Sorry for the late reply, I had some other more urgent tasks to do. I have looked into your log.
foomatic-rip was running for 5 seconds (09:09:52 - 09:09:57) and it ran this time due to the Ghostscript process it called and which by itself ran at least 4 seconds. This does not look for a very long time and if you think this is for the document which you had sent, it is a problem of Ghostscript. As foomatic-rip calls the pdftops filter of cups-filters and then pdftops calls Ghostscript for actually converting the incoming PDF to PostScript, you can let pdftops use Poppler instead of Ghostscript for this task to see whether Poppler processes the job more quickly. To switch pdftops to Poppler, use the "pdftops-renderer=pdftops" option (see README of cups-filters, /usr/share/doc/cups-filters/README.gz). If with Poppler your jobs go more quickly, report a bug on www.ghostscript.com, supplying a sample input file and the Ghostscript command line (you find it in CUPS' error_log). Before doing this please also try to run the Ghostscript command line directly on the input file from a terminal window, to check whether Ghostscript was really that slow. Also printing very many and/or big jobs in a row and observing the output of the "top" command could help. If the problem is not the slowness of Ghostscript but the "Removing document files." task afterwards taking a full minute (does this make the next job wait that minute?) report a bug on www.cups.org. Note that this delay is not caused by Ghostscript or foomatic-rip as these processes had already ended before. -- You received this bug notification because you are a member of Ubuntu Touch seeded 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/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
