Ubuntu
cupsys package

  1. Bug #55656
  2. Comment #11

Comment 11 for bug 55656

Revision history for this message
Graham White (graham-dcs) wrote : Re: [Bug 55656] Re: [Bug 55656] Re: usb backend hogs cpu

I have been experimenting with setting the nice value of the runaway usb
process, and it seems to have good effects. There are basically 4
processes involved in cups printing with this processor: cupsd, gs-esp,
rastertogutenprint, and usb. It is the usb process which hogs the cpu.
If I set the nice value of the usb process to 10 (using the command
renice +10 -p<process id of usb process>
then the usb process gets less cpu than rastertogutenprint, and
everything goes much faster (on my print server,
which is admittedly old and slow, about an order of magnitude faster).
Not perfect, but I can print a file in an hour or so
which was taking over a day without the renicing.

So, whatever the usb process is doing when it's hogging the cpu,
it apparently doesn't need to do nearly so much of it.

Graham