Bug 907451

I have just discovered that if you browse to a valid ppd file via the "Driver Packages" button this seems to "unstick" the system and it then lists all drivers, not just the one you specified, and continues to work for other printers too.

It needs several seconds when the search string is e.g. "hp"
where very many drivers are available for this manufacturer.

It may need a really long time (several minutes) when no search string
is specified (i.e. to list all drivers for "any model").
 
While it is running "top" shows a "y2base" command that
uses 99% CPU all the time.

The root cause is a slow implementation in YaST core
how it deals with long lists when many elements are added
one after the other to a long list. It becomes slower and slower
the longer the list becomes (because of a "deep copy" inside).

As a workaround for now to speed it up you need to provide
a search string that does not result a very long list of drivers.

For example in the connection wizard select as manufacturer "Generic"
to get a fist list of drivers relatively quickly and then change the
search string from "generic" to one that is relatively specific
for your particular model for example "hp 4000" when you
have a "HP LaserJet 4000".

It is fixed in yast2-printer for SLE12
that is not in openSUSE 13.2.

Therefore it is a duplicate of bug#902680
	
Tim Nicholson,

yast2-printer for SLE12 is avaialble in the openSUSE build service
development project "Printing" also for openSUSE 13.2 x86_64 from
http://download.opensuse.org/repositories/Printing/openSUSE_13.2/x86_64/

After I did on my openSUSE 13.2 x86_64 machine:
------------------------------------------------------------------------------
# wget http://download.opensuse.org/repositories/Printing/openSUSE_13.2/x86_64/yast2-printer-3.1.1-1.4.x86_64.rpm

# rpm -Uhv --force yast2-printer-3.1.1-1.4.x86_64.rpm
------------------------------------------------------------------------------
it shows long lists of drivers sufficiently fast again.

Note that yast2-printer for SLE12 has some special adaptions
for CUPS 1.7 (and cups-browsed) but I tried to implement them
in a backward compatible way so that yast2-printer for SLE12
should still work also for CUPS 1.5.4 in openSUSE 13.2.

*** This bug has been marked as a duplicate of bug 902680 ***

Curious, as my initial search string was the specific printer type!
I was working in a vm so could cut and past from another instance.

Normally when it is searching there is a pop up showing its busy. What I got was the pop up for a moment, and then it went away suggesting the search had finished with no result.

I also noticed that in your attachment#615220 [details]
there is neither the
"Determining matching printer drivers..."
popup nor the subsequent optional
"Processing many printer drivers. Please wait..."
popup (the latter is shown if the list of driver items
is greater than 500 entries)
because I always have them when listing many drivers.

If you are interested:
The source code for it is the
  DriverItems(driver_filter_string, preselection)
function in /usr/share/YaST2/modules/Printer.rb

Tim Nicholson,
does it work o.k. for you with yast2-printer from the "Printing" project?

Tim Nicholson,
if you have the /var/log/YaST2/y2log or /var/log/YaST2/y2log-*.gz file
from the time when you got the pop up for a moment and then it went away,
please attach it so that I can have a look what went on on your
machine at that time.

Created attachment 615379 [details]
yast log covering printer operations