<div>Hi Andreas and all :</div>
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<div>Most people are using<font size="2"> the C++ version of Ipopt and love the C++ version. However, recntly, I did a comprehsensive numerical testing comparsions of C++ version of Ipopt (3.4.1) vs Fortran version of Ipopt on Linux 64 bit machine (Intel LX8664)). I found that the Fortran version of Ipopt is 50% to 100% faster than C++ version for all 20+ optimization problems. Fortran and C++ Ipopt code are used by its default algorithm and parameters. Thus, it is a "Apple to Apple" comparsion. Those two code are also compiled by "optimized code" (using version 9.1.043 of Intel C++ and version 9.1.036 of Intel Fortran) and MA27 is used for both C++ and Fortran version testing.</font></div>
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<div><font size="2"> Do you observe the slow performance of C++ version vs Fortran Ipopt? Is the slow issue due to "C++" coding (vs Fortran coding)? How can we speed up the C++ version of Ipopt (any help from C++ compiler) ?</font></div>
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<div><font size="2">Best regards,</font></div>
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<div><font size="2">Mike</font></div>