Java Night Seminar : Java Troubleshooting

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̎࣌ؒूத JavaTM τϥϒϧղܾυϦϧ Ԭོ࡚೭ ιϑτ΢ΤΞɾϏδωε౷ׅຊ෦ Java ΤόϯδΣϦετ http://blogs.sun.com/okazaki

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Copyright © 2007 Sun Microsystems K.K. 14 ίϯτϩʔϧΛऔΓ໭ͦ͏! • ͕Μ͹ͬͨਓΛඇ೉ͯ͠͸͍͚ͳ͍ > ͕Μ͹ͬͨਓ͸ঢ়گΛΑ͘஌͍ͬͯΔ • ͳΔ΂͘٬؍తͳ৘ใΛऩू͢Δ > ࠞཚ͍ͯ͠Δݱ৔Ͱ͸ώΞϦϯά݁Ռʹ͸ΏΒ͕͗͋Δ > ࢥ͍ (guess) ͱࣄ࣮ (fact) Λ۠ผ͢Δ > ݕࡧՄೳͳ৔ॴʹஔ͍͓ͯ͘ ( ϝʔϧϘοΫεɺ Wiki ɾɾɾ ) • Լखͳమ๒਺ଧͪΌ͋ͨΔɾɾɾ ? > ͋ͨΔݟࠐΈ͕௿͍ͷͰɺίετߴ > ͦΕͳΒɺͦ΋ͦ΋୯ମςετͰൃݟ͞Ε͍ͯͨͷͰ͸ ?

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Copyright © 2007 Sun Microsystems K.K. 18 Ͳ͔͜ΒखΛ෇͚Δ͔Λܾ ΊΔ ( ଓ͖ ) • ͳΔ΂͘٬؍తͳදݱʹஔ͖׵͑ͯ༏ઌॱҐ෇͚ > ϏδωεɾΠϯύΫτ ( ֹۚɾӨڹϢʔβ਺ ) > ͳͥɺ XX ೔·Ͱʹղܾ͕ඞཁͳͷ͔ • աڈͷτϥϒϧʹ·ͭΘΔ΍ΓऔΓͷ܏޲ • ࠷΋͓٬༷ͱύΠϓΛ͍࣋ͬͯΔਓͷ௚ײΛ৴͡Δ • τϥϒϧղܾʹՃΘΔࣄͷͰ͖Δϝϯόʔͷྗྔ

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Copyright © 2007 Sun Microsystems K.K. 25 खݩͷ؀ڥͰ͸࠶ݱ͠ͳ͍ • ௕ظઓʹͳΔՄೳੑ͕ߴ͍ͷͰɺަবͷࡐྉΛू ΊΔ > ຊ൪؀ڥͰ͔͠ൃੜ͠ͳ͍໰୊ͷղܾ͸ࠔ೉ > σόοΨ΍πʔϧΛ༰қʹಋೖ͢Δࣄ͕Ͱ͖ͳ͍ > SOX ๏ʹΑΓɺຊ൪؀ڥʗσʔλΛ͔ͭͬͨ࠶ݱςετ͸ ΑΓࠔ೉ʹ > աڈͷྨࣅࣄྫ౳ͷ৘ใΛूΊΔ • ӡ༻ʹӨڹΛ༩͑ʹ͍͘πʔϧͷಋೖΛަব > Dtrace

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Copyright © 2007 Sun Microsystems K.K. 27 ࠜຊతͳ෦෼ʹݪҼ͕͋Δ • ௕ظԽ͢ΔՄೳੑ͕ߴ͍ͷͰɺҰ࣌తͳճආࡦΛ ࡞੒ > ަবͷࡐྉΛूΊΔ > Ұ࣌తͳճආࡦͷ࡞੒΋ݕ౼͢Δ > े෼ަবͷࡐྉΛूΊͳ͍ͱɺҰ࣌తͳճආࡦ͕ͦͷ· ·࠾༻͞Εͯܧଓతʹ࠾༻͞ΕΔࣄʹɾɾɾ • ΞʔΩςΫνϟͷઃܭͰ͸z Simple is Best” ͕ͩɺ l Simple is Hard” Ͱ͋Δ͜ͱ΋Α͘ߟྀ͓ͯ͘͠

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Copyright © 2007 Sun Microsystems K.K. 33 Java VM ʹ͓͚ΔϝϞϦྖҬ 1.4.2 5.0 6 ̘ʗωΠςΟϒ ώʔϓྖҬ Java ώʔϓྖҬ Java ίʔυ PermGen ྖҬ ωΠςΟϒϥΠϒϥϦ͕ malloc() ͨ͠ϝϞϦྖҬ εϨουͷωΠςΟϒɾελοΫྖҬ ωΠςΟϒελοΫ ωΠςΟϒελοΫ Java ελοΫ Java ελοΫ ωΠςΟϒελοΫ Java ελοΫ ωΠςΟϒελοΫྖҬαΠζ͸ -Xss Ͱࢦఆ

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Copyright © 2007 Sun Microsystems K.K. 40 jstat $ jstat -gcutil 2080 1000 S0 S1 E O P YGC YGCT FGC FGCT GCT 40.63 0.00 52.78 70.81 99.62 392 3.390 10 6.894 10.284 40.63 0.00 56.92 70.81 99.62 392 3.390 10 6.894 10.284 40.63 0.00 61.10 70.81 99.62 392 3.390 10 6.894 10.284 40.63 0.00 64.65 70.81 99.62 392 3.390 10 6.894 10.284 40.63 0.00 70.04 70.81 99.62 392 3.390 10 6.894 10.284 JRE 1.4.2 Ͱ͸ -XX:+UsePerfData ͷ෇Ճ͕ඞཁ JDK 6 ΑΓਖ਼ࣜπʔϧʹঢ֨ 1.4.2 5.0 6 Visual GC ͷίϚϯυϥΠϯ൛

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Copyright © 2007 Sun Microsystems K.K. 42 JRE 5.0 Ҏ߱ʹ͓͚Δվળ 1.4.2 5.0 6 ̘ʗωΠςΟϒ ώʔϓྖҬ Java ώʔϓྖҬ Java ίʔυ PermGen ྖҬ Java ίʔυ PermGen ྖҬ Hello, 3642 Hello, 3643 Hello, 3644 Exception in thread "main" java.lang.OutOfMemoryError: PermGen space ͲͷྖҬͰ OutOfMemoryError ͱͳ͔ͬͨ දࣔ͞ΕΔΑ͏ʹվળ

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Copyright © 2007 Sun Microsystems K.K. 43 Java SE 6 Ҏ߱ʹ͓͚Δվળ 1.4.2 5.0 6 ̘ʗωΠςΟϒ ώʔϓྖҬ Java ώʔϓྖҬ Java ίʔυ PermGen ྖҬ Java ίʔυ PermGen ྖҬ Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:2882) at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100) at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390) at java.lang.StringBuffer.append(StringBuffer.java:224) at JavaNightSeminar.main(JavaNightSeminar.java:6) ελοΫτϨʔε΋දࣔ͞ΕΔΑ͏ʹ

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Copyright © 2007 Sun Microsystems K.K. 44 -XX:+HeapDumpOnOutOfMemoryError 1.4.2 5.0 6 ̘ʗωΠςΟϒ ώʔϓྖҬ Java ώʔϓྖҬ Java ίʔυ PermGen ྖҬ Java ίʔυ PermGen ྖҬ Hello, 2667 Hello, 2668 java.lang.OutOfMemoryError: PermGen space Dumping heap to java_pid148.hprof ... Heap dump file created [3771471 bytes in 0.200 secs] Exception in thread "main" java.lang.OutOfMemoryError: PermGen space OutOfMemoryError ൃੜ࣌ʹώʔϓͷ μϯϓΛੜ੒ ( ޙड़ͷπʔϧͰղੳ ) JRE 1.4.2_12 Ҏ߱ɺ JRE 1.5.0_07 Ҏ߱ɺ JRE 1.6.0 Ҏ߱Ͱαϙʔτ

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Copyright © 2007 Sun Microsystems K.K. 45 ώʔϓμϯϓͷऔಘ(jmap) 1.4.2 5.0 6 $ jps 2080 Main 3864 jar 2348 jps $ jmap -dump:live,file=filename.dmp,format=b 2080 ࣮ߦதͷϓϩηεͷώʔϓμϯϓΛ ͋Β͔͡Ίର৅ JVM ʹΦϓγϣϯΛ Ճ࣮͑ͣߦՄೳ ( ಉҰϚγϯͷಉҰϢʔβͷΈ )

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Copyright © 2007 Sun Microsystems K.K. 55 ࣄલʹ౰ͨΓΛ෇͚͓ͯ͘ • ঱ঢ়΍աڈͷࣄྫ͔Βո͍͠෦෼Λಛఆ͓ͯ͘͠ • UML ϦόʔεΤϯδχΞϦϯάΛ࢖ͬͯ֓؍Λ೺Ѳ • ίʔυνΣοΫπʔϧΛ׆༻͢Δ > PMD (http://pmd.sourceforge.net) > Checkstyle (http://checkstyle.sourceforge.net) > FindBugs (http://findbugs.sourceforge.net)

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Copyright © 2007 Sun Microsystems K.K. 61 A2. όάΛ୳͍ͯͩ͘͠͞ public boolean equals(Object o) { if (o == null) return false; if (o instanceof Seminar) { Seminar s = (Seminar) o; return name != null && name.equals(s.name) } else return false; } null νΣοΫΛઌʹߦΘͳ͍ͱҙຯ͕ແ͍

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Copyright © 2007 Sun Microsystems K.K. 62 A2. όάΛ୳͍ͯͩ͘͠͞ public boolean equals(Object o) { if (o == null) return false; if (o instanceof Seminar) { Seminar s = (Seminar) o; return name != null && name.equals(s.name) } else return false; } Ҿ਺͸ Object Ͱͳ͚Ε͹ͳΒͳ͍

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Copyright © 2007 Sun Microsystems K.K. 64 େྔͷίʔυΛղੳ͢Δͱ ͖ • IDE ͷػೳ͸ศར͚ͩΕͲॏ͗͢Δ • ίʔυݕࡧΤϯδϯ΍ HTML ԽΛ׆༻ > େྔͷίʔυΛzϒϥ΢ζzͱ͍͏ҙຯͰ͸ Web ϒϥ΢β ͸࢖͍΍͍͢ > ઐ༻ιϑτ͸ݕࡧ΋Ͱ͖ͯߴ଎ • ίϚϯυϥΠϯͷڧΈ͸݈ࡏ > grep, find, awk, perl ͳͲͳͲ > IDE ͷػೳʹͳͯ͘΋ࣗ࡞͢Δ ( ͳΔ΂͘ίϯϐϡʔλʹ ࢓ࣄΛͤ͞Δ )

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Copyright © 2007 Sun Microsystems K.K. 65 ίʔυݕࡧ: OpenGrok • OpenGrok > http://www.opensolaris.org/os/project/opengrok > OpenSolaris ϓϩδΣΫτͰ࡞੒͞ΕͨݕࡧʗΫϩεϦϑΝ ϨϯεΤϯδϯ > Java ͚ͩͰͳ͘ɺ C/C++ ɺγΣϧεΫϦϓτͳͲʹ΋ରԠ > ಋೖ͕͔ΜͨΜ

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Copyright © 2007 Sun Microsystems K.K. 66 OpenGrok ͷಋೖ • ඞཁϑΝΠϧΛμ΢ϯϩʔυ > opengrok-0.4.tar.gz ... OpenGrok ຊମͱιʔε > http://www.opensolaris.org/os/project/opengrok > Exuberant ctags (http://ctags.sourceforge.net) > Java5.0 Ҏ্ > Tomcat͔ GlassFish > Subversion 1.3.0 (Subversion Λ࢖͏৔߹ͷΈ ) > Mercurial (Mercurial Λ࢖͏৔߹ͷΈ )

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Copyright © 2007 Sun Microsystems K.K. 70 OpenGrok ιʔεͷݕࡧ४උ(Web) ΠϯσοΫεΛ࡞੒ͨ͠σΟϨΫτϦ (DATA_ROOT)ͱ ιʔείʔυͷσΟϨΫτϦ (SRC_ROOT) Λ web.xml ʹهड़ OpenGrok A wicked fast source browser DATA_ROOT /directory/containing/data SRC_ROOT /directory/containing/src

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Copyright © 2007 Sun Microsystems K.K. 81 JMeter ͰεϧʔϓοτΛܭଌ͢Δ • ෛՙੜ੒ˍϨεϙϯεϩάऔಘ > ϩάΛՃ޻ͯ͠σʔλΛ෼ੳ 0 1000 2000 3000 4000 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 ϘτϧωοΫ͕ݱΕ࢝Ίͨέʔε ฒྻ౓ ( ୯Ґ࣌ؒ 1 ඵ ) 0 25 50 75 100 125 150 175 0 20 40 60 80 100 120 140 160 180 ΄ͱΜͲϘτϧωοΫ͕ͳ͍έʔε ฒྻ౓ ( ୯Ґ࣌ؒ 1 ඵ ) εϧʔϓοτ (1 ඵؒ͋ͨΓͷॲཧ׬ྃ਺ )

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Copyright © 2007 Sun Microsystems K.K. 82 JMeter ͰεϧʔϓοτΛܭଌ͢Δ • ৄ͘͠͸ ... > http://blogs.sun.com/okazaki/entry/sdc_performance_tuning_seminar > http://blogs.sun.com/okazaki/entry/throughput_analysis_2 > http://blogs.sun.com/okazaki/entry/throughput_analysis_3

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Copyright © 2007 Sun Microsystems K.K. 84 DTrace࢖༻ྫ #!/usr/sbin/dtrace -s dvm$1:::monitor-wait { self->my[tid, copyinstr(arg0)] = timestamp; } dvm$1:::monitor-waited { @my[tid, copyinstr(arg0)] = sum(timestamp – self->my[tid, copyinstr(arg0)]); } pid$1::exit:entry { printa(@my); exit(0); } • ΞϓϦέʔγϣϯαʔόͷ JDBC ίωΫγϣϯϓʔϧ ͷେ͖͞ͱ଴ͪ࣌ؒ

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Copyright © 2007 Sun Microsystems K.K. 85 8 16 32 64 128 0 2000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 0 20 40 60 80 100 Size of conn. pool Latency (µs) Occupation time (ms) DTraceͰ AppServer ΛϓϩϑΝΠϧ • ࣗ෼ͷཉ͍͠৘ใΛ๬Έ௨ΓʹऔಘՄೳ • γεςϜύϑΥʔϚϯεʹେ͖ͳӨڹΛ༩͑ͳ͍ > DTrace ࣗ਎͕աෛՙͳϓϩϑΝΠϧΛࣗಈఀࢭ

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Copyright © 2007 Sun Microsystems K.K. 92 ࣄલͷ४උ: Ԭ࡚ͷ৔߹ • ϒϩάΛಡΉ > RSS ͨ͘͞Μ (30 αΠτఔ౓ ) > 100~200 ΤϯτϦ / ೔ > ͳΔ΂ࣗ͘෼΋ϒϩάʹ࢒͢ • ϝʔϧΛಡΉ > ϝʔϦϯάϦετͨ͘͞Μ (100 ఔ౓ ) > 200~300 ௨ / ೔ > ͳΔ΂͘ࢀՃ͢Δ த਎·Ͱ͔ͬ͠ΓಡΉ ͷ͸ 2 ׂఔ౓ ࠷େ 500 ΤϯτϦ / ೔ ͕ݶ౓

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Copyright © 2007 Sun Microsystems K.K. 99 ࢀߟࢿྉ • ϒϩά > http://blogs.sun.com/okazaki • πʔϧؔ܎ > http://ja.netbeans.org > http://pmd.sourceforge.net > http://checkstyle.sourceforge.net > http://findbugs.sourceforge.net > http://www.opensolaris.org/os/project/opengrok • ͦͷଞ > http://sdc.sun.co.jp

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Takayuki Okazaki [email protected] http://blogs.sun.com/okazaki ̎࣌ؒूத JavaTM τϥϒϧղܾυϦϧ