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![•$ jcmd 1234 Compiler.codelist1234:53 4 java.lang.String.hashCode()I [0x00007fd2cd776090, 0x00007fd2cd776200 - 0x00007fd2cd776398]コンパイルIDコンパイルレベル（Tiered Compilation）メソッド名nmethod開始アドレスコード開始アドレスコード終了アドレス](/image.pl?url=https%3a%2f%2fimage.slidesharecdn.com%2fjdk9-160524140253%2f85%2fJava-9-31-320.jpg&f=jpg&w=240)
![•"Attach Listener" #12 daemon prio=9 os_prio=0 tid=0x00007f3224001000 nid=0xb8f7 waiting on condition [0x0000000000000000]java.lang.Thread.State: RUNNABLE](/image.pl?url=https%3a%2f%2fimage.slidesharecdn.com%2fjdk9-160524140253%2f85%2fJava-9-44-320.jpg&f=jpg&w=240)
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More from Yasumasa Suenaga
Java 9で進化する診断ツール
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- 7.•••• http://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/tooldescr016.html#BABFCHDEIt issuggested to use the latest utility, jcmd instead of theprevious jstack utility for enhanced diagnostics and reducedperformance overhead.
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- 10.コマンド 内容VM.log ログ出力設定とローテーションの実行VM.print_touched_methods実行されたメソッドの一覧表示VM.classloader_stats クラスローダに関する情報の表示VM.stringtable StringTable（String#intern()した文字列や解決したクラス名が入っているテーブル）の概要表示、ダンプVM.symboltable SymbolTable（メソッド名等）の概要表示、ダンプVM.class_hierarchy Javaヒープ中のクラス階層構造の表示VM.info javaプロセスの詳細情報、およびマシン情報の表示VM.dynlibs ロードされている共有ライブラリの出力VM.set_flag フラグ（-XXオプション）の変更VMドメイン
- 11.コマンド 内容Compiler.directives_clear JITコンパイラへの指示をすべてクリアCompiler.directives_remove一番最後のJITコンパイラへの指示を削除Compiler.directives_add JITコンパイラへの指示をJSON形式での指定Compiler.directives_print JITコンパイラへの現在の指示内容の表示Compiler.codecache コードキャッシュの概要の表示Compiler.codelist コードキャッシュの内容表示Compiler.queue JITコンパイラのコンパイル待ちキューにあるメソッドの表示Compilerドメイン
- 12.コマンド 内容ManagementAgent.status JMXエージェントの状態表示JVMTI.agent_loadJVMTIエージェントのロードJVMTI.data_dump JVMTIのデータダンプ要求（DataDumpRequest）発行GC.finalizer_info ファイナライザ実行待ちキューに入っているクラス情報の表示GC.heap_info Javaヒープの概要表示その他
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- 16.$ jcmd 1234VM.log output="file=gc.log" output_options="filecount=5,filesize=10m" what="gc=debug" decorators="time,level"オプション名 内容output 出力先”#<数字>”を指定すると既存のoutputに対する変更を意味するoutput_options 出力オプションwhat タグやログレベルの設定decorators ログデコレーションの設定
- 17.•1.2.••$ jcmd 1234VM.log rotate
- 18.$ jcmd 1234VM.log list1234:Available log levels: off, trace, debug, info, warning, errorAvailable log decorators: time (t), uptime (u), timemillis (tm), uptimemillis (um), timenanos (tn), uptimenanos(un), hostname (hn), pid (p), tid (ti), level (l), tags (tg)Available log tags: add, age, alloc, arguments, annotation, barrier, biasedlocking, bot, breakpoint, census,class, classhisto, cleanup, compaction, constraints, constantpool, coops, cpu, cset, data, defaultmethods, dump,ergo, exceptions, exit, freelist, gc, heap, humongous, ihop, iklass, init, itables, jni, jvmti, liveness, load,loader, logging, mark, marking, methodcomparator, metadata, metaspace, mmu, modules, monitorinflation,monitormismatch, nmethod, normalize, objecttagging, obsolete, oopmap, os, pagesize, path, phases, plab, promotion,preorder, protectiondomain, ref, redefine, refine, region, remset, purge, resolve, safepoint, scavenge, scrub,stacktrace, start, startuptime, state, stats, stringdedup, stringtable, stackmap, subclass, survivor, sweep, task,thread, tlab, time, timer, update, unload, verification, verify, vmoperation, vtables, workgangDescribed tag combinations:logging: Logging for the log framework itselfLog output configuration:#0: stdout all=warning uptime,level,tags#1: stderr all=off uptime,level,tags#2: gc.log gc=debug filecount=5,filesize=20M level,tagsJDK-8153074UL: Show output option in VM.log jcmd
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- 21.$ jcmd 1234VM.info1234:## JRE version: Java(TM) SE Runtime Environment (9.0+119) (build 9-ea+119)# Java VM: Java HotSpot(TM) 64-Bit Server VM (9-ea+119, mixed mode, tiered, compressed oops, g1 gc, linux-amd64)--------------- S U M M A R Y ------------Command Line: LongSleepHost: Intel(R) Core(TM) i3-2367M CPU @ 1.40GHz, 2 cores, 1G, Fedora release 23 (Twenty Three)Time: Mon May 23 20:32:22 2016 JST elapsed time: 16 seconds (0d 0h 0m 16s)--------------- P R O C E S S ---------------Heap address: 0x00000000e0e00000, size: 498 MB, Compressed Oops mode: 32-bitNarrow klass base: 0x0000000000000000, Narrow klass shift: 3Compressed class space size: 1073741824 Address: 0x0000000100000000：
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- 23.••$ jcmd 1234VM.flags -all | grep -E 'manageable|product_rw'intx CMSAbortablePrecleanWaitMillis = 100 {manageable}intx CMSTriggerInterval = -1 {manageable}intx CMSWaitDuration = 2000 {manageable}bool HeapDumpAfterFullGC = false {manageable}bool HeapDumpBeforeFullGC = false {manageable}bool HeapDumpOnOutOfMemoryError = false {manageable}ccstr HeapDumpPath = {manageable}uintx MaxHeapFreeRatio = 70 {manageable}uintx MinHeapFreeRatio = 40 {manageable}bool PrintClassHistogram = false {manageable}bool PrintConcurrentLocks = false {manageable}
- 24.•$ jcmd 1234VM.set_flag HeapDumpOnOutOfMemoryError true1234:Command executed successfully$ jcmd 1234 VM.flags1234:-XX:CICompilerCount=2 -XX:ConcGCThreads=1 -XX:G1HeapRegionSize=1048576-XX:+HeapDumpOnOutOfMemoryError -XX:InitialHeapSize=33554432 -XX:MarkStackSize=4194304-XX:MaxHeapSize=522190848 -XX:MaxNewSize=312475648 -XX:MinHeapDeltaBytes=1048576-XX:NonNMethodCodeHeapSize=5824844 -XX:NonProfiledCodeHeapSize=122916698-XX:ProfiledCodeHeapSize=122916698 -XX:ReservedCodeCacheSize=251658240-XX:+SegmentedCodeCache -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseG1GCJDK-8155936Boolean value should be set 1/0 or true/false viaVM.set_flag jcmd
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- 28.$ jcmd 1234Compiler.directives_add compiler-directive.json1234:1 compiler directives added
- 29.•$ jcmd 1234Compiler.directives_print1234:Directive:matching: *String.hashCodec1 directives:inline: -Enable:false Exclude:false BreakAtExecute:false BreakAtCompile:false Log:false PrintAssembly:false PrintInlining:false PrintNMethods:falseBackgroundCompilation:true ReplayInline:false DumpReplay:false DumpInline:false CompilerDirectivesIgnoreCompileCommands:false DisableIntrinsic:BlockLayoutByFrequency:true PrintOptoAssembly:false PrintIntrinsics:false TraceOptoPipelining:false TraceOptoOutput:false TraceSpilling:falseVectorize:false VectorizeDebug:false CloneMapDebug:false DoReserveCopyInSuperWordDebug:false IGVPrintLevel:0 MaxNodeLimit:80000c2 directives:inline: -Enable:true Exclude:true BreakAtExecute:false BreakAtCompile:false Log:false PrintAssembly:false PrintInlining:false PrintNMethods:falseBackgroundCompilation:true ReplayInline:false DumpReplay:false DumpInline:false CompilerDirectivesIgnoreCompileCommands:false DisableIntrinsic:BlockLayoutByFrequency:true PrintOptoAssembly:false PrintIntrinsics:false TraceOptoPipelining:false TraceOptoOutput:false TraceSpilling:falseVectorize:false VectorizeDebug:false CloneMapDebug:false DoReserveCopyInSuperWordDebug:false IGVPrintLevel:0 MaxNodeLimit:80000Enable ：ディレクティブの明示的設定Exclude ：JIT除外設定
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- 31.•$ jcmd 1234Compiler.codelist1234:53 4 java.lang.String.hashCode()I [0x00007fd2cd776090, 0x00007fd2cd776200 - 0x00007fd2cd776398]コンパイルIDコンパイルレベル（Tiered Compilation）メソッド名nmethod開始アドレスコード開始アドレスコード終了アドレス
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- 40.•••••$ jcmd 1234GC.heap_info1234:garbage-first heap total 32768K, used 1024K [0x00000000e0e00000, 0x00000000e0f00100, 0x0000000100000000)region size 1024K, 2 young (2048K), 0 survivors (0K)Metaspace used 3332K, capacity 4486K, committed 4864K, reserved 1056768Kclass space used 328K, capacity 386K, committed 512K, reserved 1048576K
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- 44.•"Attach Listener" #12daemon prio=9 os_prio=0 tid=0x00007f3224001000 nid=0xb8f7 waiting on condition [0x0000000000000000]java.lang.Thread.State: RUNNABLE
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- 49.• S A••Java 9からは各種ツールでSAが使えなくなりました！•• OpenJDKのdebuginfoパッケージ必須•••
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- 51.ツール名 概要clhsdb コマンドライン版HotSpotデバッガhsdbGUI版HotSpotデバッガjstack SA版jstackjmap SA版jmapjinfo SA版jinfojsnap hsperfdataの読み取り
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- 54.••••••JDK-8151815Could not parsecore image with JSnap.
- 55.•(gdb) x/g ((G1CollectedHeap*)Universe::_collectedHeap)->_g1mm->_full_collection_counters->_time ->_valuep0x7f8c6884b960: 15535194例：Full GCの累計実行時間を出してみる（jstatのFGCT相当）15535194÷1000000000≒0.015 (sec)
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- 57.•$ $JAVA_HOME/bin/jhsdb jsnap--exe $JAVA_HOME/bin/java --core core.6937 --all | grep -a -e sun.gc.collector.1.time -e sun.os.hrt.frequencysun.gc.collector.1.time=15535194 tick(s)sun.os.hrt.frequency=1000000000 Hz15535194÷1000000000≒0.015 (sec)この実現のためにJDK-8151815ガンバってます！
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- 68.Project Kenaiのもの Fedora23でビルドしたものStubRoutines::updateBytesCRC32※OracleJDK8u92 Linux x64で確認（-XX:+UnlockDiagnosticVMOptions -XX:+PrintStubCode）
- 69.Fedora23 x64の場合$ dnfdownload --source binutils$ rpm -ivh <binutils>$ cd ~/rpmbuild/SPECS$ rpmbuild -bp binutils.spec$ cd <OpenJDK src>/hotspot/src/share/tools/hsdis$ make BINUTILS=~/rpmbuild/BUILD/<binutils> ARCH=amd64$ ls build/linux-amd64/hsdis-amd64.sobuild/linux-amd64/hsdis-amd64.sobinutilsのSRPM取得SRPM展開hsdisのビルドhsdis本体
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