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OpenMP slower than no OpenMP

Here is a Friday post that has a sufficient lack of information that will probably be impossible to answer.  I have some older Fortran code I'm trying to improve the performance of.

Authored by joe Last updated on 09/28/2018 - 14:18
Forum topic

OpenMP teams synchronization

Hi. I have a question about synchronization OpenMP thread teams. I would like to write code where only one threads team do caltulation at the time, eg: time 0 -> team 0

Authored by Kamil H. Last updated on 01/04/2019 - 14:10
Forum topic

OpenMP and MKL

Hello,

I have a program where at one point I call a function.

Authored by Gordon F. Last updated on 06/24/2016 - 12:29
Forum topic

Fortran Openmp offload error

Hi everyone,

I am doing some fortran openmp code offloading in MIC.In compilation time I am getting the below error messages.Please help me.

Authored by Last updated on 01/04/2019 - 14:10
Forum topic

BLAS, openMP and Phi

 

Hi,

Is it possible to implement BLAS library on Intel Phi in such a way that each thread in openMP calls a BLAS function on different data sets independently?

Authored by Last updated on 01/04/2019 - 14:10
Forum topic

MPI/openMP segmentation error

Hello,

when I run my program on two nodes, and set the number of threads larger than 1 (i.e., 2-16 threads), I've encountered the segmentation error:

Authored by Last updated on 02/16/2017 - 19:44
Forum topic

OpenMP Tasks + Offload possible?

Hi,

when I offload a parallel region, my OpenMP tasks are not executed, is this intended?

Authored by Last updated on 01/04/2019 - 14:10
Forum topic

OpenMP spinning time

Hello,

I am using a simple Merge Sort benchmark on the Xeon Phi. 78% of the total CPU time is consumed by "libiomp5.so"

Authored by Last updated on 01/04/2019 - 14:10
Forum topic

Xeon Phi - OpenMP Teams

Hi. I have some problem. I write aplication for Intel Xeon Phi (61 cores), which does stencil calculation using 2D matrix (five-point stencil). I would like to use OpenMP 4.0 teams.

Authored by Last updated on 01/04/2019 - 14:10
Forum topic

OpenMP overhead on KNL

I just wrote test code on KNL using openmp. But I feel really confused about the result.

The code is as below:

Authored by Zekun Y. Last updated on 01/04/2019 - 14:10