[llvm-dev] LLVM build performance with LLVM

David Blaikie via llvm-dev llvm-dev at lists.llvm.org
Thu Jan 2 18:01:57 PST 2020

Were you trying to use a Debug build to build LLVM? Yes, that would be very

If you mean you were using a release build of LLVM to build a Debug build
of LLVM - yeah, that's generally going to be recommended. Did this get
slower/change significantly in performance? Many people have trouble with
building Debug builds (no matter the host compiler) especially if they're
using bfd-ld, since it's quite slow/uses a lot of memory. There are a few
other issues to do with memory usage (do you have less than about a GB of
RAM per CPU? Then you'll probably hit swapping by default & have a bad time
- there are ways around that)

On Thu, Jan 2, 2020 at 5:42 PM Itaru Kitayama via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
> When building LLVM, is it always recommended to do it with the
> latest official release, currently, it is 9.0.1? I ask because when I tried
> it with a Debug build, it took an enormous amount of time on POWER8.
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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