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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

    ... more helpful if the compiler had a compile-time check for use of uninitialized variables. ... 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. Intel® Optimized LINPACK Benchmark for Linux* | Intel® Software

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

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

  4. Common block variables, debugger, <no value>

    https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/268860

    Jan 15, 2008 ... Then I also noticed that access to all local variables disappears if the code was ... has been optimized away (despite the fact that the ifort option -O0 was ... variable of the same common block, while the Linux version cannot.

  5. Running the Intel Optimized MP LINPACK Benchmark | Intel ...

    https://software.intel.com/en-us/node/528627

    Developer Guide for Intel® Math Kernel Library 2017 Update 2 for Linux* .... To run the Intel Optimized MP LINPACK Benchmark on multiple nodes or on one ... Load the necessary environment variables for the Intel MPI Library and Intel® ...

  6. 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 ... ... Intel® Software Development Products › Intel® Fortran Compiler for Linux* ... However, my debug messages indicate that my loop variable is going beyond 1, and idbc reports when I'm inside the loop. (idb) print i. Info: symbol i is defined but not allocated (optimized away) ..... 29 ! allocate local result array ...

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

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

    On a cluster file system, unpack the Intel Optimized HPCG package to a directory ... libraries are available through the LD_LIBRARY_PATH environment variable. ... /redistributables-for-intel-parallel-studio-xe-2015-composer-edition-for-linux).

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

    https://software.intel.com/en-us/node/528620

    Developer Guide for Intel® Math Kernel Library 2017 Update 2 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 ...

  9. 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 ... Sometimes programmers think of volatile as turning off optimization of ...

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

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

    The Intel Optimized LINPACK Benchmark for Linux* contains the following files, located in the ./benchmarks/linpack/ subdirectory of the Intel® Math Kernel ...

  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. 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 ...

  13. Setting Environment Variables | Intel® Software

    https://software.intel.com/en-us/node/528499

    Parent topic: Getting Started Scripts to Set Environment Variables. ... Developer Guide for Intel® Math Kernel Library 2017 Update 2 for Linux* .... For more complete information about compiler optimizations, see our Optimization Notice.

  14. Is it a GDB bug or Intel Compiler bug or my code?

    https://software.intel.com/en-us/forums/intel-c-compiler/topic/549771

    Apr 14, 2015 ... Does it looks like a compiler problem where a local static variable badf_errcnt which was optimized into CPU registers, is assigned a memory ...

  15. 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 2 for Linux* ... Managing Behavior of the Intel(R) Math Kernel Library with Environment Variables ... Intel Optimized MP LINPACK Benchmark achieves heterogeneous support by ...

  16. 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 2 for Linux*.

  17. Overview of the Intel Optimized HPCG | Intel® Software

    https://software.intel.com/en-us/mkl-linux-developer-guide-overview-of-the-intel-optimized-hpcg

    Developer Guide for Intel® Math Kernel Library 2018 (Beta) for Linux* ... Managing Behavior of the Intel(R) Math Kernel Library with Environment Variables ... Optimized High Performance Conjugate Gradient Benchmark (Intel® Optimized HPCG) ... systems of equations and incorporates a local and symmetric Gauss-Seidel ...

  18. Known Limitations of the Intel® Optimized LINPACK Benchmark ...

    https://software.intel.com/en-us/mkl-linux-developer-guide-known-limitations-of-the-intel-optimized-linpack-benchmark

    ... limitations are known for the Intel Optimized LINPACK Benchmark for Linux*: ... Developer Guide for Intel® Math Kernel Library 2018 (Beta) for Linux* ... Managing Behavior of the Intel(R) Math Kernel Library with Environment Variables.

  19. 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).

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

    https://software.intel.com/en-us/mkl-linux-developer-guide-versions-of-the-intel-optimized-hpcg

    The Intel Optimized HPCG package includes prebuilt HPCG benchmark for ... Managing Behavior of the Intel(R) Math Kernel Library with Environment Variables ... /redistributables-for-intel-parallel-studio-xe-2015-composer-edition- for-linux).

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