[Bug 281765] llvm - ThinLTO never uses more than a single thread by default
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Date: Mon, 07 Oct 2024 09:00:58 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281765
David Chisnall <theraven@FreeBSD.org> changed:
What |Removed |Added
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CC| |theraven@FreeBSD.org
--- Comment #3 from David Chisnall <theraven@FreeBSD.org> ---
(In reply to Dimitry Andric from comment #2)
> The reason for this was that lld was using way too many threads on many-core machines: nowadays just creating "hw.ncpu" threads is no longer a good default.
I don't believe this is true (unless RAM is not properly scaled with core
count). The problem is build systems that try to parallelise link jobs.
Building LLVM with PARALLEL_LINK_JOBS=1, the upstream default remains the right
one. Building FreeBSD, it is not.
The fix for this in the bmake system is probably to wrap lld in a shell script
that acquires a lock, invokes lld, and then releases the lock and exits with
lld's exit code.
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