[cups.bugs] [LOW] STR #1405: High CPU Usage cupsd 1.2svn r4964

[Gerd Bavendiek]

[STR New]

Hi all,

hope I'm addressing this to the right forum. I would like to configure two
nodes as CUPS servers with identical configuration, esp. printers.conf. A
third node named polly shall use these two nodes using

BrowsePoll antwerpen:631
BrowsePoll bruessel:631

in it's cupsd.conf. This works so far (did not as long as I used 1.1.20
BTW). lpstat shows 549 printers.

Unfortunately cupsd takes quite a lot of CPU time (only on the third node,
the one with hopefully zero administration and a 0 byte printers.conf.
cupsd both on antwerpen and bruessel takes only very little CPU).

cupsd on polly typically uses 25 % of a Pentium III @ 1 GHZ. In less than
24 h I have:
polly:/root>>> ps -ef | grep cups
root     21474 21473  0 Jan24 ?        00:00:21 cups-polld antwerpen 631
120 631
root     21475 21473  0 Jan24 ?        00:00:21 cups-polld bruessel 631
120 631
lp       21473     1 25 Jan24 ?        04:08:10 /usr/sbin/cupsd

stracing the process I can see that after getting data from antwerpen or
bruessel via select / recvfrom cupsd always opens /etc/services and reads
this file completely (it's 583K). Running strace -c for a second or two
gives:

polly:/root>>> cat qqq2
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 92.08    0.314693          12     25742           read
  1.50    0.005126          27       192           select
  1.21    0.004126          24       175           open
  1.18    0.004036          23       175           munmap
  0.96    0.003283           6       560           time
  0.82    0.002812          16       175           recvfrom
  0.70    0.002381          14       175           mmap2
  0.61    0.002073           6       350           fcntl64
  0.56    0.001908          11       175           close
  0.38    0.001305           7       175           fstat64
------ ----------- ----------- --------- --------- ----------------
100.00    0.341743                 27894           total

Is there anything I can configure to reduce the cupsd load on polly ?

Any hints really appreciated !

Kind regards

Gerd

P.S.: BrowseInterval 120

lulu:/home/bav> tar vtf polly-cups.tar 
-rw-r----- bav/bav        6439 2006-01-24 17:30:47 cupsd.conf
-rw-r--r-- bav/bav      308582 2006-01-25 14:31:41 error_log

Link: http://www.cups.org/str.php?L1405
Version: 1.2-current
Attachment: http://www.cups.org/strfiles/1405/polly-cups.tar