https://github.com/hurricup/intellij-perf-viewer

Perf snapshot viewer for IntelliJ IDEA profiler
https://github.com/hurricup/intellij-perf-viewer

Last synced: 21 days ago
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Perf snapshot viewer for IntelliJ IDEA profiler

• Host: GitHub
• URL: https://github.com/hurricup/intellij-perf-viewer
• Owner: hurricup
• License: apache-2.0
• Created: 2023-10-12T13:05:07.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2024-11-28T05:30:39.000Z (about 1 month ago)
• Last Synced: 2024-11-28T06:26:20.357Z (about 1 month ago)
• Language: Kotlin
• Size: 479 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Intellij [`perf`](https://perf.wiki.kernel.org/index.php/Main_Page) Snapshots Viewer 

This is a reader for the script representation of the [`perf`](https://perf.wiki.kernel.org/index.php/Main_Page) snapshots 

in Intellij profiler.

![image](https://github.com/hurricup/intellij-perf-viewer/assets/2811330/9170d0a1-d1bd-49be-9d0f-44f3288707e1)

# Disclaimer

- I created this plugin by the way, it was not the main goal, I just needed a nice viewer. 

- It is provided as is. 

- I may fix things, but currently there are no plans to continue development.

- It works only in commercial products from JetBrains (ones have profiling support)

- Some symbols may be unknown (looks like `Interpreter+0x....`). This is caused by incomplete perfmap from JVM, not sure why.

# How to make a JVM app snapshot to load

1. Start your java process with 

   ```

   -XX:+PreserveFramePointer 

   -XX:+UnlockDiagnosticVMOptions 

   -XX:+DebugNonSafepoints

   ```

2. Sample the app. Following samples with 500 hz, `$PID` or `$TID` for 60 seconds, recording output to the `perf.data`:

    ```bash

    sudo perf record -F 500 -p $PID [-t $TID] -g -o perf.data -- sleep 60

    ```

    Additional options can be found on the [`perf` wiki](https://perf.wiki.kernel.org/index.php/Main_Page).

4. Create a map for java calls and perf addresses, **BEFORE finishing the process**:

    ```bash

    jcmd $PID Compiler.perfmap

    ```

    Alternatively you can run process with `-XX:+DumpPerfMapAtExit`

4. Create a plain text report (going to be pretty large):

    ```bash

    perf script -i perf.data > perf.script

    ```

5. Load `perf.script` with `Open Profiler Snapshot` action.