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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Problem with tasks, eating cpu cycle while idle"
href="https://bugs.llvm.org/show_bug.cgi?id=33543">33543</a>
</td>
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<th>Summary</th>
<td>Problem with tasks, eating cpu cycle while idle
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Runtime Library
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>northon_patrick3@yahoo.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>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
{
std::this_thread::sleep_for(30s);
}
#pragma omp taskwait
}
}
std::cout << "Done." << '\n';
getchar();
return 0;
}
My system is running Fedora 25.</pre>
</div>
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