful parser: less restrictions on grammars, e.g., can handle left-recursive grammar

680 views • 64 slides

LL1 Parsing a b $ S 1 A 4 B 3 2 a b b b 1. S --> a B

LL1 Parsing a b $ S 1 A 4 B 3 2 a b b b 1. S --> a B Input 2. B --> 3. B --> A S 4. A --> b B Parse Stack Compare Input and Stacktop 1 LL1 Parsing a b $ S 1 A

694 views • 17 slides

Programming Languages: Parsing Onur Tolga S ehito glu Computer Engineering,METU 27 May

Programming Languages:Parsing Programming Languages: Parsing Onur Tolga S ehito glu Computer Engineering,METU 27 May 2009 Programming Languages:Parsing Outline 1 Parsing Top-down Parsing Recursive Descent Parser LL Parsers

215 views • 8 slides

Models of Human Parsing Experimental Data 2 Informatics 2A: Lecture 22 Eye-tracking Reading

Human Parsing Human Parsing Experimental Data Experimental Data Bottom-Up Parser Bottom-Up Parser Left Corner Parser Left Corner Parser Human Parsing 1 Cognitive Constraints Garden Paths Dimensions of Parsing Models of Human Parsing

537 views • 9 slides

Top-Down Parsing Top-Down Parsing #1 Extra Credit Question Given this grammar G: E

Top-Down Parsing Top-Down Parsing #1 Extra Credit Question Given this grammar G: E E + T E T T T * int T int T ( E ) Is the string int * (int + int) in L(G)? Give a derivation or prove that it

1.08k views • 61 slides

CKY Parsing Ling 571 Deep Processing Techniques for NLP January 12, 2011 Roadmap

CKY Parsing Ling 571 Deep Processing Techniques for NLP January 12, 2011 Roadmap Motivation: Parsing (In) efficiency Dynamic Programming Cocke-Kasami-Younger Parsing Algorithm Chomsky Normal Form Conversion

689 views • 42 slides

Parsing Parsing involves: determining if a string belongs to a language, and

Parsing Parsing involves: determining if a string belongs to a language, and constructing structure of string if it belongs to language. Two approaches to constructing parsers: 1. Top down parsing: Our focus is on table-driven

428 views • 18 slides

Compiler Construction Lecture 7: Bottom-up parsing 2020-01-28 Michael Engel Includes material

Compiler Construction Lecture 7: Bottom-up parsing 2020-01-28 Michael Engel Includes material by Jan Christian Meyer and Rich Maclin (UNM) Overview Top-down parsing revisited Bottom-up parsing Comparison to top-down parsing

539 views • 20 slides