Quarkus native heap dump on OOME blog post #1942
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Can we add @roberttoyonaga as reviewer? |
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🙈 The PR is closed and the preview is expired. |
| 2024-04-12 09:58:00,855 INFO [io.quarkus] (main) Installed features: [cdi, rest, smallrye-context-propagation, vertx] | ||
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| Next, apply some load to the HTTP endpoint exposed by the Quarkus application, for example using `wrk`: |
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Perhaps a bash loop with a curl command would be better as most people won't have wrk installed. On the other hand that's a nice way to become aware of wrk.
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Good point, wrk is an overkill for this. Just used to quickly firing it up :)
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| Let’s start by producing a heap dump with a Quarkus native executable. | ||
| A good starting point would be a Quarkus application that simply responds to an HTTP endpoint request, e.g. the | ||
| https://github.com/quarkusio/quarkus-quickstarts/tree/main/getting-started-reactive[getting-started-reactive] Quarkus quickstart. |
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Perhaps it's simpler to use https://code.quarkus.io/
E.g. I can follow this post with:
wget "https://code.quarkus.io/d?S=io.quarkus.platform%3A3.8&cn=code.quarkus.io" -O code.zip
unzip code.zip
cd code-with-quarkus
Note I explicitly set the version to Quarkus 3.8 to hopefully keep the instructions working for some time.
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| Starting with GraalVM for JDK 21, | ||
| native executables can run with the `-XX:+HeapDumpOnOutOfMemoryError` option to generate a heap dump when a `java.lang.OutOfMemoryError` is thrown. | ||
| In this blog post we will explore how to use the flag, we will inspect what a native image heap dump looks like and how it compares with one produced by HotSpot. |
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we will inspect what a native image heap dump looks like
Maybe there's a chance readers get confused by the wording here and think dumping the Image Heap and "java heap" are different things (If they are aware that the image heap exists).
Maybe it would be good to specify that we're dumping both the read-only Image Heap as well as the native image's "Java heap". Whereas in Java mode we're just dumping the Java heap.
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On the flip side, it could also be an opportunity to briefly inform readers who aren't aware that there is a special segmentation to the heap in native mode.
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Both points sound good. I have not explored the differences in detail between the read-only and the read/write parts, but if you have feel free to propose a paragraph and add it as suggestion and we can just add it.
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ok I've added a suggestion below!
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@zakkak I've addressed all your comments. @roberttoyonaga I've integrated your suggestion and made some small changes to it, let me know if you're happy with it. |
Looks good to me! |
galderz
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Squashed and pushed commits. |
| layout: post | ||
| title: 'Obtaining heap dump on OutOfMemoryError with Quarkus native' | ||
| date: 2024-04-15 | ||
| tags: native heapdump oome epsilongc jol |
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I don't think it's a good idea to add tags that are so precise. We already have too many tags. Let's only have native?
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| layout: post | ||
| title: 'Obtaining heap dump on OutOfMemoryError with Quarkus native' | ||
| date: 2024-04-15 |
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Let's target a publication on Tuesday? We can merge tomorrow and get it published automatically on Tuesday and tweet about it on Tuesday? Friday is a slow day for blog posts.
Note that if you want it published tomorrow, I'm around!
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Tuesday is fine, I'll ammend it.
Co-authored-by: Foivos <[email protected]> Co-authored-by: Robert Toyonaga <[email protected]> Co-authored-by: Guillaume Smet <[email protected]>
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@gsmet Applied all suggested changes and changed date to next Tuesday. |
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If you write me a tweet, I will be happy to post it on Tuesday. |
Sure, how about this?
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LGTM. Let me put a reminder for Tuesday. |
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@galderz What's your Twitter handle? |
Blog post on how to use heap dump on OOME option with Quarkus native which touches a few extra related topics: