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    <p>Changing the first OpenMP loop from 1000000 to 2000000 will cause the same error. This indicates that the out of memory problem is with OpenMP stack limit.</p> <p>Try setting the OpenMP stack limit to unlimit in bash with</p> <pre><code>ulimit -s unlimited </code></pre> <p>You can also change the OpenMP environment variable OMP_STACKSIZE and setting it to 100MB or more.</p> <p>UPDATE 1: I change the first loop to</p> <pre><code>{ std::vector&lt;std::vector&lt;int*&gt; &gt; nts(100); #pragma omp for schedule(static) ordered for(int begin = 0; begin &lt; int(nts.size()); ++begin) { for(int i = 0; i &lt; 2000000; ++i) { nts[begin].push_back(new int(5)); } } std::cout &lt;&lt; " pre delete " &lt;&lt; std::endl; for(int begin = 0; begin &lt; int(nts.size()); ++begin) { for(int j = 0; j &lt; nts[begin].size(); ++j) { delete nts[begin][j] } } } </code></pre> <p>Then, I get a memory error at i=1574803 on the Main thread.</p> <p>UPDATE 2: If you are using the Intel compiler, you can add the following to the top of your code and it will solve the problem (providing you have enough memory for the extra overhead).</p> <pre><code>std::cout &lt;&lt; "Previous stack size " &lt;&lt; kmp_get_stacksize_s() &lt;&lt; std::endl; kmp_set_stacksize_s(1000000000); std::cout &lt;&lt; "Now stack size " &lt;&lt; kmp_get_stacksize_s() &lt;&lt; std::endl; </code></pre> <p>UPDATE 3: For completeness, like mentioned by another member, if you are performing some numerical computation, it is best to preallocate everything in a single <strong>new float[1000000]</strong> instead of using OpenMP to do 1000000 allocations. This applies to allocating objects as well.</p>
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    1. POMemory leak when using OpenMP
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    1. COWhen you change the first loop to 2000000, what's the total allocated size for the process when it fails to allocate new memory?
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    2. COi=1574803 when it crashes. See my UPDATE 1.
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    3. CO@Dat Chu So without using Intel compiler (i.e. using gcc) the OMP_STACKSIZE env var setting is the way to go because the kmp_set_stacksize_s() is not available in gcc?
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