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Add note about C2 compiler in dev-mode
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Relates to: #38575
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@geoand @gsmet
geoand authored and gsmet committed Feb 7, 2024
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Expand Up @@ -105,6 +105,11 @@ Thus, when running the production application, build time operations are not per
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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[Quarkus.TermsWarnings] Consider using 'includes' rather than 'comes with' unless updating existing content that uses the term.

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{"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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[Quarkus.TermsSuggestions] Depending on the context, consider using 'because' or 'while' rather than 'as'.

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{"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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[Quarkus.SentenceLength] Try to keep sentences to an average of 32 words or fewer.

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{"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"}

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

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{"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"}
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