Hi! I'm trying to implement the listranking problem (known also by shortcutting) with omp to have the sums prefixes of the array W. I don't know if i use correctly the flush pragma.. And i have a warning when compiling "barrier region may not be closely nested inside of work-sharing, critical, ordered, master or explicit task region" #i...
How can I get OpenMP set up in VC++ 2008? The compiler supports it, I believe I am only missing headers/libs. Can I obtain them similar to how the framework SDK can be added to VC++ Express for MFC development? ...
I have written a library in C using a variety of the #pragma omp directives to parallelize execution. I am on Mac OS X 10.6. I have then wrapped these functions in a JNI library and called them from my Java application. It seems that calls to native functions containing OpenMP directives crash with EXC_BAD_ACCCESS if they are called fr...
i have preparaed the data for haartraining.but i cant get the way to train using openMP in windows.please, help me. ...
Hi,I added openMp code to some serial code in a simulator applicaton, when I run a program that uses this application the program exits unexpectedly with the output "The thread 'Win32 Thread' (0x1828) has exited with code 1 (0x1)", this happens in the parallel region where I added the OpenMp code, here's a code sample: #pragma omp para...
please help me to make this code parallel using openmp this code is run on button click and the text box is 128 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace IMG { public partial class For...
Why does this code not parallelize std::for_each() when it works perfectly fine with std::sort()? How do I fix it? g++ -fopenmp -D_GLIBCXX_PARALLEL=1 -o p p.cc && time ./p sort GCC 4.3 on Linux. #include <cstdio> #include <algorithm> #include <vector> #include <cstring> void delay() { for(int c = 0; c < 1000000; c++) { ...
I compile this bit of code on Snow Leopard and linux and I get different results. On Snow leopard, the first call of omp_get_max_threads returns 2, which is my number of cores, while the second returns 1. On linux, both calls return 4, which is my number of cores. I think Linux has the correct behavior, am I right? Are both correct a...
Why would enabling OpenMp for a certain application return this error message "Fatal User Error 1002: Not all work-sharing constructs executed by all threads" when I try to run it on Visual Studio? This happens without even adding any parallel constructs, and it only happens with this application, meaning when I try to execute other appl...
Hi All, Question on OpenMP for multi-threaded code: Are all global variables shared by the threads? How does one make certain global variable private to master thread? Thanks PS: It is a C code. ...
Hi all, I need some advise and help for re-compiling of an existing C project (which is a huge project) on a solaris8-sparc platform with "OpenMP". The point is i m not familiar neither with compiling nor parallel programing issues. With a little google search i see that sun-studio 11 and 12 has openMP infrastructure already. so how can...
I just started learning how to use OpenMP. I am trying to figure out why the following code does not run in parallel with Visual Studio 2008. It compiles and runs fine. However it uses only one core on my quad core machine. This is part of the code that I am trying to port to a MATLAB mex function. Any pointer is appreciated. #pragma om...
hello all, is it suitable parallelizing loops containing function call(s). or is it much more convenient parallelization of loops which are doing basic operation inside. for example is it suitable putting parallelization directives as below ? main(){ .. #omp paralel .. for (i=0;i<100;i++){ a[i] = foo(&datatype , ...); ... } .. } int ...
Hi, I just wonder how to convert the following openMP program to a MPI program #include <omp.h> #define CHUNKSIZE 100 #define N 1000 int main (int argc, char *argv[]) { int i, chunk; float a[N], b[N], c[N]; /* Some initializations */ for (i=0; i < N; i++) a[i] = b[i] = i * 1.0; chunk = CHUNKSIZE; #prag...
Hi, I want to parallelize a loop in a class member function. However there are two errors in the code: class myclass { public: int _k; void f(int nb_examples, int nb_try) { int i; int ks[nb_try]; // assignment to elements in ks omp_set_num_threads(_nb_threads); #pragma omp parallel shar...
Hi, I have a program using OpenMP to parallelize a for-loop. Inside the loop, the threads will write to shared variable, so I need to synchronize them. However I can sometimes get either segment fault or double free or corruption error. Anyone knows what happens? Thanks and regards! Here is the code: void KNNClassifier::classify_variou...
I'm fairly new to OpenMP and I'm trying to start an individual thread to process each item in a 2D array. So essentially, this: for (i = 0; i < dimension; i++) { for (int j = 0; j < dimension; j++) { a[i][j] = b[i][j] + c[i][j]; What I'm doing is this: #pragma omp parallel for shared(a,b,c) private(i,j) reduction(+:diff)...
Hi, I am parallelizing several separated for-loops using OpenMP. While debugging in gdb, I found that the multiple threads are created when the running reaches the first parallel region. The multiple threads exited at the end of running the whole program. This is contrary to what I think about the split-join model of OpenMP, where thre...
I have a large C++ program that modifies the FPU control word (using _controlfp()). It unmasks some FPU exceptions and installs a SEHTranslator to produce typed C++ exceptions. I am using VC++ 9.0. I would like to use OpenMP (v.2.0) to parallelize some of our computational loops. I've already successfully applied it to one, but the n...
Hi, I am using OpenMP in my Visual Studio projects and currently thinking very seriously in changing to QT creator. (Doesn't Visual Studio suck?,I expect much more from Microsoft) But anyway... Does QT creator support OpenMP? In case of that, what should I do to enable it? Or maybe is enabled by default? Do I need to do something speci...