Facing the “Too many open files” error

iota2 may open a lot of files at the same time to complete a run. With some distribution configuration, the error Too many open files the solution is to increase the number of files that can be opened at the same time thanks to the command :

ulimit -u #inform you about the current limit (ie : 4096)
ulimit -u 5000 # increase user limit to 5000

More information at : https://linuxhint.com/permanently_set_ulimit_value/


If your are using Sentinel-1 data, you have to fill the parameter srtm which is the path that contains DEM files. If you are facing the Too many open files, try to reduce the content of this directory as much as possible.

Warning about parameters when the chain start

These warnings implies that the parameter is detected but not known by iota2. If you are not using a particular branch, ensure that your parameters are correct by looking at the corresponding builder:

If all parameters seem correct, that probably means that you are not using the latest iota2 version. Ensure that the .condarc file is correctly filled, and try to re-install iota2. In last case, open a issue with the chain version, the .condarc contents and the warning message.