Control: tag -1 more info Could you join the PDF? Le 6 juin 2013 22:09, "Dominique Brazziel" <dbrazz...@snet.net> a écrit :
> I have been hit extremely hard by this bug for about a month > or two now, but it certainly wasn't present in the past. On my > system the GUI completely freezes, the clock on the top panel stops > on the second after CUPS/Ghostscript/hpcups start doing their thing, > and all mouse and keyboard events are ignored. Remote ssh sessions > become are unresponsive as well, so monitoring the system (htop, top, > etc.) is not possible. The hang lasts for anywhere from 5 to 20 minutes > for just a 3 page pdf. > > I suspected high disk usage and review of the sysstat logs > (sar -d -p) confirmed extremely large average disk queue sizes, on the > order of 2000-6000 and sometimes higher. Review of kernel logs shows > the kernel hung task process being executed as tasks have been > unresponsive for more than 2 minutes. > > One helpful tracker of what is happening is the atop monitor > which dumps data to it's log at 10 minute intervals. By going > through chronologically until the interval in which the print > job was active I was able to see average disk queues leading up > to the time the job was active and the interval the job was active. > The default display shows kswapd occupying 16% of the CPU and > dozens of processes in uninterruptable sleep state (D). gs was not > running at this point, but by changing the display to show memory usage, > I see virtual and real memory growth and size of 150M and 116M > respectively. The iceweasel (firefox) process with ~15 tabs open > has virtual memory size of 1 gig but about 55M of real memory > and shrinking, as are the 8 to 10 chromium processes. > > I think there is a problem with kswapd on this kernel > (V3.8.2-686-PAE), and I have a relatively small system (1 gig RAM), > but 116 megs of real memory seems like a lot to print a small > html/text document and Fedora (17, 18) on the same hardware platform > (Intel Atom N270 w/1 gig of RAM) doesn't experience this extreme > stress or hang. > > I will check the version of ghostscript on Fedora and try and > recreate the problem with a similar memory load (i.e. firefox and > many chromium processes) and see what happens. > > > -- > To UNSUBSCRIBE, email to debian-printing-requ...@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact > listmas...@lists.debian.org > Archive: http://lists.debian.org/1370549104.11049.23.ca...@asusb202.mba > >
