[Openmp-dev] Enabling OMPT by default

Jonas Hahnfeld via Openmp-dev openmp-dev at lists.llvm.org
Mon Dec 18 05:23:56 PST 2017

Adding Paul, maybe he can help here. Though switching the default for 
x86/x86_64 and ppc64 doesn't mean it has to work on AArch64 for the 6.0 
release, it will just stay deactivated as for MIPS(64).


Am 2017-12-18 13:02, schrieb Cownie, James H via Openmp-dev:
> The ARM folks should chip in. This should clearly be tested on AARCH64 
> as well!
> -- Jim
> Jim Cownie <james.h.cownie at intel.com>
> SSG/DPD/TCAR (Technical Computing, Analyzers, and Runtimes)
> Tel: +44 117 9071438
> -----Original Message-----
> From: Openmp-dev [mailto:openmp-dev-bounces at lists.llvm.org] On Behalf
> Of Joachim Protze via Openmp-dev
> Sent: Monday, December 18, 2017 11:58 AM
> To: Openmp-dev <openmp-dev at lists.llvm.org>
> Subject: [Openmp-dev] Enabling OMPT by default
> Dear all,
> OpenMP 5.0 will introduce OMPT, the OpenMP tools interface. The current
> implementation in the LLVM/OpenMP runtime is at the level of OpenMP 
> TR6,
> as published in November (with some known issues, were we have patches
> under review).
> Currently, this feature is deactivated by default 
> According to overhead measurements performed by Intel and on some of 
> our
> machines, this feature introduces a worst case runtime overhead of ~4%,
> but for most cases basically no overhead.
> As I understood, some of the build-bots run the tests when the feature
> is enabled. We locally test the changes continuously with different
> compiler versions (icc/gcc/clang), but only on x86_64 architecture.
> Further, this feature was tested on ppc64.
> How should we proceed to enable this feature by default, and get it
> tested on other architectures?
> For the 6.0 release, I would like to enable OMPT at least for the
> supported platforms x86/x86_64 and ppc64.
> We would also appreciate collaboration with vendors/users of other
> platforms, to ensure the code is running there.
> Typically, only the architecture specific offset needs to be added:
> https://github.com/llvm-mirror/openmp/blob/master/runtime/test/ompt/callback.h#L95
> Looking forward to your feedback,
> Joachim
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