Why Programs Fail - Observing Facts ߊ಴੗ : ޙഅ҃ ([email protected]) ߊ಴ੌ : 2007֙ 4ਘ 16ੌ 

Table of contents Observing Facts Log Interactive Debugging Post-mortem Debugging Query Event Visualization 

Observing Facts ҳ୓੸ੋ प೯ীࢲ ੌযաח ࢎपٜ(Facts)ܳ ҙ଴ (Observing) оࢸҗ ো৉ਸ ా೧ࢲ ঳਷ ௏٘ߧਤ੄ Ѿҗܳ ҙ଴ ҙ଴੄ ਗ஗ рࢼೞ૑ ݈ইঠ ೠ׮. ޖ঺ਸ ঱ઁ ҙ଴ೡ Ѫੋ૑ ঌইঠ ೠ׮ ୓҅੸ਵ۽ ૓೯ೞۄ ҙ଴ ߑߨ Log Interactive Debugging Post-mortem Debugging 

Log ೐۽Ӓ۔੉ ࢎपਸ ୹۱ೞח ߑߨ ٣ߡӒ ۽Ӓ, printf٣ߡӦ ױ੼ ૑੷࠙ೠ ௏٘ ૑੷࠙ೠ ୹۱ ࣘب ੷ೞ ੗ܐ ࣚप 

Log (Con’t) ੹ਊ ۽Ӓ ӝߨ ಴ળ ഋधਸ ࢎਊ ݫఋؘ੉ఠ ੹ਊ ࠭য ࢎਊ ௏٘ਤ஖ (౵ੌݺ, ௏٘ۄੋ), ݽٕݺ, दр ੉߮౟ (WARNING, DEBUG, TRACE, FATAL) ৘ઁ “2007-04-02 20:24:13,509 [main] DEBUG TestLogging – Start of main()” 2007-04-02|02:24:13|509|main|DEBUG|TestLogging – Start of main() ۽Ӧਸ ࢶఖ оמೞѱ ݅ٚ׮ C/CPP੄ ۽Ӧ ݒ௼۽ Aspect о߸੸ੋ ࣁ޻ب ೲਊ ޙઁ੼੄ ࢿѺਸ ҳ࠙ ੌҙࢿ ੤ࢎਊೡ ࣻ ੓ח ۽Ӧਸ ࢤࢿ 

C/CPP Macro Log int _tmain(int argc, _TCHAR* argv[]) { logFunc = (LOG_OUTPUT_FUNC) printf; int size = 10; SetPrintableModule(LOG_MODULE_UI, 1); LOG_DEBUG(LOG_MODULE_UI, ("size = %d", size)); return 1; } 

Log Library ۽Ӧ੄ ױ੼ਸ ӓࠂ ಴ળ ഋधࢎਊ ੹ਊ ࠭য ૑ਗ ۽Ӓ য়ߡ೻٘ ઴੐ ࠺زӝ ۽Ӓ Windows Service, remote socket ۽Ӓ ۨ߰ ۽Ӓ ২࣌ ૑ਗ ੌҙػ ੋఠಕ੉झ ઙܨ Log4XXX NT Event Log DarkLog 

Log4XXX Apache Logging Service ׮নೠ ঱য, ജ҃ ૑ਗ CPP, JAVA, .NET, Peal, PHP, PLSQL, JDK 1.4’s util.logging.framwork ౠ૚ Logger hierarchy com.fooܳ ࢚ࣘ߉਷ com.foo.Bar log4cxx::LoggerPtr logger(log4cxx::Logger::getLogger("com.foo")); log4cxx::LoggerPtr barlogger(Logger::getLogger(("com.foo.Bar")); Log Level Appender console, file, gui component, remote socket, NT event log, syslog Asynchronous log Layout Environment File INI, XML ੹ਊ࠭য ChainSaw TraceTool 8 

Log4XXX (Con’t) 

NT Event Log 

DarkView Concept Server Server Server Server Server log aggregater (windows service) darkview log data remote
 socket i/o query 

DarkView (Con’t) 

Aspect पઁ௏٘(ز੘)ܳ ࢸݺ(aspect)ೞח ۽Ӧ (advice)ܳ पઁ ௏٘৬ ܻ࠙ೞৈ ੘ࢿೞৈ ߹ب੄ ஹ౵ੌ۞(ajc)۽ ૞ ֍য (weaving)૓׮. ۽Ӓо प೯ؼ ੢ࣗ, ਤ஖(point cut)ܳ ݺद ೡ ࣻ ੓׮. पઁ ௏٘ী ৔ೱਸ ޷஖૑ ঋਵݴ, ࢶఖ੸ਵ۽ ࢎਊоמೞ Ҋ ੤ࢎਊ੉ ए਍ ࣛܖ࣌ 

Aspect (Con’t) // Shop.java class Article { public void Buy() {// code} } // LogBuy.aj public aspect LogBuy { pointcut buyMethod() : call(public void Article.buy()); before() : buyMethod() { System.out.println(“Entering Article.buy()”);} after() : buyMethod() { System.out.println(“Leaving Article.buy()”);} } // compile $ajc LogBuy.aj Shop.java // Pseudocode class Article { public void Buy() { System.out.println((“Entering Article.buy()”); // Code(); System.out.println((“Leaving Article.buy()”); } } 

Interactive Debugging Debuggerܳ ࢎਊೞৈ पदрਵ۽ ҙ଴ ੢੼ औѱ द੘ ೡ ࣻ ੓׮. ࣗझ ࣻ੿, ஹ౵ੌ੉ ೙ਃহ੉ ߄۽ ҙ଴ оמ ਬোೠ ҙ଴ ࣻ೯઺ ࣻ੿, ੐੄੄ ؘ੉ఠ ҙ଴ оמ ૊п੸ੋ ࣁ࣌ ૊द ೐۽Ӓ۔ ࢚కܳ द೷೧ ࠁҊ ࡅܰѱ Ѿҗܳ ঳חؘ ੸೤ (gdb੄ command) Debugger੄ ઑѤ ೐۽Ӓ۔ਸ प೯ೞҊ ౠ੿ ઑѤೞী ݥ୶ѱ ೧ঠ ೠ׮. ੿૑ػ ೐۽Ӓ۔੄ ࢚కܳ ҙ଴ оמ೧ঠ ೠ׮. ੿૑ػ ೐۽Ӓ۔੄ ࢚కܳ ߸҃ ೡ ࣻ ੓যঠ ೠ׮. 

Debugger IDE ӝ߈ Debugger Visual Studio, Eclipse, Ӓ৻ ׮ࣻ ੹ޙ Debugger WinDBG, gdb, Ӓ৻ ׮ࣻ Deugger ӝמ break(breakpoint) and run, watch (watch point), modify variable value, calltrace enc (edit and continue) 

Visual Studio Debugger Visualization 

DEMO DDD Visualization 

Post-mortem Debugging Crashٸ੄ ೐۽Ӓ۔੄ ࢚కܳ ౵ੌ۽ ؒ೐ܳ Debuggerо ׮द ੍য Crash࢚కੌ ٸ੄ ೐۽Ӓ۔ ࢚కܳ ઑࢎ Dumper WinDBG UserDump Dr. Watson Error Reporting Windows Dump API Windows Visual Studio .NET Dump Debugger WinDBG Windows Visual Studio gdb 

WinDBG 

Dr. Watson 

DEMO User Dump 

Windows Error Reporting 

Windows Debug Tool ౠ੿ ࢚ടীࢲ ਬਊೞѱ ࢎਊೞח ٣ߡӦ ో GFlag Heap curruption Performance Monitoring hang(dead lock, cpu 100%) 

DEMO GFlag 

Performance Monitor 

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