Parallel cout is very sluggish when displaying the progress percentage

After git pulling the newest Darwin&Core repositories, using parallel to run command is very slow when cout the progress percentage.

The process runs smoothly at the beginning, but becomes very sluggish in the latter 50%. The completion time of the process cannot be output immediately; sometimes it takes several minutes to display the previously completed information. When checking the process in htop, it quickly enters the sleep state. It works fine without using parallel.

added typesoftware label

changed the description

I am working on own server, and I can ensure that the issue is not caused by the server’s performance.

changed title from Cout is very sluggish when displaying the progress percentage to Parallel cout is very sluggish when displaying the progress percentage

Likely Proto/Darwin!102 (merged). First guess is we need a = instead of a += at https://gitlab.cern.ch/Proto/Darwin/-/blob/master/scripts/parallel.py#L65

Note: this issue should have been opened in https://gitlab.cern.ch/Proto/Darwin

mentioned in merge request Proto/Darwin!105 (merged)

mentioned in commit Proto/Darwin@137139cf

closed with merge request Proto/Darwin!105 (merged)