Created: (STDCXX-231) std::getline from <string> header is rather slow

Thread: Created: (STDCXX-231) std::getline from header is rather slow

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Created: (STDCXX-231) std::getline from <string> header is rather slow
	2006-06-28 18:40:29
std::getline from <string> header is rather slow ------------------------------------------------ Key: STDCXX-231 URL: http: //issues.apache.org/jira/browse/STDCXX-231 Project: C++ Standard Library Type: Improvement Components: 21. Strings Reporter: Martin Sebor Moved from the Rogue Wave bug tracking database: **Created By: leroy Jan 25, 2001 03:20:01 PM Environment Compiler : SUNPRO 4.2 OS : Solaris 2.5.1 SCL : 1.3.0 (Summer-1999) Tools : 7.1.0 (Summer-1999) --> Use only for RWBench Command line option : for debug : CC -xildoff +w +p -g -o Test_dbg.exe test.cc -DRWDEBUG=1 -I/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 11s -I/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 11s/include -I. -L/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 11s/lib -Bstatic -ltls11s -lstd11s -Bdynamic for release : CC -xildoff +w +p -fast -o Test_release.exe test.cc -I/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 8s -I/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 8s/include -I. -L/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 8s/lib -Bstatic -ltls8s -lstd8s -Bdynamic (Uploaded file: 997149-test.cc) Entered By: Web Thursday, January 25, 2001 2:41:42 AM Location of uploaded file: http://thoth.bco.roguewave.com/uploads/997149-test.cc View all uploaded files for this incident: http://webdev.roguewave.com/admin/tsvw/index.c fm?IncidentID=997149 Entered By: Web Thursday, January 25, 2001 2:44:56 AM #web Please find my test case at the end of the note Environment Compiler : SUNPRO 4.2 OS : Solaris 2.5.1 SCL : 1.3.0 (Summer-1999) Tools : 7.1.0 (Summer-1999) --> Use only for RWBench Command line option : for debug : CC -xildoff +w +p -g -o Test_dbg.exe test.cc -DRWDEBUG=1 -I/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 11s -I/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 11s/include -I. -L/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 11s/lib -Bstatic -ltls11s -lstd11s -Bdynamic for release : CC -xildoff +w +p -fast -o Test_release.exe test.cc -I/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 8s -I/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 8s/include -I. -L/opt/RogueWave/Summer-1999/workspaces/SOLARIS251/SUNPRO42/ 8s/lib -Bstatic -ltls8s -lstd8s -Bdynamic #Code #include <string> #include <fstream.h> #include <iostream.h> #include <rw/bench.h> class std_string_getline : public RWBench { public: std_string_getline() {;} void doLoop(unsigned long n); void idleLoop(unsigned long n); void what(ostream& os) const { os << "Standard String Getline : " << endl;} }; class classic_getline : public RWBench { public: classic_getline() {;} void doLoop(unsigned long n); void idleLoop(unsigned long n); void what(ostream& os) const { os << "Classic Getline : " << endl;} }; int main(int argc, char argv) { std_string_getline test_std_string; test_std_string.parse(argc, argv); test_std_string.go(); test_std_string.report(cout); classic_getline test_classic_getline; test_classic_getline.parse(argc, argv); test_classic_getline.go(); test_classic_getline.report(cout); } void std_string_getline::doLoop(unsigned long n) { while (n--) { ifstream toRead(__FILE__); string line; line.reserve(512); while (!(toRead.eof())) { getline(toRead, line, '\n'); } } } void std_string_getline::idleLoop(unsigned long n) { while (n--) { ifstream toRead(__FILE__); string line; line.reserve(512); } } void classic_getline::doLoop(unsigned long n) { while (n--) { ifstream toRead(__FILE__); char cLine[512]; string line; line.reserve(512); while (!(toRead.eof())) { toRead.getline(cLine, 512); line = cLine; } } } void classic_getline::idleLoop(unsigned long n) { while (n--) { ifstream toRead(__FILE__); char cLine[512]; string line; line.reserve(512); } } #EndCode There appears to be something to this. I ran the program and here is the output: Sun C++ Standard String Getline : Iterations: 1 Inner loop operations: 1000 Total operations: 1000 Elapsed (user) time: 18.18 Operations per second: 55.0055 Sun C++ Classic Getline : Iterations: 5 Inner loop operations: 1000 Total operations: 5000 Elapsed (user) time: 4.67 Kilo-operations per second: 1.07066 -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atl assian.com/software/jira

Commented: (STDCXX-231) std::getline from <string> header is rather slow
United States	2007-10-23 12:37:50
[ HTTPS://ISSUES.APACHE.ORG/JIRA/BROWSE/STDCXX-231?PAGE=COM.AT LASSIAN.JIRA.PLUGIN.SYSTEM.ISSUETABPANELS:COMMENT-TABPANEL#A CTION_12537089 ] MARK BROWN COMMENTED ON STDCXX-231: ----------------------------------- I JUST BENCHMARKED GETLINE() FROM STDCXX 4.1.3 AGAINST THE SAME FUNCTION IN GCC 4.1 (THE PROGRAM IS BELOW), AND OUT OF CURIOSITY AGAINST THE WC UTILITY ON LINUX. STDCXX IS MORE THAN TWICE SLOWER THAN GCC, AND NEARLY TEN TIMES SLOWER THAN WC.THE TIMINGS FOR A 32MB TEXT FILE ARE: $ LS -L INPUT.TXT && TIME LD_LIBRARY_PATH=../LIB ./GETLINE 1 INPUT.TXT && TIME ./A.OUT 1 INPUT.TXT && TIME WC -L INPUT.TXT && CAT GETLINE.CPP -RW-RW-R-- 1 MBROWN MBROWN 32942720 OCT 23 11:30 INPUT.TXT 892370 REAL 0M0.433S USER 0M0.400S SYS 0M0.036S 892370 REAL 0M0.149S USER 0M0.124S SYS 0M0.024S 892370 INPUT.TXT REAL 0M0.053S USER 0M0.048S SYS 0M0.004S #INCLUDE <STDIO.H> #INCLUDE <STDLIB.H> #INCLUDE <FSTREAM> #INCLUDE <STRING> INT MAIN (INT ARGC, CHAR ARGV[]) { UNSIGNED LONG LOOPS; CONST CHAR FILE; LOOPS = 1 < ARGC ? STRTOUL (ARGV [1], 0, 0) : 1; FILE = 2 < ARGC ? ARGV [2] : __FILE__; UNSIGNED LONG LINE_COUNT = 0; STD::STRING LINE; FOR (UNSIGNED LONG I = 0; I != LOOPS; ++I) { STD::IFSTREAM IN (FILE); IF (!IN.IS_OPEN ()) RETURN 1; WHILE (STD::GETLINE (IN, LINE)) ++LINE_COUNT; } PRINTF ("%LUN", LINE_COUNT); } > STD::GETLINE FROM <STRING> HEADER IS RATHER SLOW > ------------------------------------------------ > > KEY: STDCXX-231 > URL: HTTPS://ISSUES.APACHE.ORG/JIRA/BROWSE/STDCXX-231 > PROJECT: C++ STANDARD LIBRARY > ISSUE TYPE: IMPROVEMENT > COMPONENTS: 21. STRINGS > REPORTER: MARTIN SEBOR > > MOVED FROM THE ROGUE WAVE BUG TRACKING DATABASE: > **CREATED BY: LEROY JAN 25, 2001 03:20:01 PM > ENVIRONMENT > COMPILER : SUNPRO 4.2 > OS : SOLARIS 2.5.1 > SCL : 1.3.0 (SUMMER-1999) > TOOLS : 7.1.0 (SUMMER-1999) --> USE ONLY FOR RWBENCH > COMMAND LINE OPTION : > FOR DEBUG : > CC -XILDOFF +W +P -G -O TEST_DBG.EXE TEST.CC -DRWDEBUG=1 -I/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 11S -I/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 11S/INCLUDE -I. -L/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 11S/LIB -BSTATIC -LTLS11S -LSTD11S -BDYNAMIC > FOR RELEASE : > CC -XILDOFF +W +P -FAST -O TEST_RELEASE.EXE TEST.CC -I/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 8S -I/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 8S/INCLUDE -I. -L/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 8S/LIB -BSTATIC -LTLS8S -LSTD8S -BDYNAMIC > (UPLOADED FILE: 997149-TEST.CC) > ENTERED BY: WEB THURSDAY, JANUARY 25, 2001 2:41:42 AM > LOCATION OF UPLOADED FILE: > HTTP://THOTH.BCO.ROGUEWAVE.COM/UPLOADS/997149-TEST.CC > VIEW ALL UPLOADED FILES FOR THIS INCIDENT: > HTTP://WEBDEV.ROGUEWAVE.COM/ADMIN/TSVW/INDEX.CFM?INCIDENTID= 997149 > ENTERED BY: WEB THURSDAY, JANUARY 25, 2001 2:44:56 AM > #WEB > PLEASE FIND MY TEST CASE AT THE END OF THE NOTE > ENVIRONMENT > COMPILER : SUNPRO 4.2 > OS : SOLARIS 2.5.1 > SCL : 1.3.0 (SUMMER-1999) > TOOLS : 7.1.0 (SUMMER-1999) --> USE ONLY FOR RWBENCH > COMMAND LINE OPTION : > FOR DEBUG : > CC -XILDOFF +W +P -G -O TEST_DBG.EXE TEST.CC -DRWDEBUG=1 -I/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 11S -I/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 11S/INCLUDE -I. -L/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 11S/LIB -BSTATIC -LTLS11S -LSTD11S -BDYNAMIC > FOR RELEASE : > CC -XILDOFF +W +P -FAST -O TEST_RELEASE.EXE TEST.CC -I/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 8S -I/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 8S/INCLUDE -I. -L/OPT/ROGUEWAVE/SUMMER-1999/WORKSPACES/SOLARIS251/SUNPRO42/ 8S/LIB -BSTATIC -LTLS8S -LSTD8S -BDYNAMIC > #CODE > #INCLUDE <STRING> > #INCLUDE <FSTREAM.H> > #INCLUDE <IOSTREAM.H> > #INCLUDE <RW/BENCH.H> > > > CLASS STD_STRING_GETLINE : PUBLIC RWBENCH > { > PUBLIC: > STD_STRING_GETLINE() {;} > > VOID DOLOOP(UNSIGNED LONG N); > VOID IDLELOOP(UNSIGNED LONG N); > VOID WHAT(OSTREAM& OS) CONST { OS << "STANDARD STRING GETLINE : " << ENDL;} > }; > > CLASS CLASSIC_GETLINE : PUBLIC RWBENCH > { > PUBLIC: > CLASSIC_GETLINE() {;} > > VOID DOLOOP(UNSIGNED LONG N); > VOID IDLELOOP(UNSIGNED LONG N); > VOID WHAT(OSTREAM& OS) CONST { OS << "CLASSIC GETLINE : " << ENDL;} > }; > > INT > MAIN(INT ARGC, CHAR ARGV) > { > > STD_STRING_GETLINE TEST_STD_STRING; > TEST_STD_STRING.PARSE(ARGC, ARGV); > TEST_STD_STRING.GO(); > TEST_STD_STRING.REPORT(COUT); > > CLASSIC_GETLINE TEST_CLASSIC_GETLINE; > TEST_CLASSIC_GETLINE.PARSE(ARGC, ARGV); > TEST_CLASSIC_GETLINE.GO(); > TEST_CLASSIC_GETLINE.REPORT(COUT); > } > > VOID > STD_STRING_GETLINE:OLOOP(UN SIGNED LONG N) > { > WHILE (N--) > { > IFSTREAM TOREAD(__FILE__); > STRING LINE; > LINE.RESERVE(512); > > WHILE (!(TOREAD.EOF())) > { > GETLINE(TOREAD, LINE, 'N'); > } > } > } > > VOID > STD_STRING_GETLINE::IDLELOOP(UNSIGNED LONG N) > { > WHILE (N--) > { > IFSTREAM TOREAD(__FILE__); > STRING LINE; > LINE.RESERVE(512); > } > } > > VOID > CLASSIC_GETLINE:OLOOP(UN SIGNED LONG N) > { > WHILE (N--) > { > IFSTREAM TOREAD(__FILE__); > CHAR CLINE[512]; > STRING LINE; > LINE.RESERVE(512); > > WHILE (!(TOREAD.EOF())) > { > TOREAD.GETLINE(CLINE, 512); > LINE = CLINE; > } > } > } > > VOID > CLASSIC_GETLINE::IDLELOOP(UNSIGNED LONG N) > { > WHILE (N--) > { > IFSTREAM TOREAD(__FILE__); > CHAR CLINE[512]; > STRING LINE; > LINE.RESERVE(512); > } > } > #ENDCODE > THERE APPEARS TO BE SOMETHING TO THIS. I RAN THE PROGRAM AND HERE IS THE OUTPUT: > SUN C++ > STANDARD STRING GETLINE : > ITERATIONS: 1 > INNER LOOP OPERATIONS: 1000 > TOTAL OPERATIONS: 1000 > ELAPSED (USER) TIME: 18.18 > OPERATIONS PER SECOND: 55.0055 > SUN C++ > CLASSIC GETLINE : > ITERATIONS: 5 > INNER LOOP OPERATIONS: 1000 > TOTAL OPERATIONS: 5000 > ELAPSED (USER) TIME: 4.67 > KILO-OPERATIONS PER SECOND: 1.07066 -- THIS MESSAGE IS AUTOMATICALLY GENERATED BY JIRA. - YOU CAN REPLY TO THIS EMAIL TO ADD A COMMENT TO THE ISSUE ONLINE.

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