Re: PSA: GHC can now be built with Clang

Yes. We have some direct contacts with the llvm apple dev team. Austin and or I will be following up with them soon. On Wednesday, June 26, 2013, Manuel M T Chakravarty wrote:

Austin Seipp javascript:;>:

...

* HEAD will correctly work with Clang 3.4svn on both Linux, and OS X. * I have a small, 6-line patch to Clang to fix the build failure in primitive (Clang was too eager to stringify something.) Once this fix is integrated into Clang (hopefully very soon,) it will be possible to build GHC entirely including all stage2 libraries without any patches. The patch is here: http://llvm.org/bugs/show_bug.cgi?id=16371 - I am hoping this will also make it into XCode 5.

Xcode 5 DP2's tools are still based on 3.3svn.

...

As for the infamous ticket #7602, the large performance regression on Mac OS X, I have some numbers finally between my fast-TLS and slow-TLS approach.

./gc_bench.slow-tls 19 500000 5 22 +RTS -H180m -N7 -RTS 395.57s user 173.18s system 138% cpu 6:50.71 total

vs

./gc_bench.fast-tls 19 500000 5 22 +RTS -H180m -N7 -RTS 322.98s user 132.37s system 132% cpu 5:44.65 total

Now, this probably looks totally awful from a scalability POV. And, well, yeah, it is. But I am almost 100% certain there is something extremely screwy going on with my machine here. I base this on the fact that during gc_bench, kernel_task was eating up about ~600% of my CPU consistently, giving user threads no time to run. I've noticed this with other applications that were totally unrelated too (close tweetbot -> 800% CPU usage,) so I guess it's time to learn DTrace. Or turn it on and off again or something. Ugh.

Anyway, if you look at the user times, you get a nice 30% speedup which is about what we expect!

I'm very glad to hear that!

Manuel

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