Dear Till, Thanks for your investigation of this problem. Below are the information we found maybe helpful for the investigation: As we said before:"The phenomenon that print jobs slower in 16.04 is more obvious when printing many jobs in the same time." We figure out that the interval time of one print job to the next print job is huge when print many jobs in the same time. And the error_log files shows that the step below takes time , this step is only exist in 16.04: "Expiring subscriptions..."
---------------- Attach file description: File 1: error_log.1-16.04-orca-rpdl-20181113_Job284_290: error_log of Job284 to Job 290 is the consecutive printing 7 jobs on 16.04 in the same time. File 2:error_log.2-14.04-orca-rpdl-20181114_Job327_332 : error_log of Job327 to Job 332 is the consecutive printing 7 jobs on 14.04 in the same time. ----------- By the way, we did the ghostscript investigation of you advice, but we didn't found it cause the slowdown problem. Best Regards, ** Attachment added: "LogConsecutivePrinting.zip" https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1801496/+attachment/5213036/+files/LogConsecutivePrinting.zip -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to cups in Ubuntu. https://bugs.launchpad.net/bugs/1801496 Title: Printing job in 16.04 is slower than in 14.04 Status in cups package in Ubuntu: Incomplete Bug description: Ubuntu 16.04LTS OS Version： 16.04.5 CUPS Version： 2.1.3 Ghostscript Version： 9.25 （2018-09-13） Printing job in 16.04 is slower than in 14.04 We(RICOH printer driver developer) are report a problem from our printer users: I print file Ubuntu 14.04.5, CUPS 2.1.3,Ghostscript 9.25 is fast(12 Seconds). But, after I update to Ubuntu 16.04, CUPS 2.1.3, Ghostscript 9.25, I print the same file with the same driver is slow(326 Seconds). I figure out that all the print jobs is much slower on Ubuntu 16.04. I view the "CUPS Error Log", it shows that there are three points which maybe the reasons that makes the print job slowly. FIRST: ---------------------------------------------------------------------------- By counting the time from "Starting renderer" to "renderer exited with status 0", we figure out that 16.04 spend more time than 14.04 on "renderer" process. So we assuming that："renderer" is one of the key process that makes the print job slowly. "Starting renderer with command: \"printf \'\\033%%-12345X@PJL JOB\\012\';printf \'@PJL SET DATAMODE=TWIN\\ ........ @PJL EOJ\\012\\033%%-12345X\'\"" ..... renderer exited with status 0" ---------------------------------------------------------------------------- SECOND: ============================================================================ On 16.04, a print job outputs lots of logs as below: "[Job xxx] Removing document files." This step(“Removing document files”)does not exsit on 14.04. ============================================================================ The phenomenon that print jobs slower in 16.04 is more obvious when printing many jobs in the same time. THIRD We tried drivers form other company(HP,Brother…), the printings also slow down in Ubuntu 16.04 than 14.04. Our question is: 1. Do you have any plan to improve the performance of printing on Ubuntu 16.04? 2. Do you have any workaround before this problems fixed? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1801496/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
