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Add note about C2 compiler in dev-mode #38635

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Feb 7, 2024
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Add note about C2 compiler in dev-mode #38635

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5 changes: 5 additions & 0 deletions docs/src/main/asciidoc/dev-mode-differences.adoc
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Expand Up @@ -102,12 +102,17 @@

In contrast, in a production application the main objective for Quarkus is to consume the least amount of memory and startup in the smallest amount of time.
Thus, when running the production application, build time operations are not performed (by definition) and various infrastructure classes needed at build time are not present at all at runtime.
Furthermore, the purpose built ClassLoader that comes with the xref:maven-tooling.adoc#fast-jar[fast-jar] package type ensures that class lookup is done as fast as possible while also keeping

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GitHub Actions / Linting with Vale 

[vale] reported by reviewdog 🐶
[Quarkus.TermsWarnings] Consider using 'includes' rather than 'comes with' unless updating existing content that uses the term.

Raw Output:
{"message": "[Quarkus.TermsWarnings] Consider using 'includes' rather than 'comes with' unless updating existing content that uses the term.", "location": {"path": "docs/src/main/asciidoc/dev-mode-differences.adoc", "range": {"start": {"line": 105, "column": 49}}}, "severity": "WARNING"}

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GitHub Actions / Linting with Vale 

[vale] reported by reviewdog 🐶
[Quarkus.TermsSuggestions] Depending on the context, consider using 'because' or 'while' rather than 'as'.

Raw Output:
{"message": "[Quarkus.TermsSuggestions] Depending on the context, consider using 'because' or 'while' rather than 'as'.", "location": {"path": "docs/src/main/asciidoc/dev-mode-differences.adoc", "range": {"start": {"line": 105, "column": 154}}}, "severity": "INFO"}
the minimum amount of jars in memory.

[NOTE]
====
Since optimal performance is never an objective of dev mode, in the interest of improving startup time, the JVM's C2 compiler is disabled in dev mode.
====

== Security implications

Perhaps the most important reason why dev mode applications should not be run in production is that the dev mode allows reading information that could be confidential (via the Dev-UI)

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GitHub Actions / Linting with Vale 

[vale] reported by reviewdog 🐶
[Quarkus.SentenceLength] Try to keep sentences to an average of 32 words or fewer.

Raw Output:
{"message": "[Quarkus.SentenceLength] Try to keep sentences to an average of 32 words or fewer.", "location": {"path": "docs/src/main/asciidoc/dev-mode-differences.adoc", "range": {"start": {"line": 115, "column": 1}}}, "severity": "INFO"}

Check warning on line 115 in docs/src/main/asciidoc/dev-mode-differences.adoc

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GitHub Actions / Linting with Vale 

[vale] reported by reviewdog 🐶
[Quarkus.TermsWarnings] Consider using 'through', 'by', 'from', 'on', or 'by using' rather than 'via' unless updating existing content that uses the term.

Raw Output:
{"message": "[Quarkus.TermsWarnings] Consider using 'through', 'by', 'from', 'on', or 'by using' rather than 'via' unless updating existing content that uses the term.", "location": {"path": "docs/src/main/asciidoc/dev-mode-differences.adoc", "range": {"start": {"line": 115, "column": 169}}}, "severity": "WARNING"}
while also giving access to operations that could be destructive (either by exposing endpoints that should not be available in production application or via the Dev-UI).

== Native executable
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