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  1. The hidden performance cost of accessing thread-local variables ...

    https://software.intel.com/en-us/blogs/2011/05/02/the-hidden-performance-cost-of-accessing-thread-local-variables

    May 2, 2011 ... The hidden performance cost of accessing thread-local variables ... to start the code optimization by running Intel® VTune™ Amplifier XE Lightweight ... It is a Linux kernel function to get the address of a thread-local variable.

  2. Compile-time checking of uninitialized variables

    https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/498784

    ... each routine to be sure that nothing depends on local variables being initialized to zero. ... Use -save (Linux and Mac OS X) or [. ... .com/en-us/articles/ dont-optimize-when-using-ftrapuv-for-uninitialized-variable-detection ).

  3. Loop variable optimized away

    https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/494741

    Nov 27, 2013 ... The problem is, my loop variable for the OpenMP do loop is getting optimized away when ... Home › Forums › Intel® Software Development Products › Intel® Fortran Compiler for Linux* and Mac OS X* · Facebook ... Info: symbol i is defined but not allocated (optimized away) ..... 29 ! allocate local result array ...

  4. Intel® Optimized LINPACK Benchmark for Linux* OS | Intel® Software

    https://software.intel.com/en-us/node/528615

    Intel® Optimized LINPACK Benchmark is a generalization of the LINPACK 1000 benchmark. It solves a dense ( real *8) system of linear equations (Ax=b), ...

  5. Overview of the Intel Optimized MP LINPACK Benchmark | Intel ...

    https://software.intel.com/en-us/node/528620?language=ru

    Developer Guide for Intel® Math Kernel Library 2017 Update 1 for Linux* ... Managing Behavior of the Intel(R) Math Kernel Library with Environment Variables ... The Intel Optimized MP LINPACK Benchmark can be used for TOP500 runs (see ...

  6. Don't optimize when using -ftrapuv for uninitialized variable detection

    https://software.intel.com/en-us/articles/dont-optimize-when-using-ftrapuv-for-uninitialized-variable-detection

    Jan 6, 2011 ... Operating System : Windows*, Linux*, Mac OS* X ... The switch /Qftrapuv (-ftrapuv ) sets local, scalar variables that are not otherwise initialized ...

  7. Volatile: Almost Useless for Multi-Threaded Programming | Intel ...

    https://software.intel.com/en-us/blogs/2007/11/30/volatile-almost-useless-for-multi-threaded-programming

    Nov 30, 2007 ... marking a local variable in the scope of a setjmp so that the variable does not ... Sometimes programmers think of volatile as turning off optimization of ..... The source I found most useful is the Linux kernel memory barriers, ...

  8. Heterogeneous Support in the Intel Optimized MP LINPACK ...

    https://software.intel.com/en-us/node/528626

    Developer Guide for Intel® Math Kernel Library 2017 Update 1 for Linux* ... Managing Behavior of the Intel(R) Math Kernel Library with Environment Variables ... Intel Optimized MP LINPACK Benchmark achieves heterogeneous support by ...

  9. Contents of the Intel® Optimized LINPACK Benchmark | Intel ...

    https://software.intel.com/en-us/node/528616

    Developer Guide for Intel® Math Kernel Library 2017 Update 1 for Linux* ... Managing Behavior of the Intel(R) Math Kernel Library with Environment Variables ... The Intel Optimized LINPACK Benchmark for Linux* OS contains the following ...

  10. Intel® MPI Library Collective Optimization on the Intel® Xeon Phi ...

    https://software.intel.com/en-us/articles/intel-mpi-library-collective-optimization-on-intel-xeon-phi

    Dec 18, 2015 ... The methodology for MPI collective optimization, when using Intel MPI ... is linked with Intel® MPI Library for execution on the Linux* or Windows* OS, ... The I_MPI_ADJUST environment variable is available for both Intel and ...

  11. Fortran Compiler Options ifort(1)

    https://software.intel.com/sites/default/files/m/f/8/5/8/0/6366-ifort.txt

    -auto Causes all local, non-SAVEd variables to be allo cated on the run-time stack .... The default on Linux systems is -no-cxxlib, which tells the compiler to use the .... This restricts optimization because it causes the com piler to treat most math ...

  12. Offloading to Intel Xeon Phi Coprocessors | Intel® Software

    https://software.intel.com/en-us/node/528633

    Intel Optimized MP LINPACK Benchmark reacts to MKL_MIC_ENABLE and ... environment variables for automatic offload to Intel Xeon Phi coprocessors. They also ... Developer Guide for Intel® Math Kernel Library 2017 Update 1 for Linux*.

  13. Optimization question: Using temporary variables instead of direct ...

    https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/560332

    In it the author always uses temporary variables to restrict access to ... Software Development Products › Intel® Fortran Compiler for Linux* and Mac OS X* .... Nor does the attraction to Fortran 90 help with optimization, e.g..

  14. idb, ifort - usefulness optimized away

    https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/268835

    I get far to often the result because variables have been optimiezd away ... Local variables as well as function/subroutine arguments are not ...

  15. Getting Started with Intel Optimized HPCG | Intel® Software

    https://software.intel.com/en-us/node/599526

    Developer Guide for Intel® Math Kernel Library 2017 Update 1 for Linux* .... On a cluster file system, unpack the Intel Optimized HPCG package to a directory ... libraries are available through the LD_LIBRARY_PATH environment variable.

  16. Seek debug tips for crash, when using optimized code; no crash ...

    https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/268392

    Try compiling some sources with lower optimization. Add log code to follow the .... definition of local variables. Everything is with compiled with ...

  17. Optimizing Without Breaking a Sweat | Intel® Software

    https://software.intel.com/en-us/articles/optimizing-without-breaking-a-sweat

    Mar 13, 2012 ... This article describes novel techniques developed to optimize ... The Linux* loader's LD_PRELOAD environment variable forces loading a shared ..... 03, # map to make the symbols visibility local (versus the default global).

  18. Intel® Optimized MP LINPACK Benchmark for Clusters | Intel ...

    https://software.intel.com/en-us/node/528619

    Developer Guide for Intel® Math Kernel Library 2017 Update 1 for Linux* ... Managing Behavior of the Intel(R) Math Kernel Library with Environment Variables ... Usage Modes of Intel Optimized MP LINPACK Benchmark for Intel® Xeon Phi™ ...

  19. Other Environment Variables | Intel® Software

    https://software.intel.com/en-us/node/528806

    Intel® MPI Library Developer Reference for Linux* OS ... Local Options · Extended Fabric Control Options · Hydra Environment Variables · Cleanup Utility; Checkpoint-Restart Support ... Output Intel MPI-specific environment variables. 6 .... Optimize for the oldest supported Intel® Architecture Processor across all nodes.

  20. Versions of the Intel Optimized HPCG | Intel® Software

    https://software.intel.com/en-us/node/599525

    The Intel Optimized HPCG package includes prebuilt HPCG benchmark for Intel ... /redistributables-for-intel-parallel-studio-xe-2015-composer-edition-for-linux).

For more complete information about compiler optimizations, see our Optimization Notice.