How to know which process the printing task comes from?

[xiong-xiao-yang]

I want to know which process the printing task is from based on its ID. Is there any technical solution that can be implemented?

[zdohnal]

The job object which represents the whole job is not under a separate process, however the scheduler spawns at least a communication backend to send the job to printer, and additionally filters. Their PIDs are visible in debug logs if they are enabled, so you can find them there. Otherwise we don't save PIDs for monitoring/history purposes, since IMO such information are helpful for debugging, so they are shown only in debugging output.