[llvm-dev] [help] How to speed up compilation?

[Sunghyun Park via llvm-dev]

I'm adding feature to detect customized pragma and mark those region in
LLVM IR using Metadata. I want to let programmer give additional directives
to compiler.
So I put some functions, variables, and 'cout' on clang.

So, based on my understanding on your comment, it may be natural to have
long compilation time.
My machine has Intel Xeon(R) CPU E31230 @ 3.20GHz * 8 with 8GM RAM, which
is far behind the recommended build environment ( Intel Core i7-4770K CPU @
3.50Hz, 16 GM RAM, and a 1TB 7200RPM HDD or SSD, ref :
https://blogs.s-osg.org/an-introduction-to-accelerating-your-build-with-clang/
)
Do you think it would be great help if I upgrade my machine?
I've wanted to upgrade it at some point, but I haven't find right excuse to
tell my boss. haha

Thank you so much!

On Tue, Oct 18, 2016 at 1:08 PM, Renato Golin <renato.golin at linaro.org>
wrote:

> On 18 October 2016 at 17:56, Sunghyun Park <sunggg at umich.edu> wrote:
> > Personally, it feels like compilation become much slower than previous
> > versions after adopting 'cmake'.
> > Is this natural when we adopt cmake or are there other big changes on
> build
> > structure?
>
> So, I decided not to respond to that specific part of your original
> post because I don't have enough information on what you changed, but
> we have deprecated autoconf for a while now, so everyone uses CMake.
>
> If you're comparing LLVM a long time ago with autoconf versus LLVM
> today with CMake, then the changes are most likely because LLVM has
> grown a lot.
>
> If you're building LLVM trunk today with autoconf, then it's possible
> that you're missing a lot of source files from your build (and I'm
> surprised it worked).
>
> But overall, CMake should make absolutely no difference in building
> speeds, since the number of compilation jobs should (hopefully) be the
> same and in the same way. But I may be missing something... :)
>
> cheers,
> --renato
>



-- 
Best, Sung
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