health-report

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Single-file program that illustrates how the JFR streaming API can be used.

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- - MANIFEST.MF
- HealthReport.java
.gitignore
README.md
Usage.md

// repository documentation

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# Description

Health Report is a Java program that demonstrates the JFR Event Streaming API.

It's both a Java agent and a Java file that can be launched as a single-file program. The agent runs alongside with an ordinary Java application and prints data produced by JFR to standard out.

Health report requires JDK 17, or later, and only works with OpenJDK/Oracle JDK.

For a demonstration see:

https://youtu.be/E9K5m1HXMSc?t=367

Example output:

<pre>
=================== HEALTH REPORT === 2021-05-13 23:57:50 ====================
| GC: G1Old/G1New         Phys. memory: 28669 MB    Alloc Rate: 8 MB/s       |
| OC Count    : 28        Initial Heap: 448 MB      Total Alloc: 190 MB      |
| OC Pause Avg: 40.1 ms   Used Heap   : 19 MB       Thread Count: 20.0       |
| OC Pause Max: 48.8 ms   Commit. Heap: 47 MB       Class Count : 3894.0     |
| YC Count    : 8         CPU Machine   :  20.12 %  Safepoints: 335          |
| YC Pause Avg: 5.7 ms    CPU JVM User  :  10.28 %  Max Safepoint: 46.4 ms   |
| YC Pause Max: 22.4 ms   CPU JVM System:   1.07 %  Max Comp. Time: 728.3 ms |
|--- Top Allocation Methods ------------------------------- -----------------|
| DataBufferInt.<init>(int)                                                11.27 % |
| Component.size()                                                    9.01 % |
| BufferedContext.validate(...)                                       6.21 % |
| Path2D$Double.<init>(...)                                                 5.87 % |
| SunGraphics2D.clone()                                               5.85 % |
|--- Hot Methods ------------------------------------------------------------|
| DRenderer._endRendering(int, int)                                  51.11 % |
| DRenderer.copyAARow(...)                                            6.67 % |
| Arrays.fill(...)                                                    4.44 % |
| StringConcatFactory.doStringConcat(...)                             2.22 % |
| MarlinTileGenerator.getAlphaNoRLE(...)                              2.22 % |
==============================================================================
</pre>

# Build Instructions

$ cd src
    $ javac HealthReport.java
    $ jar cmf META-INF/MANIFEST.MF health-report.jar .

# Getting Started

To run Health Report as a Java agent:

$ java -javaagent:health-report.jar com.example.MyApplication

To run Health Report as a single-file program:
  
    $ java HealthReport.java <source>

The source is where events are streamed from. It can be a Java process, a repository directory, a network address, a JMX service URL, a recording file, or itself.
 
    $ java HealthReport.java MyApplication
    $ java HealthReport.java --debug MyApplication
    $ java HealthReport.java --scroll MyApplication
    $ java HealthReport.java --timeout 5 MyApplication
    $ java HealthReport.java com.example.MyApplication
    $ java HealthReport.java example.module/com.example.MyApplication
    $ java HealthReport.java application.jar
    $ java HealthReport.java /programs/application.jar
    $ java HealthReport.java 4711
    $ java HealthReport.java /repository/
    $ java HealthReport.java /repository/2021_03_30_09_48_31_60185
    $ java HealthReport.java example.com:7091
    $ java HealthReport.java 127.0.0.1:7092
    $ java HealthReport.java [0:0:0:0:0:0:0:1]:7093
    $ java HealthReport.java service:jmx:rmi:///jndi/rmi://com.example:7091/jmxrmi
    $ java HealthReport.java recording.jfr
    $ java HealthReport.java /directory/perf.jfr
    $ java HealthReport.java --replay-speed 10 recording.jfr
    $ java HealthReport.java self

If the source is a network address of a JMX management agent, Health Report starts a recording on the host. If the source is a process identifier (PID), a local management agent is started, from which a recording is initiated. Otherwise, the recording must be started manually, for example using -XX:StartFlightRecording.

If a stream can't be created, for example, if the source process hasn't started yet, Health Report will retry until the source becomes available. This is convenient when the program being monitored is frequently started and stopped.

For more detailed information, see [usage](https://github.com/flight-recorder/health-report/blob/master/Usage.md).

# Known issues

##### The timestamp is missing

The displayed timestamp at the top of Health Report comes from jdk.Flush event which is not enabled when using -XX:StartFlightRecording. If Health Report is running as a Java agent, or it connects over JMX, it is automatically enabled. It is not possible to turn the event on when streaming from a directory or a file.

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