[ssh123]

Recently I re-implement my C++ code in Java and realize that the Java execution is faster than the C++ one ! The code takes a gmsh .msh file and convert it to .dat Tecplot file and .vtk file (Paraview).

With JDK 8 my Java code took ~2.6 seconds, whereas the C++ version took:
~5 seconds (MinGW g++ 10.2 with -O3 optimization flag).
~2.8 seconds (MinGW g++ 4.9.2 with -O3 optimization flag).

Key point could be the performance of C++ vector and Java List interface.

Have you ever faced similar situation?

Edited: Looks like this is a bug of MinGW g++ 10.2. My C++ implementation is just slightly slower than Java although it's heavily object oriented.

Ps: I have posted my code to GitHub so that you can have better judgement.
C++: https://github.com/truongd8593/GmshToVtkAndTecplotCpp11
Java: https://github.com/truongd8593/MisaCFDJava