Multithreading support in OpenFHE

Library Questions
2

Under the hood OpenFHE already uses OpenMP and it defaults to the max number of threads. To see open mp being used in the code check out openfhe-development/src/core/lib/math/matrix.cpp where you can see the #pragma omp parallel for being used.

template <class Element>
Matrix<Element>& Matrix<Element>::operator-=(Matrix<Element> const& other) {
    if (rows != other.rows || cols != other.cols) {
        OPENFHE_THROW(math_error, "Subtraction operands have incompatible dimensions");
    }
#pragma omp parallel for   // <- HERE
    for (size_t j = 0; j < cols; ++j) {
        for (size_t i = 0; i < rows; ++i) {
            data[i][j] -= other.data[i][j];
        }
    }

    return *this;
}

Another user was looking at using direct multithreading Multi-threading ciphertext multiplication and bootstrapping but I’m not sure if it’s applicable to you. Also feel free to check out CMakeLists.txt to see the CMake that relates to openmp