Vector throws bad_alloc

Question

I have the following code that throws an exception std::bad_alloc:

std::vector<std::vector<double>> myVector(nlines);
    for(int i = 0; i < nlines; i++)
    {
        try
        {
            std::vector<double> iVector(ncolumns);
            myVector[i] = iVector;
        }
        catch (std::exception& e)
        {
            /* catches a bad_alloc here */
        }
    }
}

This code works when it nlinesis around 500,000 ( ncolumnsusually less than 10), but when I tried this in a full-sized dataset, where nlines= 2,600,000, I get a bad_alloc exception.

I have 12 GB of memory and I look at the use of my memory when the program starts, it goes from 28% (before launch) to 42% (when an exception is raised). So it looks like I still have available memory.

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Answer 1

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