Auto merge of rust-lang#129222 - saethlin:more-incr-cgus, r=<try>

bors · bors · commit ff1120a1998b · 2024-08-18T01:46:38.000Z
Use more CGUs in incremental compilation

Just wondering how this looks in perf...

r? `@ghost`
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
@@ -841,7 +841,7 @@ impl Session {
         // codegen units in order to reduce the "collateral damage" small
         // changes cause.
         if self.opts.incremental.is_some() {
-            return CodegenUnits::Default(256);
+            return CodegenUnits::Default(4096);
         }
 
         // Why is 16 codegen units the default all the time?

Original file line number	Diff line number	Diff line change
`@@ -841,7 +841,7 @@ impl Session {`
`841`	`841`	`// codegen units in order to reduce the "collateral damage" small`
`842`	`842`	`// changes cause.`
`843`	`843`	`if self.opts.incremental.is_some() {`
`844`		`- return CodegenUnits::Default(256);`
	`844`	`+ return CodegenUnits::Default(4096);`
`845`	`845`	`}`
`846`	`846`
`847`	`847`	`// Why is 16 codegen units the default all the time?`