Cetus Compiler Installation Guide

Using bgclang on Vesta, Mira and Cetus The bgclang compiler is a version of the LLVM/Clang compiler customized for the BG/Q supercomputer environment. If you have access to ALCF's Vesta, Mira and Cetus systems, bgclang is installed for you. You can use the softenv keys: +mpiwrapper-bgclang bgclang wrappers and toolchain +mpiwrapper-bgclang.legacy bgclang.legacy wrappers and toolchain to have the corresponding MPI wrappers added to your path. Experimental MPI version 3 support is also available using the softenv keys: +mpiwrapper-bgclang-mpi3 bgclang MPI3 wrappers and toolchain +mpiwrapper-bgclang-mpi3.legacy bgclang.legacy MPI3 wrappers and toolchain +mpiwrapper-bgclang-mpi3.legacy.ndebug bgclang.legacy.ndebug MPI3 wrappers and toolchain +mpiwrapper-bgclang-mpi3.ndebug bgclang.ndebug MPI3 wrappers and toolchain​​. MPI and other wrappers On an ALCF system (or any other system with a similar setup), the MPI wrapper scripts and other related programs can be easily added to your PATH (see the description of the ALCF softenv keys above). These wrappers are: mpicc - The MPI C99 compiler mpic++ and mpicxx - The MPI C++03 compiler mpic++11 and mpicxx11 - The MPI C++11 compiler To use bgclang without using the MPI wrappers: bgclang (or powerpc64-bgq-linux-clang) - The C99 compiler bgclang++ (or powerpc64-bgq-linux-clang++) - The C++03 compiler bgclang++11 (or powerpc64-bgq-linux-clang++11) - The C++11 compiler To compile code using the C++14 standard, use bgclang++11 and pass the -std=gnu++14 (or -std=c++14) flag. OpenMP bgclang fully supports the OpenMP 3.1 specification, and most OpenMP 4 features are supported.

To enable OpenMP support, pass the -fopenmp flag when both compiling and linking. Note that bgclang's OpenMP runtime library (derived from Intel's open-source implementation) is different from that used by powerpc64-bgq-linux-gcc and bgxlc, and linking the OpenMP runtime library from either of those two compilers with an application compiled with bgclang -fopenmp will likely result in runtime failures. Vector (QPX) intrinsics and math functions bgclang supports the same QPX vector intrinsics (vec_add, etc.) as IBM's compiler, and it understands the vector4double type. No special flags or header files are required to enable this support. Bgclang also comes with a vector math library (derived from Naoki Shibata's SLEEF library). To use this library, include the qpxmath.h header.

Installing P3DFFT. The latest version of P3DFFT can be found here. Once you have extracted the package, you must take the following steps to complete the setup: Run the configure script. Run 'make install'.

The bgclang wrapper scripts automatically handle linking to the vector math library, so no special linking flags are required. Autovectorization bgclang's autovectorization support is enabled by default with the optimization flag -O3. Allah karam allah karam naat mp3 free download full. There are two types of autovectorization used by bgclang: Loop autovectorization (which can be disabled using -fno-vectorize) and SLP autovectorization (which can be disabled using -fno-slp-vectorize) for the autovectorization of non-loop code.

Bgclang can currently transform calls to the following standard library (libm) math functions into calls to its vector math library as part of the autovectorization process: acos, acosh, asin, asinh, atan, atan2, atanh, cbrt, cos, cosh, exp, exp10, exp2, expm1, log, log10, log1p, pow, sin, sinh, tan, tanh, along with the single-precision versions. Also sqrt (and division), but only with -ffast-math.

For sin, cos, tan, asin, acos, atan, atan2, log faster (but slightly less accurate) variants are used with -ffast-math. Dynamic linking Static linking is recommended on the BG/Q, and bgclang will link statically by default. Bgclang does support dynamic linking and the creation of shared libraries (.so files). When creating a shared library, you must compile all object files using the -fPIC flag, and you must link using the -shared flag.

When creating a dynamically-linked application (the executable that uses shared libraries), you must use the -dynamic flag. Note: If you're building a dynamically-linked executable using the CMake build system, run cmake with the flag -DCMAKE_SKIP_RPATH=ON; failure to do this might result in the build system stripping necessary RUNPATH attributes from your executable as part of the installation process.