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

Fri Mar 20 06:21:43 CDT 2015

Hi Hal,

Thanks, you’re right, that was it. I used an old version of the script that sets the updated toolchain directory, but now it works.

Michael

On 20 Mar 2015, at 12:03 , Hal Finkel <hfinkel at anl.gov<mailto:hfinkel at anl.gov>> wrote:

Hi Michael,

I'm unable to replicate this problem in a simple test. In the past, "undefined reference to `vtable for std::nested_exception'" has almost always meant that you're not picking up the GCC 4.7.2 toolchain files. Can you run that linking command with -v and make sure that you are (or send me the output)?

Thanks again,
Hal

P.S. Thanks for posting your script; I'm sure that others will find it useful.

----- Original Message -----
From: "Michael Schlottke" <m.schlottke at fz-juelich.de<mailto:m.schlottke at fz-juelich.de>>
To: "Hal Finkel" <hfinkel at anl.gov<mailto:hfinkel at anl.gov>>
Cc: llvm-bgq-discuss at lists.alcf.anl.gov<mailto:llvm-bgq-discuss at lists.alcf.anl.gov>
Sent: Friday, March 20, 2015 5:44:27 AM
Subject: Re: [Llvm-bgq-discuss] New bgclang nighty builds (and other updates)

Hi everyone,

First of all, thanks a lot Hal, for the continued development of
bclang and the maintenance of the easy-to-install RPMs.
Unfortunately, linking does not seem to work with r232720-20150319
and our code on JUQEEN:

Linking CXX executable zfs
/bgsys/local/clang/r232720-20150319/r232720-20150319/libc++/lib/libc++.a(exception.cpp.o):(.toc+0x0):
undefined reference to `vtable for std::nested_exception'
/bgsys/local/clang/r232720-20150319/r232720-20150319/binutils/bin/ld:
/bgsys/drivers/V1R2M2/ppc64/gnu-linux/powerpc64-bgq-linux/lib/libc.a(clone.o):
In function `__clone':
(.text+0x98): call to `_exit' lacks nop, can't restore toc; recompile
with
-fPIC/bgsys/local/clang/r232720-20150319/r232720-20150319/binutils/bin/ld:
final link failed: Bad value
clang: error: linker command failed with exit code 1 (use -v to see
invocation)

Any idea what the source of the problem could be? The only change we
made is to switch from r220548-20141024 to the current nightly
build.

Regards,

Michael

P.S.: At JSC we use a set of install scripts to download and install
the newest bgclang version. I finally got around to putting them on
GitHub, so if anyone is interested, have a look at
https://github.com/sloede/install-bgq . Please note that while the
scripts should work on any BG/Q installation, they are only tested
on JUQUEEN so far.

--
Michael Schlottke

SimLab Highly Scalable Fluids & Solids Engineering
Jülich Supercomputing Centre (JSC)
Forschungszentrum Jülich GmbH
52425 Jülich
Germany

Phone: +49 (2461) 61 2326
Mail: m.schlottke at fz-juelich.de<mailto:m.schlottke at fz-juelich.de>
Web: http://www.fz-juelich.de/jsc

On 20 Mar 2015, at 00:15 , Hal Finkel < hfinkel at anl.gov<mailto: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
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