php 에서 파일 읽기 퍼포먼스 bench.

ITWeb/개발일반 2007. 9. 18. 11:10

Function	Time (s)		Memory (b)
	32Kb File	1Mb File	32Kb File	1Mb File
file_get_contents	0.00152	0.00564	52480	1067856
fpassthru	0.00117	0.00184	20016	20032
fgets	0.00195	0.07190	30760	30768
file	0.00157	0.06464	87344	2185624
require_once	0.00225	0.08065	67992	2067696
include	0.00222	0.08202	67928	2067624
readfile	0.00117	0.00191	19192	19208

ref. : http://www.raditha.com/wiki/Readfile_vs_include

:

Information Retrieval Resources

ITWeb/스크랩 2007. 9. 17. 16:49

ref. http://www-csli.stanford.edu/~hinrich/information-retrieval.html
ref. http://www-csli.stanford.edu/~hinrich/information-retrieval-book.html

Information Retrieval Resources

Information on Information Retrieval (IR) books, courses, conferences and other resources.

Books
Modern Information Retrieval. R. Baeza-Yates, B. Ribeiro-Neto. Addison-Wesley, 1999. Currently the most widely used and cited.
Information Retrieval: Algorithms and Heuristics. D.A. Grossman, O. Frieder. Springer, 2004. Excellent textbook, #1 or #2 seller on Amazon.
Managing Gigabytes. I.H. Witten, A. Moffat, T.C. Bell. Morgan Kaufmann, 1999. The authority on index construction and compression.
Mining the Web: Analysis of Hypertext and Semi Structured Data. S. Chakrabarti. Morgan Kaufmann, 2002. The best introduction for web-centric IR.
Finding Out About. R. Belew. Cambridge UP, 2001. More suitable for undergraduate classes than other books listed here.
Information Retrieval: A Health and Biomedical Perspective. W.R. Hersh. Springer, 2002. As the title says: a health/biomedical perspective.
TREC: Experiment and Evaluation in Information Retrieval. E.M. Voorhees, D.K. Harman. MIT Press, 2005. A survey of recent research results.
Language Modeling for Information Retrieval. W.B. Croft, J. Lafferty. Springer, 2003. Language models are of increasing importance in IR.
Readings in Information Retrieval. K. Sparck Jones, P. Willett. Morgan Kaufmann, 1997. A collection of classical IR papers.
Recommended Reading for IR Research Students. A. Moffat, J. Zobel, D. Hawking. SIGIR Forum, 39(2), 2005. Not a book, but a collection of seminal papers, more up-to-date than Sparck-Jones et al.
Modeling the Internet and the Web: Probabilistic Methods and Algorithms. P. Baldi, P. Frasconi, P. Smyth. Wiley, 2003. A bit terse. Recommended for those who have a good foundation in probability theory, but are new to IR.
Information Storage and Retrieval Systems. G. Kowalski, M.T. Maybury. Springer, 2005. "... takes a system approach, discussing all aspects of an Information Retrieval System."
The Geometry of Information Retrieval. C.J. van Risjbergen. Cambridge UP, 2004. Am ambitious attempt to develop quantum mechanics as a new foundation for IR.
Introduction to Modern Information Retrieval. G.G. Chowdhury. Neal-Schuman, 2003. Intended for students of library and information studies.
Text Information Retrieval Systems. C. Meadow, B. Boyce, D. Kraft. Academic Press, 2000. Also takes a library/information science perspective.
More Books

Free Online Books
Introduction to Information Retrieval. C.D. Manning, P. Raghavan, H. Schütze. Cambridge UP, 2007. Draft. Focuses on algorithms and mathematical foundations without neglecting practical issues in building search systems. Equal coverage of classical IR and newer topics like XML, machine learning techniques and web search engines.
Finding Out About. Hypertext edition of R. Belew's book (w/o figures).
Information Retrieval. C. J. van Rijsbergen. Butterworths, 1979. The classic. Almost 40 years old, but still worth reading.
Information Retrieval Interaction. P. Ingwersen. Taylor Graham, 1992. Focuses on user interaction in IR.
Information Retrieval: A Survey. Ed Greengrass. 2000. Good survey of "classical" IR, but little or no coverage of recent work (e.g., language models, PageRank, SVMs).
Information Retrieval. T. van der Weide. 2004. Introduction to IR and hypertext.

Research Centers
CMU (LTI)
Dublin CU
Geneva (Viper)
Glasgow
Helsinki Institute for Information Technology
IBM
Illinois Institute of Technology
Microsoft Research
NIST
Peking
Pittsburgh
Sheffield
UIUC
UMASS

Courses
Berkeley (SIMS)
CMU
Cornell
DePaul
IIT
Johns Hopkins I
Johns Hopkins II
Maryland
MPI
Princeton
Stanford
Stuttgart
Texas
UMASS

Problem Sets / Assignments
Bilkent
U. of Chile
DePaul
Georgetown
Tennessee

Web Information Retrieval
webir.org
Search Engine Watch
Users' Guide to Web Searching
PageRank

Subareas, Applications, Methods
Information Retrieval & Extraction
Information Retrieval & Machine Learning
Text Mining & Web Mining
INEX: XML retrieval
Geographic Information Retrieval
Music Information Retrieval
CLIR & Multilingual Information Retrieval
Cross-Language Information Retrieval (CLIR) Resources
N-Grams in Information Retrieval
Agent-based Information Retrieval
Audio Information Retrieval
Adversarial Information Retrieval

Conferences
TREC
Cross Language Evaluation Forum
SIGIR 2007 (last), SIGIR 2008 (next)
CIKM 2006, CIKM 2007
WWW 2007, WWW 2008
JCDL 2007, JCDL 2008
RIAO 2004, RIAO 2007
ECIR 2007, ECIR 2008
AIRS 2006, AIRS 2008
SPIRE 2006, SPIRE 2007
Norbert Fuhr's IR conference calendar

Journals
ACM Transactions on Information Systems (TOIS): dblp home
Information Processing and Management (IP&M): dblp home
Information Retrieval: dblp home
International Journal on Digital Libraries: dblp home
Journal of the American Society of Information Science and Technology (JASIST): dblp home
SIGIR Forum: dblp home
Journal of Documentation
D-Lib Magazine
Data & Knowledge Engineering: dblp home
Information Processing Letters: dblp home
Information Research
Information Systems: dblp home
Journal of Intelligent Information Systems: dblp home
Knowledge and Information Systems: dblp home
Foundations and Trends in Information Retrieval: home

Software
Doug Oard's list of available text retrieval systems
Avi Rappoport: open source search engines
MySQL full text search
Text to Matrix Generator, a MATLAB toolbox for indexing, retrieval and other text processing tasks

Collections
U. of Glasgow list of available text retrieval collections
NLP/IR corpus list at NUS
NLP/IR corpus list at Edinburgh
Internet archive (limited availability)
Linguistic Data Consortium

Professional Organizations
ACM SIGIR
BCS IRSG

Other Resources
Glossary (Modern Information Retrieval)
Information retrieval research links @ Search Tools
BUBL: Information Retrieval Links
LSU: Information Retrieval Systems
Open Directory: Information Retrieval Links
UBC: Indexing Resources
IR & Neural Networks, Symbolic Learning, Genetic Algorithms
A stop list (that is, a list of stop words)
Machine Learning and Information Retrieval (older collection of papers)
Chris Manning's NLP resources

2007.09.08

Back

:

code tables

ITWeb/개발일반 2007. 9. 10. 14:09

ref. http://www.unicode.org/charts/

character set 핸들링에 필요해서 북마크 해 봅니다.

:

DOM Client Object Cross-Reference:document

ITWeb/개발일반 2007. 9. 6. 00:06

DOM Client Object Cross-Reference:document

From MDC

Main Page > JS_GetContextPrivate > document

User Agent	Property	Read Only	Data Type	Default Value
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IE-6.0+	all	true	object	[object]
Opera-8.0+	all	true	function
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IE-6.0+	applets	true	object	[object]
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IE-6.0+	compatMode	true	string	[BackCompat \| CSS1Compat]
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Gecko-1.4+	designMode	true	string	off
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IE-6.0+	designMode	false	string	Off
IE-6.0+	detachEvent	true	function
Opera-8.0+	detachEvent	true	function
Gecko-1.0.1+	dir	true	string	ltr
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Gecko-1.7.8+	documentURI	true	string
Gecko-1.7.8+	domConfig	true	unknown
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Opera-8.0+	domain	false	string
IE-6.0+	elementFromPoint	true	function
Opera-8.0+	elementFromPoint	true	function
Gecko-1.0.1+	embeds	true	object	[object HTMLCollection]
IE-6.0+	embeds	true	object	[object]
Opera-8.0+	embeds	true	function
Gecko-1.0.1+	evaluate	true	function
Gecko-1.4+	execCommand	true	function
IE-6.0+	execCommand	true	function
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IE-6.0+	expando	false	boolean	true
Gecko-1.0.1+	fgColor	false	string
Gecko-1.4+	fgColor	false	string	#000000
IE-6.0+	fgColor	false	string	#000000
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IE-6.0+	fileCreatedDate	true	string	[depends on document]
IE-6.0+	fileModifiedDate	true	string	[depends on document]
IE-6.0+	fileSize	true	string	[depends on document]
IE-6.0+	fileUpdatedDate	unknown	unknown	unknown
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IE-6.0+	firstChild	true	object	[object]
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IE-6.0+	onrowenter	false	object	null
IE-6.0+	onrowexit	false	object	null
IE-6.0+	onrowsdelete	false	object	null
IE-6.0+	onrowsinserted	false	object	null
IE-6.0+	onselectionchange	false	object	null
IE-6.0+	onselectstart	false	object	null
IE-6.0+	onstop	false	object	null
Gecko-1.0.1+	open	true	function
IE-6.0+	open	true	function
Opera-8.0+	open	true	function
Gecko-1.0.1+	ownerDocument	true	object	null
IE-6.0+	ownerDocument	true	object	null
Opera-8.0+	ownerDocument	true	object	null
Gecko-1.0.1+	parentNode	true	object	null
IE-6.0+	parentNode	true	object	null
Opera-8.0+	parentNode	true	object	null
IE-6.0+	parentWindow	true	object	[object]
Opera-8.0+	parentWindow	true	object	[object Window]
Gecko-1.0.1+	plugins	true	object	[object HTMLCollection]
IE-6.0+	plugins	true	object	[object]
Opera-8.0+	plugins	true	function
Gecko-1.0.1+	prefix	true	object	null
Opera-8.0+	prefix	false	object	null
Gecko-1.0.1+	previousSibling	true	object	null
IE-6.0+	previousSibling	true	object	null
Opera-8.0+	previousSibling	true	object	null
IE-6.0+	protocol	false	string	[depends on document]
Gecko-1.4+	queryCommandEnabled	true	function
IE-6.0+	queryCommandEnabled	true	function
Gecko-1.4+	queryCommandIndeterm	true	function
IE-6.0+	queryCommandIndeterm	true	function
Gecko-1.4+	queryCommandState	true	function
IE-6.0+	queryCommandState	true	function
Gecko-1.4+	queryCommandSupported	true	function
IE-6.0+	queryCommandSupported	true	function
Gecko-1.4+	queryCommandText	true	function
Gecko-1.4+	queryCommandValue	true	function
IE-6.0+	queryCommandValue	true	function
IE-6.0+	readyState	true	string	[uninitialize \| loading \| loaded \| interactive \| complete]
Opera-8.0+	readyState	false	string	complete
IE-6.0+	recalc	true	function
Gecko-1.0.1+	referrer	true	string
IE-6.0+	referrer	true	string
Opera-8.0+	referrer	true	string
IE-6.0+	releaseCapture	true	function
Gecko-1.0.1+	releaseEvents	true	function
Opera-8.0+	releaseEvents	true	function
Gecko-1.0.1+	removeBinding	true	function
Gecko-1.0.1+	removeChild	true	function
Opera-8.0+	removeChild	true	function
Gecko-1.0.1+	removeEventListener	true	function
Opera-8.0+	removeEventListener	true	function
Gecko-1.7.8+	renameNode	true	function
Gecko-1.0.1+	replaceChild	true	function
Opera-8.0+	replaceChild	true	function
Gecko-1.0.1+	routeEvent	true	function
IE-6.0+	scripts	true	object	[object]
Opera-8.0+	scripts	true	function
IE-6.0+	security	true	string	This type of document does not have a security certificate.
IE-6.0+	selection	true	object	[object]
Opera-8.0+	selection	false	object	[object Selection]
IE-6.0+	setActive	true	function
Gecko-1.0.1+	setBoxObjectFor	true	function
Gecko-1.7.8+	setUserData	true	function
Gecko-1.7.8+	strictErrorChecking	false	boolean	true
Gecko-0.9.3+	styleSheets	true	object	[object StyleSheetList]
IE-6.0+	styleSheets	true	object	[object]
Gecko-1.7.8+	textContent	false	object	null
Gecko-1.0.1+	title	false	string
IE-6.0+	title	false	string	[depends on document]
Opera-8.0+	title	false	string
IE-6.0+	uniqueID	true	string
Gecko-1.0.1+	vlinkColor	false	string
Gecko-1.7.8+	vlinkColor	false	string	#551a8b
IE-6.0+	vlinkColor	false	string	#800080
Opera-8.0+	vlinkColor	false	string
Gecko-1.0.1+	width	true	number
Gecko-1.0.1+	write	true	function
IE-6.0+	write	true	function
Opera-8.0+	write	true	function
Gecko-1.0.1+	writeln	true	function
IE-6.0+	writeln	true	function
Opera-8.0+	writeln	true	function
Gecko-1.7.8+	xmlEncoding	true	object	null
Gecko-1.7.8+	xmlStandalone	true	boolean	false
Gecko-1.7.8+	xmlVersion	true	object	null

ref. http://developer.mozilla.org/en/docs/DOM_Client_Object_Cross-Reference:document

:

CSS Properties To JavaScript Reference Conversion

ITWeb/개발일반 2007. 9. 5. 13:33

CSS Property	JavaScript Reference
background	background
background-attachment	backgroundAttachment
background-color	backgroundColor
background-image	backgroundImage
background-position	backgroundPosition
background-repeat	backgroundRepeat
border	border
border-bottom	borderBottom
border-bottom-color	borderBottomColor
border-bottom-style	borderBottomStyle
border-bottom-width	borderBottomWidth
border-color	borderColor
border-left	borderLeft
border-left-color	borderLeftColor
border-left-style	borderLeftStyle
border-left-width	borderLeftWidth
border-right	borderRight
border-right-color	borderRightColor
border-right-style	borderRightStyle
border-right-width	borderRightWidth
border-style	borderStyle
border-top	borderTop
border-top-color	borderTopColor
border-top-style	borderTopStyle
border-top-width	borderTopWidth
border-width	borderWidth
clear	clear
clip	clip
color	color
cursor	cursor
display	display
filter	filter
font	font
font-family	fontFamily
font-size	fontSize
font-variant	fontVariant
font-weight	fontWeight
height	height
left	left
letter-spacing	letterSpacing
line-height	lineHeight
list-style	listStyle
list-style-image	listStyleImage
list-style-position	listStylePosition
list-style-type	listStyleType
margin	margin
margin-bottom	marginBottom
margin-left	marginLeft
margin-right	marginRight
margin-top	marginTop
overflow	overflow
padding	padding
padding-bottom	paddingBottom
padding-left	paddingLeft
padding-right	paddingRight
padding-top	paddingTop
page-break-after	pageBreakAfter
page-break-before	pageBreakBefore
position	position
float	styleFloat
text-align	textAlign
text-decoration	textDecoration
text-decoration: blink	textDecorationBlink
text-decoration: line-through	textDecorationLineThrough
text-decoration: none	textDecorationNone
text-decoration: overline	textDecorationOverline
text-decoration: underline	textDecorationUnderline
text-indent	textIndent
text-transform	textTransform
top	top
vertical-align	verticalAlign
visibility	visibility
width	width
z-index	zIndex

간혹 javascript css 를 handling 해야 해서 북마크 해 봅니다.
- IE/FF 에서 대소문자 구분 합니다.
예)
<style type="text/css">
body {
margin:0px;
font-size:12px;
line-height:2em;
}
</style>
to
<script language="javascript">
//<![CDATA[
document.body.style.margin = "0px";
document.body.style.fontSize = "12px";
document.body.style.lineHeight = "2em";
//]]>
</script>

ref. http://codepunk.hardwar.org.uk/css2js.htm

:

MySQL Users Conference Korea 2007

ITWeb/스크랩 2007. 9. 4. 14:28

ref : http://www.linuxdata.co.kr/mysql_event/index.html

국내 첫번째 MySQL Users Conference 가 열리내요.
무료니까 시간 되시는 분들은 참석해 보심이.. ^^*

Conference명	MySQL Users Conference Korea 2007
일시	2007년 9월14일 오후 1:00
위치	3,7호선 고속버스터미널역 강남센트럴시티 컨벤션 홀(체리홀)
입장료	무료

:

구글 코리아 입사 결정!!

ITWeb/스크랩 2007. 8. 28. 23:51

야후! 재미존 - 짤방공작소 [바로가기 클릭]

:

javascript programming conventions

ITWeb/개발일반 2007. 8. 23. 15:42

javascript programming conventions
http://dojotoolkit.org/developer/StyleGuide

최근에 Javascript for web 2.0 이라는 책을 보고 있는데 이 책에 소개된 최근 javascript coding style 에 대한 좋은 내용이 있길래 북마크 해 봅니다.

:

[PHP]tutorials.

ITWeb/개발일반 2007. 8. 22. 15:18

http://www.phpro.org/tutorials/?route=tutorials

정리가 깔끔하게 되어 있는 사이트 입니다.
이미 다 아는 사이트면 패스 ~~

http://www.php.net <-- 여긴 php 개발자면 기본이죠 ^^*

:

PHP Performance

ITWeb/개발일반 2007. 8. 22. 14:46

Reference Blog

PHP Performance

디렉토리나 파일은 가능한 짧게 유지 하라.
FollowSymLinks 옵션을 사용하라.
logging 은 한파일에 하고 분석시 logging 을 중지 하라.
KeepAliveTimeout 은 가능한 낮게 잡아라.
static / dynamic request 를 구분하라.
output buffering 은 브라우저의 rendering 을 빠르게 해준다.
- ob_start()
- output_buffering=on
- SendBufferSize = PageSize ( in apache )
- memory size 가 작은 시스템에서는 사용하지 말라.

for($i = 0; $i < 1000; $i++) { echo $i; }

This method is much slower than something like this:

ob_start(); for($i = 0; $i <1000; $i++) { echo $i; } ob_end_flush();

- 1.36509799957 without ob_start()
- .248747825623 with ob_start()
bandwidth optimization
- server 자원을 줄인다.
- client page load 를 빠르게 한다.
- network io 를 줄인다.
compression 은 cpu 의 3-5% 의 load 를 줄인다.
- apache 1 : mod_gzip
- apache 2 : mod_deflate
Tuning PHP Configuration
- register_globals = Off **
- magic_quotes_gpc = Off
- expose_php = Off
- register_argc_argv = Off
- always_populate_raw_post_data = Off **
- session.use_trans_sid = Off **
- session.auto_start = Off **
- session.gc_divisor = 1000 or 10000
- output_buffering = 4096
Tuning PHP File Access
- Inefficient Approach : < ? php include "file.php"; ? >
- Performance Friendly Approach : < ? php include "/path/to/file.php"; or include "./file.php"; ? >
Regular Expression
- Slow
  - if (preg_match("!^foo_!i", "FoO_")) { }
  - if (preg_match("![a8f9]!", "sometext")) { }
- Faster
  - if (strncasecmp("foo_", "FoO_", 4)) { }
  - if (strpbrk("a8f9", "sometext")) { }
Optimizing str_replace()
- replacement 할 필요가 없는 것들을 제거 하고 사용할것
  - 바꿔야 할 문자열과 대치해야할 문자열 중 필요 없는건 제거 할것
strtr() vs str_replace()
- str_replace 가 strtr 보다 10배 정도 빠르다.
fopen() vs file_get_contents()
- file_get_contents() 가 훨씬 간단하고 빠르다.
쓰면 유용한 함수들
- file_put_contents()
  - Append data to files or create new files in one shot.
- microtime() and gettimeofday()
  - Return floats when passed TRUE as a 1st argument.
- mkdir()
  - Can create directory trees, when 2nd arg. is TRUE.
- glob()
  - Fetch all array of files/directories in one shot.
- convert_uuencode,convert_uudecode
  - Fast UU encoding/decoding mechanism.
- http_build_query()
  - Build GET/POST query based on associated array.
- substr_compare()
  - strcmp/strncasecmp/etc… from an offset.
- array_walk_recursive()
  - Recursively iterate through an array.
- convert_uuencode,convert_uudecode
  - Fast UU encoding/decoding mechanism.
- http_build_query()
  - Build GET/POST query based on associated array.
- substr_compare()
  - strcmp/strncasecmp/etc… from an offset.
- array_walk_recursive()
  - Recursively iterate through an array.
Multi-dimensioal Array trick
- slow 2 extra hash lookups per access
  - $a['b']['c'] = array();
  - for($i = 0; $i < 5; $i++) $a['b']['c'][$i] = $i;
- much faster reference based approach
  - $ref =& $a['b']['c'];
  - for($i = 0; $i < 5; $i++) $ref[$i] = $i;
Static 선언은 50-75% 의 성능 향상을 준다.
불필요한 wrapper 를 제거 한다.
The simpler the code, the faster it runs, it really is that simple.
string concatenation
- echo ''; 보다 echo ''; 가 일반적이다.

include nested-looping 사용에 대한 주의

main
require_once
  php_self
require_once (2x)
  session_is_registered
  require_once
require_once
  require_once (3x)
    require_once (2x)
  require_once
    require_once
      require_once
        require_once
          is_array
          use_plugin
            file_exists
            include_once
            function_exists
            ... etc

As you can see, a require_once was performed and inside that a php_self was executed. Then another require_once executed session_is_registered, followed by another require_once and so on. Basically, the function call tree is like a little window into the Zend Engine, allowing you to watch the sequence of events that take place when your Web application is run.

If you do much object-oriented development, you may find that you rapidly lose track of what's actually going on inside some classes and methods. It's tempting to think of classes as a black box, because that's how we're taught to use them. But, when optimizing a complex Web application, you need to know what's actually going on inside each one, or you may have performance bottlenecks you do not even notice.

Avoid repeated function calls
- for ( $i=0; $i<count($aArray); $i++ ) {} : bad
- $nCnt = count($aArray); for ( $i=0; $i<$nCnt; $i++ ) {} : good
string concatenation
- sprintf 보다 plain string concatenation 이 두배 정도 빠르다.
print() 대신 echo 를 사용 하라.
string 표현은 signle quotes 를 사용 하라.
Reduces Number Of System Calls (Optimizes PHP<->OS Communication)

invalid-file

:

jjeong

'ITWeb'에 해당되는 글 798건

php 에서 파일 읽기 퍼포먼스 bench.

Information Retrieval Resources

ref. http://www-csli.stanford.edu/~hinrich/information-retrieval.html
ref. http://www-csli.stanford.edu/~hinrich/information-retrieval-book.html

Information Retrieval Resources

code tables

DOM Client Object Cross-Reference:document