ããã¯ããªã«ããããã¦æ¸ãããã®ï¼
JDK Flight Recorderï¼JFRï¼ã¨JDK Mission Controlï¼JMCï¼ã«ã¤ãã¦è¦ã¦ã¿ããã¨æãã¤ã¤ããã£ã¨ãã®ã¾ã¾ã«ãã¦ããã®ã§ãããã
ã¡ããã¨è¦ã¦ãããããªã¨ãããã¨ã§ã
ãªããä»åã¯ãã£ããã³ãã³ãã®ä½¿ãæ¹ã®é°å²æ°ã ããè¦ããã¨ã«ãã¦ããã¾ãã
JEP 328ï¼Flight Recorderï¼JFRï¼
JEP 328ï¼Flight RecorderãJDK Flight Recorderï¼JFRï¼ã®ãã¼ã¸ã¯ãã¡ãã
JFRã¯Javaã¢ããªã±ã¼ã·ã§ã³ã¨HotSpot JVMã®ãã©ãã«ã·ã¥ã¼ãã®ããã®ããªã¼ããããã®å°ãªããã¼ã¿åéãã¬ã¼ã ã¯ã¼ã¯ã§ãã
è¦ããã«ãã©ãã«ã·ã¥ã¼ãã£ã³ã°ãã¢ãã¿ãªã³ã°ããããã¡ã¤ãªã³ã°ãè¡ãä»çµã¿ã§ããOpenJDK 11ã§å°å
¥ããã¦ãã¾ãã
OpenJDK 8ã«ã¯u262ã§ããã¯ãã¼ããããã¿ããã§ãã
ãã£ã¨ããå®éã«å¤ãã®ãã£ã¹ããªãã¥ã¼ã·ã§ã³ã§ä½¿ããã®ã¯u272以éã®ããã§ããã
ã¢ã¸ã¥ã¼ã«ããããAPIã使ã£ã¦èªåã§ã¤ãã³ãããã¼ã¿ã®è¨é²ãã§ããããã§ãã
ä»åã¯ãjavaã³ãã³ããjcmdã«ããJFRã使ã£ããã¼ã¿ã®è¨é²ã«ãã©ã¼ã«ã¹ãããã¨æãã¾ãã
javaã³ãã³ãã«-XX:StartFlightRecording
ãªãã·ã§ã³ã使ããã¨ã§ãJFRã®è¨é²ãéå§ãã¾ãã
-XX:StartFlightRecording=parameter=value
æå®ã§ãããã©ã¡ã¼ã¿ã¼ã¯ãã¡ãã§ãããªãã·ã§ã³ãè¤æ°æå®ããå ´åã¯ãã,ãåºåãã§æå®ãã¾ãã
- delay ⦠Javaã¢ããªã±ã¼ã·ã§ã³ã®èµ·åããè¨é²ãéå§ããã¾ã§ã®æéãç§ï¼sï¼ãåï¼mï¼ãæéï¼hï¼ãæ¥ï¼dï¼åä½ã§æå®å¯è½ãããã©ã«ãã¯0
- disk ⦠è¨é²ä¸ã«ãã£ã¹ã¯ãæ¸ãè¾¼ããã©ãããtrueï¼falseã§æå®ãããã©ã«ãã¯true
- dumponexit ⦠Java VMãåæ¢ããæã«å®è¡ä¸ã®è¨é²ããã³ããããã©ãããtrueï¼falseã§æå®ãããtrueãæå®ãã¦filenameãå ¥åãã¦ããªãå ´åã¯ãã¬ã³ã¼ãã£ã³ã°ãããã»ã¹ãèµ·åãããã£ã¬ã¯ããªã«ä¿åããã¡ã¤ã«åã¯èªåã§æ±ºå®ãããããã©ã«ãã¯false
- duration ⦠è¨é²ã®ç¶ç¶æéãç§ï¼sï¼ãåï¼mï¼ãæéï¼hï¼ãæ¥ï¼dï¼åä½ã§æå®ãããããã©ã«ãã¯0ã§æéã¯å¶éãããªã
- filename ⦠è¨é²ãåæ¢ããæã«ãçµæãæ¸ãè¾¼ããã¡ã¤ã«ãã¹ãæå®ã
%p
ã§Java VMã®PIDã%t
ã§ç¾å¨ã®ã¿ã¤ã ã¹ã¿ã³ããæå³ããæ¸å¼æååã使ç¨å¯è½ - name ⦠è¨é²ã®ååã¨èå¥åãæå®
- maxage ⦠è¨é²ãä¿æãããã£ã¹ã¯ãã¼ã¿ã®æ大ä¿ææéãæå®ãããdisk=trueã®å ´åã®ã¿æå¹ãç§ï¼sï¼ãåï¼mï¼ãæéï¼hï¼ãæ¥ï¼dï¼åä½ã§æå®ãããããã©ã«ãã¯0ã§æ大ä¿ææéã¯å¶éãããªã
- maxsize ⦠è¨é²ãä¿æãããã£ã¹ã¯ãã¼ã¿ã®æ大ãµã¤ãºï¼ãã¤ãåä½ï¼ãæå®ãããdisk=trueã®å ´åã®ã¿æå¹ã-XX:FlightRecorderOptionsã®maxchunksizeã®æå®å¤ããå°ããã§ããªããmï¼Mã§MBåä½ãgï¼Gã§GBåä½ã§æå®ãããããã©ã«ãã¯0ã§æ大ãµã¤ãºã¯å¶éãããªãã
- path-to-gc-roots ⦠è¨é²ã®çµäºæã«GCã®ã«ã¼ãã¸ã®ãã¹ãåéãããã©ãããtrueï¼falseã§æå®ãããã©ã«ãã¯false
- settings ⦠ã¤ãã³ãè¨å®ãã¡ã¤ã«ã®ãã¹ã¨ååãæå®ãããããã©ã«ãã¯
${JAVA_HOME}/lib/jfr/default.jfc
ã¾ã-XX:FlightRecorderOptions
ã§JFRã®åä½ãå¶å¾¡ãããã©ã¡ã¼ã¿ã¼ãè¨å®ã§ãã¾ãããã¡ãã¯ãã©ã¡ã¼ã¿ã¼åã®ã¿è¼ãã¦ããã¾ãã
- globalbuffersize
- maxchunksize
- memorysize
- numglobalbuffers
- old-object-queue-size
- preserve-repository
- repository
- retransform
- stackdepth
- threadbuffersize
ã¾ãjcmdã§ãJFRã®æä½ãè¨å®ãã§ãã¾ãã
- JFR.start ⦠JFRã®è¨é²ã®éå§ã
-XX:StartFlightRecording
ã¨åçã§ããªãã·ã§ã³ãåã - JFR.stop ⦠JFRã®è¨é²ã®åæ¢
- JFR.configure ⦠JFRã®è¨å®ãè¡ãã
-XX:FlightRecorderOptions
ã§è¨å®ã§ãããªãã·ã§ã³ã»ã¼åç - JFR.dump ⦠JFRã®è¨é²ããã³ããã
- JFR.check ⦠å®è¡ä¸ã®JFRã®è¨é²ã®æ å ±ã表示ãã
å®éã«ä½¿ãæã¯java
-XX:StartFlightRecordingãã
jcmd [PID] JFR.startã
jcmd [PID] JFR.stopã
jcmd [PID] JFR.dump`ãããã«ãªãã§ãããã
çµæã確èªããããªããã£ããªæä½ã¨ãã¦ã¯jfrã³ãã³ãã¨ãããã®ã使ããããã§ãããå®éã«ã¯å¾è¿°ã®JDK Mission Controlã使ããã¨ã«
ãªãã§ãããã
JDK Mission Controlï¼JMCï¼
JDK Mission Controlï¼JMCï¼ã¯ãJava VMã«å¯¾ãã¦JFRã«ããè¨é²ãè¡ã£ãããJFRã§è¨é²ãããã¡ã¤ã«ãåæã§ããããããã¼ã«ã§ãã
JMCã®GitHubãªãã¸ããªã¼ã¯ãã¡ãã
JMCã¯OpenJDKã«ã¯å梱ããã¦ããããå¥éãã¦ã³ãã¼ãããå¿ è¦ãããã¾ãã
JMCã®GitHubãªãã¸ããªã¼ã«è¨è¼ãããã¾ããã以ä¸ã主è¦ãªãã¦ã³ãã¼ãå ã§ããã
Eclipse Mission Controlã
Eclipse Mission Control | Adoptium
Azul Mission Controlã
Azul Mission Control - Azul | Better Java Performance, Superior Java Support
Liberica Mission Controlã
JMC for Correttoï¼OpenJDK 8ã11ã¾ã§ï¼ã
GitHub - corretto/corretto-jmc: A build of JDK Mission Control (JMC) by the Corretto team.
ããã¦OracleãRed HatãããJMCãæä¾ããã¦ãã¾ãï¼æåï¼ã
JDK Flight Recorderã¨JDK Mission Controlã«ã¤ãã¦ã¯ããã®ããããåèã«ããã¨ããããããã¾ããã
Zulu Flight Recorder と Mission Control を使用してデータを確認する | Microsoft Learn
Red Hat build of OpenJDK での JDK Flight Recorder の使用 | Red Hat Product Documentation
Using Java Flight Recorder - Quarkus
ä»åã¯ç°¡åãªã¢ããªã±ã¼ã·ã§ã³ãä½æããJFRã§è¨é²ãJMCï¼Eclipse Mission Controlï¼ã§ç¢ºèªãã¦ã¿ããã¨æãã¾ãã
åæã®ãã¼ãã¯ãã¼ãã ã£ããã¨ããã¤ãããã¨æãã¾ãããä»åã¯å¦çã«æéã®ãããã¡ã½ãããå®è¡ãã¦ã©ã®ãããªçµæãå¾ãããã®ãã
è¦ã¦ããããã¨æãã¾ãã
ç°å¢
ä»åã®ç°å¢ã¯ãã¡ãã
$ java --version openjdk 21.0.5 2024-10-15 OpenJDK Runtime Environment (build 21.0.5+11-Ubuntu-1ubuntu124.04) OpenJDK 64-Bit Server VM (build 21.0.5+11-Ubuntu-1ubuntu124.04, mixed mode, sharing) $ mvn --version Apache Maven 3.9.9 (8e8579a9e76f7d015ee5ec7bfcdc97d260186937) Maven home: $HOME/.sdkman/candidates/maven/current Java version: 21.0.5, vendor: Ubuntu, runtime: /usr/lib/jvm/java-21-openjdk-amd64 Default locale: ja_JP, platform encoding: UTF-8 OS name: "linux", version: "6.8.0-49-generic", arch: "amd64", family: "unix"
ãµã³ãã«ã¢ããªã±ã¼ã·ã§ã³ã®ä½æ
確èªå¯¾è±¡ã®ã¢ããªã±ã¼ã·ã§ã³ããªãã¨å§ã¾ããªãã®ã§ãç°¡åãªãã®ãä½æãã¾ããä»åã¯Jakarta RESTful Web Servicesï¼JAX-RSï¼ã®
SeBootstrapã使ããã¨ã«ãã¾ãããå®è£
ã¯RESTEasyã§ãã
<properties> <maven.compiler.release>21</maven.compiler.release> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> </properties> <dependencies> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-core</artifactId> <version>6.2.11.Final</version> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-undertow-cdi</artifactId> <version>6.2.11.Final</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <version>3.8.1</version> <executions> <execution> <id>copy-dependencies</id> <phase>prepare-package</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <outputDirectory>${project.build.directory}/libs</outputDirectory> </configuration> </execution> </executions> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <version>3.4.2</version> <configuration> <archive> <manifest> <addClasspath>true</addClasspath> <classpathPrefix>libs/</classpathPrefix> <mainClass>org.littlewings.jfr.Server</mainClass> </manifest> </archive> </configuration> </plugin> <plugin> <groupId>org.jboss.jandex</groupId> <artifactId>jandex-maven-plugin</artifactId> <version>1.2.3</version> <executions> <execution> <id>make-index</id> <goals> <goal>jandex</goal> </goals> </execution> </executions> </plugin> </plugins> </build>
Maven Dependency Pluginã¨Maven Jar Pluginã使ã£ã¦ãjava -jar
ã§èµ·åã§ããããã«ãã¦ããã¾ãã
Jandex Maven Pluginã¯JAX-RSã®ãªã½ã¼ã¹ã¯ã©ã¹ã®ã¹ãã£ã³ç¨ã§ãããã¨ããã§ãRESTEasyã®SeBootstrapã§ä½¿ãJandexã¯SmallRyeã®
groupIdã®ãã®ã§ã¯ãã¡ãªããã§ãããã
JAX-RSã®æå¹åã
src/main/java/org/littlewings/jfr/RestApplication.java
package org.littlewings.jfr; import jakarta.ws.rs.ApplicationPath; import jakarta.ws.rs.core.Application; @ApplicationPath("/") public class RestApplication extends Application { }
JAX-RSãªã½ã¼ã¹ã¯ã©ã¹ã10ç§ã¹ãªã¼ãããã¨ã³ããã¤ã³ãã¨ããã£ããããæ°ãè¨ç®ãã¦CPUãæ¶è²»ããã¨ã³ããã¤ã³ããä½æãã¾ããã
ãã£ããããæ°ãæå
ã®ç°å¢ã§ã¯ãã®æ°åã§ç´10ç§ãããã¾ãã
src/main/java/org/littlewings/jfr/JfrTestResource.java
package org.littlewings.jfr; import java.util.concurrent.TimeUnit; import jakarta.ws.rs.GET; import jakarta.ws.rs.Path; import jakarta.ws.rs.Produces; import jakarta.ws.rs.core.MediaType; @Path("/jfr-test") public class JfrTestResource { @GET @Path("/sleep") @Produces(MediaType.TEXT_PLAIN) public String sleep() throws InterruptedException { long sleepTime = 10L; TimeUnit.SECONDS.sleep(sleepTime); return String.format("sleep[%d] sec", sleepTime); } @GET @Path("/heavy") @Produces(MediaType.TEXT_PLAIN) public String heavy() { int n = 46; long result = fib(n); return String.format("fib[%d]: %d, done", n, result); } private int fib(int n) { if (n <= 1) { return n; } return fib(n - 1) + fib(n - 2); } }
mainã¡ã½ãããæã£ãã¯ã©ã¹ããµã¼ãã¼ãèµ·åå¾ãEnterãæã¤ã¨çµäºãã¾ãã
src/main/java/org/littlewings/jfr/Server.java
package org.littlewings.jfr; import java.util.concurrent.ExecutionException; import jakarta.ws.rs.SeBootstrap; import org.jboss.logging.Logger; public class Server { public static void main(String... args) throws ExecutionException, InterruptedException { Logger logger = Logger.getLogger(Server.class); SeBootstrap.Configuration configuration = SeBootstrap .Configuration .builder() .host("0.0.0.0") .port(8080) .build(); SeBootstrap.Instance instance = SeBootstrap .start(new RestApplication(), configuration) .toCompletableFuture() .get(); logger.info("server startup."); System.console().readLine("> Enter stop."); instance .stop() .toCompletableFuture() .get(); } }
åä½ç¢ºèªãã¾ããããããã±ã¼ã¸ã³ã°ãã¦èµ·åã
$ mvn package $ java -jar target/jdk-flight-recorder-example-0.0.1-SNAPSHOT.jar
ã¢ã¯ã»ã¹ãã¦ç¢ºèªã
$ time curl localhost:8080/jfr-test/sleep sleep[10] sec real 0m10.141s user 0m0.007s sys 0m0.005s $ time curl localhost:8080/jfr-test/heavy fib[46]: 1836311903, done real 0m9.746s user 0m0.003s sys 0m0.007s
æºåãã§ãã¾ããã
JDK Flight Recorderã使ã£ã¦è¨é²ãè¡ããJDK Mission Controlã使ã£ã¦çµæãè¦ã
ããããå ã¯ãJDK Flight Recorderã使ã£ã¦è¨é²ããã¦ã¿ãããJDK Mission Controlã使ã£ã¦çµæãè¦ã¦ããããã¨æãã¾ãã
JDK Mission Controlï¼Eclipse Mission Controlï¼ããã¦ã³ãã¼ããã
ä»åã¯JDK Mission Controlã¨ãã¦Eclipse Mission Controlã使ã£ã¦ããã¾ãã
ãã¦ã³ãã¼ãã
$ curl -LO https://github.com/adoptium/jmc-build/releases/download/9.0.0/org.openjdk.jmc-9.0.0-linux.gtk.x86_64.tar.gz $ tar xf org.openjdk.jmc-9.0.0-linux.gtk.x86_64.tar.gz
ä»å使ããã¼ã¸ã§ã³ã¯9.0.0ã§ãã
Eclipse Mission Control | Adoptium
èµ·åã
$ JDK\ Mission\ Control/jmc &
ã¹ãã©ãã·ã¥ã表示ããã¦
ããããç»é¢ã¸ããã¡ããéããã¨JDK Mission Controlã使ãå§ãããã¾ãã
ããããããã¤ãã®æ¹æ³ã§JDK Flight Recorderã§è¨é²ãåå¾ããJDK Mission Controlã§ç¢ºèªãã¦ããããã¨æãã¾ãã
javaã³ãã³ãå®è¡æã«è¨é²ãã
ã¾ãã¯javaã³ãã³ãå®è¡æã«è¨é²ãã¾ãã
dumponexit=true
ãã¤ãã¦ãçµäºæã«ãã³ãããããã«ãã¦ã¿ã¾ãããããã¡ã¤ã«åã¯èªåã«ãã¾ãã
$ java -XX:StartFlightRecording=dumponexit=true -jar target/jdk-flight-recorder-example-0.0.1-SNAPSHOT.jar
ã¢ããªã±ã¼ã·ã§ã³ãèµ·åããã¨ããããªè¡¨ç¤ºãåºã¾ããã©ããä»åã®ç°å¢ã§ã¯ããã©ã«ãã®æ大ãµã¤ãºã¯250MBã«ãªã£ã¦ããããã§ããã
[0.540s][info][jfr,startup] Started recording 1. No limit specified, using maxsize=250MB as default. [0.540s][info][jfr,startup] [0.540s][info][jfr,startup] Use jcmd 23504 JFR.dump name=1 filename=FILEPATH to copy recording data to file.
ã¢ããªã±ã¼ã·ã§ã³ã«ã¢ã¯ã»ã¹ãã¾ãã
$ curl localhost:8080/jfr-test/sleep sleep[10] sec $ curl localhost:8080/jfr-test/heavy fib[46]: 1836311903 , done
ã¢ã¯ã»ã¹ãå®äºããããã¢ããªã±ã¼ã·ã§ã³ãçµäºããã¾ãã
ããã¨ãã¢ããªã±ã¼ã·ã§ã³ã®å®è¡ãã£ã¬ã¯ããªã«ãããªãã¡ã¤ã«ãè¨é²ããã¦ãã¾ããã
$ ll -h hotspot-pid-23504-id-1-2024_12_15_16_00_34.jfr -rw-rw-r-- 1 xxxxx xxxxx 799K 12æ 15 16:00 hotspot-pid-23504-id-1-2024_12_15_16_00_34.jfr
ãã¡ããJDK Mission Controlã§éãã¾ãã
ãã¡ã½ããã»ãããã¡ã¤ãªã³ã°ããéãã¨ããã§ã«ãã£ããããæ°ã®è¨ç®ã§CPUã使ã£ã¦ãããã¨ãææããã¦ãã¾ãã
ãJavaã¢ããªã±ã¼ã·ã§ã³ãã®è¡¨ç¤ºãCPU使ç¨çã®æ¬ã§ãéãé¨åãç¹å¾´çãªãã¨ããããã¾ãã
ã¾ãã¡ã½ããã»ãããã¡ã¤ãªã³ã°ã»ãµã³ãã«ã®æ°ãä¸ä½ã®ã¹ã¬ãããè¦ã¦ã¿ãã¨ãããããããããçµæãåºã¦ãã¾ãã
ãã®é¨åãé¸æããã¨ãã¹ãªã¼ããã¦ãããã¨ããããã¾ãã
ã¾ããã®é¨åãé¸æããã¨ããã£ããããæ°ã®è¨ç®ãæéã使ã£ã¦ãããã¨ããããã¾ãã
ã¹ã¬ããã§è¦ã¦ãã¤ãã³ããè¦ã¤ããããæãããã¾ããã
ããããã§ãã
javaã³ãã³ãã§ãªãã·ã§ã³ãæå®ãããä»ã®ä¾ãè¼ãã¦ããã¾ãããã
filename=start-recording.jfr
ã§ãã¡ã¤ã«åããstart-recording.jfrãã«ãduration=3m
ã§è¨é²æéã3åéã«ããä¾ã
$ java -XX:StartFlightRecording=filename=start-recording.jfr,duration=3m,dumponexit=true -jar target/jdk-flight-recorder-example-0.0.1-SNAPSHOT.jar
ãã¡ã¤ã«ã¯èµ·åæã«ä½æããã¾ããã0ãã¤ãã§ãã
ä»åã®è¨å®ã§ã¯ã3åéçµéãããJavaã¢ããªã±ã¼ã·ã§ã³ãçµäºããã¨è¨é²ããã³ãããã¾ãã
確èªçµæã¯çç¥ãã¾ãã
jcmdã§JDK Flight Recorderã®æä½ããã
ç¶ãã¦ã¯ãjcmdã§JDK Flight Recorderã®æä½ããã¾ãããã
ã¢ããªã±ã¼ã·ã§ã³ã¯-XX:StartFlightRecording
ãã¤ããã«èµ·åãã¦ããã¾ãã
$ java -jar target/jdk-flight-recorder-example-0.0.1-SNAPSHOT.jar
ãã®Javaããã»ã¹ã®PIDãå¿ è¦ã«ãªãã®ã§ãjcmdèªä½ã§ç¢ºèªãã¾ãããã
$ jcmd
è¨é²ãéå§ãã¾ãããªãã·ã§ã³ã¯ããã©ã«ãã§ãã
$ jcmd [PID] JFR.start
å®è¡ããã¨ããããªè¡¨ç¤ºãåºã¾ãã
[PID]: Started recording 1. No limit specified, using maxsize=250MB as default. Use jcmd 24986 JFR.dump name=1 filename=FILEPATH to copy recording data to file.
ã¢ããªã±ã¼ã·ã§ã³ã«ã¢ã¯ã»ã¹ãã¾ãã
$ curl localhost:8080/jfr-test/sleep sleep[10] sec $ curl localhost:8080/jfr-test/heavy fib[46]: 1836311903 , done
è¨é²ããã³ããã¾ãã
$ jcmd [PID] JFR.dump [PID]: Dumped recording, 602.2 kB written to: /path/to/hotspot-pid-24986-2024_12_15_16_23_19.jfr
ãã³ãããã¨ãè¨é²ãåºåããããã¡ã¤ã«ãã¹ã表示ãããããã§ãã
â»ä»åã®PIDã¯24986ã§ãã
è¨é²ãåæ¢ãã¾ãã
$ jcmd [PID] JFR.stop [PID]: Command executed successfully
JDK Mission Controlã§ã®çµæã®ç¢ºèªã¯çç¥ãã¾ãã
ãªããjcmdã§JDK Flight Recorderã®æä½ãè¡ãå ´åããªãã·ã§ã³ã¯ã¹ãã¼ã¹åºåãã§æå®ããããã§ãã
$ jcmd [PID] JFR.start filename=jmc-recording.jfr duration=1m dumponexit=true
æå®å¯è½ãªãªãã·ã§ã³ã«ã¤ãã¦ã¯ããã¥ã¡ã³ãã確èªãã¾ãããã
JDK Mission ControlããJDK Flight Recorderãæä½ãã
æå¾ã¯JDK Mission ControlããJDK Flight Recorderã®æä½ãè¡ã£ã¦ã¿ã¾ãã
ã¢ããªã±ã¼ã·ã§ã³ã¯-XX:StartFlightRecording
ãã¤ããã«èµ·åãã¦ããã¾ãã
$ java -jar target/jdk-flight-recorder-example-0.0.1-SNAPSHOT.jar
JDK Mission Controlã®JVMãã©ã¦ã¶ãè¦ãã¨ããã¼ã«ã«ã§å®è¡ãã¦ããJava VMããã»ã¹ã®ä¸è¦§ãè¦ããã¨ãã§ãã¾ãã
â»ãªã¢ã¼ããã§ãããã§ã
å±éããã¨ãããã©ã¤ãã»ã¬ã³ã¼ãããç¾ãã¾ãããã¡ããè¨é²ã¯ããã¾ããã
ããã§ããã©ã¤ãã»ã¬ã³ã¼ãããå³ã¯ãªãã¯ãã¦ããã©ã¤ãè¨é²ã®éå§ããé¸ã¶ã¨ãè¨é²ãéå§ã§ããããã«ãªãã¾ãã
ãã¡ã¤ã«åã¯ããã©ã«ãã§ã¯èªåã§æ±ºã¾ãã¾ãããè¨å®ãããã¨ãã§ãã¾ãã
ãçµäºããæ¼ãã¨è¨é²ãéå§ãããJVMãã©ã¦ã¶ã§ãè¨é²ãè¡ããã¦ãããã¨ããããã¾ãã
ä»åã¯è¨é²æéãæå®ããã®ã§ãçµäºããã¨èªåã§åæçµæã«ç§»ãã¾ãã
ã¡ãªã¿ã«JVMãã©ã¦ã¶ã®æ¹ã¯ãè¨é²ãããã¾ãããã«æ»ãããã§ããããã«è¡¨ç¤ºãããã®ã¯ãè¨é²ä¸ã®ãã®ã¿ããã§ããã
ä»åº¦ã¯é£ç¶è¨é²ã«ãã¦ã¿ã¾ããããä¸ã«æ¸ããã¦ãã¾ãããé£ç¶è¨é²ã®å ´åã¯æ示çãªãã³ãæä½ãå¿ è¦ã«ãªãã¾ãã
ãçµäºããæ¼ãã¦è¨é²ãéå§ããã¨ãè¨é²ãç¾ãã¾ããæ®ãæéãç¡é大ã«ãªã£ã¦ãã¾ãã
ãã®è¨é²ãå³ã¯ãªãã¯ãã¦ãã³ãæä½ãè¡ãã¾ããè¨é²å ¨ä½ããã³ãããããç¯å²ãçµã£ã¦ãã³ããããã§ããããã§ãã
è¨é²å ¨ä½ããã³ãããã¨ãããã«è¨é²ã®åæçµæã表示ããã¾ãã
ã¾ããå³ã¯ãªãã¯ã§ããã³ããæä½ãé¸ã¶ã¨ãããªæãã§ç´°ããèããã¾ããããè¨é²å
¨ä½ããã³ããã¾ãããé¸ã¶ã¨ãã®ã¾ã¾åæçµæã
表示ãã¦ããã¾ãã
è¨é²ãåå¾ãçµãã£ããããè¨é²ããå³ã¯ãªãã¯ãã¦åæ¢ãã¦ããã¾ãããã
ããã§JDK Flight Recorderã«ããè¨é²ãåæ¢ãã¾ãã
ãããã«
JDK Flight Recorderã¨JDK Mission Controlã試ãã¦ã¿ã¾ããã
å®ã¯ã¡ããã¨ä½¿ã£ã¦ãã¦ãªãã£ãã®ã§â¦ãããæ©ã«ä½¿ã£ã¦ããããã«ãããã§ããã