OpenMP*

Intel Software Conference 2014

 A Intel Software Brasil realizou neste mês o Intel Software Conference 2014, que aconteceu na Universidade Estácio de Sá (Rio de Janeiro) nos dias 26 e 27 de Maio e no IMAM (São Paulo) nos dias 28,29 e 30 de Maio.

Foram realizadas palestras e "round tables" ministradas por profissionais da Intel do Brasil, Estados Unidos e Alemanha cobrindo dois temas: Computação Paralela e de Alto Desempenho nos primeiros quatro dias (RJ e SP) e Desenvolvimento Android no último dia (somente em São Paulo).  

Confira logo abaixo os slides das apresentações realizadas.

  • Entwickler
  • Partner
  • Professoren
  • Studenten
  • Android*
  • Linux*
  • Server
  • C#
  • C/C++
  • Fortran
  • Experten
  • Fortgeschrittene
  • Cluster Tools
  • Intel® Parallel Studio XE
  • Intel® Advanced Vector Extensions
  • Intel® Streaming SIMD Extensions
  • Message Passing Interface
  • OpenCL*
  • OpenMP*
  • Optimierung
  • Parallel Computing
  • Vektorisierung
  • Unable to deallocate allocatable array in openmp

    Hi, guys. I'm a new hand of openmp. I encounter some problems related to deallocating allocatable array in openmp loop.

    The main reason is the array is too large. An example code is following:

    program omptest
    use omp_lib
    implicit none
    INTEGER :: I,k,J
    integer,pointer :: b(:)
    
    
    !$OMP PARALLEL DO PRIVATE(i,b,k) 
    DO I=1,2490000
       allocate(b(67214259))
       k=OMP_get_thread_num()
       deallocate(b)
    END DO
    !$OMP END PARALLEL DO 
    END PROGRAM

    When the maximum bound of i is large, like 2490000, the program will break at deallocate(b)

    Submissions open: High Performance Parallelism Gems

    We have all had our little discoveries and triumphs in identifying new and innovative approaches that increased the performance of our applications. Occasionally we find something more, something that could also help others, an innovative gem. You now have an opportunity to broadcast your successes more widely to the benefit of our community. You are invited to submit a proposal to a contribution-based book, working title, “High Performance Parallelism Gems – Successful Approaches for Multicore and Many-core Programming” that will focus on practical techniques for Intel® Xeon® processor and Intel® Xeon Phi™ coprocessor parallel computing. Submissions are due by May 29, 2014.

    GCC* 4.9 OpenMP code cannot be linked with Intel® OpenMP runtime

    GCC* 4.9 was released on April 22, 2014.  This release now supports Version 4.0 of the OpenMP* specification for the C and C++ compilers.  The interface between the compilers and the GCC OpenMP runtime library (libgomp) was changed as part of this development.  As a result, code compiled by GCC 4.9 using the –fopenmp compiler option cannot be successfully linked with the Intel® OpenMP runtime library (libiomp5), even if it uses no new OpenMP 4.0 features.   Linki

  • Entwickler
  • Linux*
  • Server
  • C/C++
  • Fortgeschrittene
  • Intel® C++ Composer XE
  • OpenMP GCC libiomp5 libgomp
  • OpenMP*
  • Parallel Computing
  • Problem on ARM

    Hi

    I have successfully cross compiled libiomp5.so for ARM using clang and arm-linux-gnueabihf toolchain. Then I cross compiled a simple openmp program with libiomp5.so. But when I tried to run the program on ARM, I got a problem. The program is:

    #include
    #include
    #include
    int main(int argc, char** argv)
    {
    int i = 0;
    #pragma omp parallel for
    for(i = 0; i < 10; i++) {
    int tid = omp_get_thread_num();
    printf("hello from thread %d\n", tid);
    }
    return 0;
    }

    OpenMP* abonnieren