What is the log_level that you have set in your program ? If you haven’t, you could do something like
set_log_level(50)
or
set_log_active(False)
Of course this assume that you have imported dolfin using the wildcards
from dolfin import *
Generally, the lower the log_level the more verbose log you see in the output. You could experiment with different levels to see what suits you the best in case if you do not want to completely turn it off.