[llvm-bugs] [Bug 33543] New: Problem with tasks, eating cpu cycle while idle

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Jun 21 05:54:03 PDT 2017


            Bug ID: 33543
           Summary: Problem with tasks, eating cpu cycle while idle
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: northon_patrick3 at yahoo.ca
                CC: llvm-bugs at lists.llvm.org

When creating tasks with #pragma omp task, threads not executing any tasks will
eat cpu cycles.

Minimal example:

#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <thread>
#include <omp.h>

using namespace std::chrono_literals;

int main(int argc, char **argv)
        #pragma omp parallel
                #pragma omp single
                        #pragma omp task

                        #pragma omp taskwait

        std::cout << "Done." << '\n';

        return 0;

My system is running Fedora 25.

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