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Reduce the default number of CGUs for incremental. #111666

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Reduce the default number of CGUs for incremental. #111666

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2 changes: 1 addition & 1 deletion compiler/rustc_session/src/session.rs
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Expand Up @@ -1229,7 +1229,7 @@ impl Session {
// codegen units in order to reduce the "collateral damage" small
// changes cause.
if self.opts.incremental.is_some() {
return 256;
return 64;
}

// Why is 16 codegen units the default all the time?
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2 changes: 1 addition & 1 deletion config.example.toml
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Expand Up @@ -434,7 +434,7 @@ changelog-seen = 2
# compiler.
#
# Uses the rustc defaults: https://doc.rust-lang.org/rustc/codegen-options/index.html#codegen-units
#codegen-units = if incremental { 256 } else { 16 }
#codegen-units = if incremental { 64 } else { 16 }

# Sets the number of codegen units to build the standard library with,
# regardless of what the codegen-unit setting for the rest of the compiler is.
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2 changes: 1 addition & 1 deletion src/doc/rustc/src/codegen-options/index.md
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Expand Up @@ -40,7 +40,7 @@ also produce slower code. Setting this to 1 may improve the performance of
generated code, but may be slower to compile.

The default value, if not specified, is 16 for non-incremental builds. For
incremental builds the default is 256 which allows caching to be more granular.
incremental builds the default is 64 which allows caching to be more granular.

## control-flow-guard

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