I run gdal2tiles on debian machine with 4 cores:

sudo /usr/bin/gdal2tiles.py -r cubic -a 0,0,0 -z 10-15 /home/adm/topo/ekb.vrt  /var/www/tiles

In htop I see:

enter image description here

Why does gdal use only one core in work? Gdal version is 2.1.2.

up vote 14 down vote accepted

That's because gdal2tiles is single-threaded. You can use a parallelized version available at https://github.com/GitHubRGI/geopackage-python/blob/master/Tiling/gdal2tiles_parallel.py

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