[Llvm-bgq-discuss] New bgclang nighty builds (and other updates)

[Hal Finkel]

----- Original Message -----
> From: "Mark Abraham" <mark.j.abraham at gmail.com>
> To: "Hal Finkel" <hfinkel at anl.gov>
> Cc: llvm-bgq-discuss at lists.alcf.anl.gov
> Sent: Tuesday, March 24, 2015 12:35:20 PM
> Subject: Re: [Llvm-bgq-discuss] New bgclang nighty builds (and other updates)
> 
> 
> Hi Hal,
> 
> 
> Thanks very much for the update & effort.
> 

You're very welcome.

> 
> I tried out the default bgclang 3.6.0 on vesta, but found a bunch of
> the GROMACS SIMD-layer unit tests failing. These need correct QPX
> vector intrinsics available. From memory, things worked fine with
> bgclang in ~August last year, but I no longer have those results. Is
> there a simple way I can compile on vesta with older bgclang to see
> where a problem might lie? Otherwise / depending what I learn, I'll
> break out a debugger.

The old builds are still all installed. Just use the MPI wrappers from:

/home/projects/llvm/<whatever>/mpi/bgclang/bin -- I don't know exactly which build you were using in August of last year, r209570-20140527 maybe?

 -Hal

> 
> 
> Thanks,
> 
> 
> Mark
> 
> 
> 
> 
> On Fri, Mar 20, 2015 at 12:15 AM, Hal Finkel < hfinkel at anl.gov >
> wrote:
> 
> 
> Hello everyone,
> 
> First, let me apologize to everyone, this is a few months late...
> but, hopefully, this will never be a problem again...
> 
> I now have a system setup which automatically pulls in upstream
> changes and tries to merge those with the bgclang-specific patches,
> and then builds the resulting suite of bgclang RPMs. When this
> succeeds, the RPMs should be posted automatically to:
> 
> http://www.mcs.anl.gov/~hfinkel/bgclang/
> (note that installing a build from here now also requires both the
> 'stage1' and 'stage2' RPMs as well)
> 
> The first such nightly build, r232720-20150319, has been posted to
> that page.
> 
> And, for the curious, the local repositories used for version control
> are now mirrored to github:
> 
> https://github.com/hfinkel/clang-bgq
> https://github.com/hfinkel/llvm-bgq
> https://github.com/hfinkel/bgclang-aux
> https://github.com/hfinkel/compiler-rt-bgq
> https://github.com/hfinkel/libcxx-bgq
> https://github.com/hfinkel/openmp-bgq
> https://github.com/hfinkel/sleef-bgq
> 
> Compared to the latest "released" version (r220548-20141024), the
> most-recent nightly build does show some performance regressions,
> and there are a few things I've not even tested yet (LTO, ASan,
> etc.), but it also contains a number of bug fixes and improvements,
> so feel free to test on your applications.
> 
> One particular noteworthy improvement is that our OpenMP runtime
> library now has affinity support enabled. This means that all of the
> OpenMP 4 affinity features should work, and also that the default
> thread<->core bindings are now sensible.
> 
> The bgclang wrapper script no longer disables 'fast-isel' instruction
> selection at -O0, so your debug builds should now be faster too.
> Also, the automated vectorization of math functions using our SLEEF
> library adaptation is controlled using the new -fveclib flag (so the
> wrapper script contains -fveclib=SLEEF, and you can add
> -fveclib=none to turn it off if desired for whatever reason).
> 
> Also, the core QPX support has been contributed upstream (although
> not yet the Clang-level intrinsics support); so if you're using LLVM
> as a library, and want to just build from upstream sources instead
> of depending on the bgclang builds, that is now possible.
> 
> Thanks again everyone, and please let me know if you experience any
> difficulties,
> Hal
> 
> --
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory
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> 
> 

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory