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README

perfomance-glance

How to find out the modules needed by jlink

Uncomment the maven-dependency-plugin plugin in pom.xml:

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>${maven.dependency.plugin.version}</version>
                <executions>
                    <execution>
                        <id>copy-dependencies</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${project.build.directory}/libs</outputDirectory>
                            <overWriteReleases>false</overWriteReleases>
                            <overWriteSnapshots>false</overWriteSnapshots>
                            <overWriteIfNewer>true</overWriteIfNewer>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

Then run the following commands in a terminal window:

mvn verify
jdeps --ignore-missing-deps -q -recursive --multi-release 21 \
  --print-module-deps --class-path 'target/libs/*' target/spring-todo-app.jar

How to start the setup

Place yourself in the root directory and run :

docker-compose up --build

You can access the following endpoints:

Application	Local Endpoint
Todo App	http://localhost:8080
Prometheus	http://localhost:9090
Grafana	http://localhost:300

Now create some requests by running:

sh scripts/load.sh

How to detect missing JVM NativeMemoryTracking flag

Please take a look at /scripts/flag.sh and:

sh scripts/flag.sh

How to track Native Memory Used

Run

sh scripts/track.sh

How to query stats

Run

sh scripts/query.sh

Prometheus

Look at CPU Load Machine Total vs HTTP server requests

rate(jdk_CPULoadmachineTotal[1m]) 
or rate(http_server_requests_seconds_sum{method="POST", uri="/api/todo"}[1m]) 
or rate(http_server_requests_seconds_sum{method="GET", uri="/api/todo"}[1m]) 
or rate(http_server_requests_seconds_sum{method="PUT", uri="/api/todo"}[1m])
or rate(http_server_requests_seconds_sum{method="DELETE"}[1m])

Look at Garbage Collection Longest Pause vs HTTP server requests

rate(jdk_GarbageCollectionlongestPause[1m]) 
or rate(http_server_requests_seconds_sum{method="POST", uri="/api/todo"}[1m]) 
or rate(http_server_requests_seconds_sum{method="GET", uri="/api/todo"}[1m]) 
or rate(http_server_requests_seconds_sum{method="PUT", uri="/api/todo"}[1m])
or rate(http_server_requests_seconds_sum{method="DELETE"}[1m])

Look at Garbage Collection Sum of Pauses vs HTTP server requests

rate(jdk_GarbageCollectionsumOfPauses[1m]) 
or rate(http_server_requests_seconds_sum{method="POST", uri="/api/todo"}[1m]) 
or rate(http_server_requests_seconds_sum{method="GET", uri="/api/todo"}[1m]) 
or rate(http_server_requests_seconds_sum{method="PUT", uri="/api/todo"}[1m])
or rate(http_server_requests_seconds_sum{method="DELETE"}[1m])

Look at GCHeapSummary Heap Used

rate(jdk_GCHeapSummaryheapUsed[1m]) 
or rate(http_server_requests_seconds_sum{method="POST", uri="/api/todo"}[1m]) 
or rate(http_server_requests_seconds_sum{method="GET", uri="/api/todo"}[1m]) 
or rate(http_server_requests_seconds_sum{method="PUT", uri="/api/todo"}[1m])
or rate(http_server_requests_seconds_sum{method="DELETE"}[1m])

Extension points exported contracts — how you extend this code

TodoRepository (Interface)

(no doc)

src/main/java/org/acme/example/repository/TodoRepository.java

Core symbols most depended-on inside this repo

getId

called by 9

src/main/java/org/acme/example/model/Todo.java

getContent

called by 4

src/main/java/org/acme/example/model/Todo.java

toString

called by 4

src/main/java/org/acme/example/model/Todo.java

getOwner

called by 3

src/main/java/org/acme/example/model/Todo.java

getOwner

called by 1

src/main/resources/static/js/controller.js

extractJDKGCToGauge

called by 1

src/main/java/org/acme/example/ApplicationStartup.java

extractJDKCpuLoadToGauge

called by 1

src/main/java/org/acme/example/ApplicationStartup.java

matches

called by 1

src/main/java/org/acme/example/jfr/PathProcessorControl.java

Shape

Method 39

Class 10

Function 1

Interface 1

Languages

Java98%

TypeScript2%

Modules by API surface

src/main/java/org/acme/example/model/Todo.java13 symbols

src/test/java/org/acme/example/TodoApplicationTest.java6 symbols

src/main/java/org/acme/example/controller/TodoController.java6 symbols

src/main/java/org/acme/example/jfr/PathProcessorControl.java5 symbols

src/main/java/org/acme/example/jfr/FlightRecorderFilter.java4 symbols

src/main/java/org/acme/example/jfr/CustomMetricsListener.java4 symbols

src/main/java/org/acme/example/ApplicationStartup.java4 symbols

src/main/java/org/acme/example/jfr/JFRConfig.java3 symbols

src/main/java/org/acme/example/jfr/RestEndpointInvocationEvent.java2 symbols

src/main/java/org/acme/example/TodoApplication.java2 symbols

src/main/resources/static/js/controller.js1 symbols

src/main/java/org/acme/example/repository/TodoRepository.java1 symbols

For agents

$ claude mcp add performance-glance \
  -- python -m otcore.mcp_server <graph>

⬇ download graph artifact

github.com/ammbra/performance-glance @main

perfomance-glance

How to find out the modules needed by jlink

How to start the setup

How to detect missing JVM NativeMemoryTracking flag

How to track Native Memory Used

How to query stats

Prometheus

Look at CPU Load Machine Total vs HTTP server requests

Look at Garbage Collection Longest Pause vs HTTP server requests

Look at Garbage Collection Sum of Pauses vs HTTP server requests

Look at GCHeapSummary Heap Used

Extension points exported contracts — how you extend this code

Core symbols most depended-on inside this repo

Shape

Languages

Modules by API surface

For agents

Ask about this repo answers extend the page