[Mono-dev] Compiling mono with Clang/LLVM

Miguel de Icaza miguel at novell.com
Fri Apr 23 15:16:05 EDT 2010


I assume that some pretty key pieces of Mono, such as the GC, are in C so I
> am surprised to hear that you would not expect much bang for buck if the C
> performance improved.  I was especially interested in how System.Drawing
> might be impacted since I believe that libgdiplus is C.

You raise good points.   They might be useful there.

Which only goes to prove that we need someone to do a full run and see what
the results are ;-)


> I built Mono 2.6.4 with Clang/LLVM trunk on OpenSUSE 11.2 and I noticed
> that
> TLS was normal instead of __thread so that is a strike against Clang/LLVM
> at
> this point I would think.
> I assume the article you are talking about is the recent Phoronix
> benchmark.
> I saw that after posting and, I agree, it seemed to indicate that
> Clang/LLVM
> was mostly lagging recent GCC in performance and was certainly a lot more
> unpredictable in terms of results.
> It might just make sense to wait for a little more consistency from
> Clang/LLVM before benchmarking or considering it for anything real.  That
> same article seemed to show a pretty nice performance lead when compiling
> so
> Clang/LLVM is worth keeping an eye  on though.
> --
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