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A comment on Go 1.21 Released. Parent comment

Re:Go 1.21 Released by mighmi on Tuesday August 08, 2023 @07:30PM (#37056851)
It seems like it rebuilds itself with PGO. I can't tell if I'm being paranoid/didn't only include stdlib in something, but I ran some random programs, restarted my computer and the install is now at 320mb, vs. 213 when I first untarred it.

https://go.dev/doc/pgo

> PGO in Go applies to the entire program. All packages are rebuilt to consider potential profile-guided optimizations, including standard library packages.

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Re:Go 1.21 Released by 38 on Tuesday August 08, 2023 @07:54PM (#37057050)
PGO is opt in, just like Rust. you have to explicitly tell the compiler that you want to use it.
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Re:Go 1.21 Released by yencabulator on Saturday August 12, 2023 @05:23PM (#37104350)
Go1.21 uses PGO by default, if the file default.pgo exists.

> The -pgo build flag now defaults to -pgo=auto, and the restriction of specifying a single main package on the command line is now removed. If a file named default.pgo is present in the main package's directory, the go command will use it to enable profile-guided optimization for building the corresponding program.

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