Hi Even
I have looked at cpl_multiproc.cpp implementation and I believe that I cannot use multithreading for the mbtiles conversion (even if I define GDAL_NUM_THREADS) The compilation of cpl_multiproc.cpp depends on several compilation flags : · CPL_MULTIPROC_STUB · CPL_MULTIPROC_WIN32 · CPL_MULTIPROC_PTHREAD · CPL_MULTIPROC_NONE If none of them is defined, then CPL_MULTIPROC_STUB is defined automatically which means that multithreading is disabled (thread creation does not work). I am using windows binaries of gdal I get from this site : GISInternals Support Site<https://www.gisinternals.com/release.php> It seems that none of these symbols have been defined for this build process I guess I would have to recompile gdal in order to enable multithreading… Regards Christophe
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