[cups-devel] [UNKN] STR #4511: FR: Improve threading support when serving Linux clients

[Alex Korobkin]

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[STR New]

I have a 24 CPU Linux server that serves ~700 printers and ~10000 CUPS
clients. cupsd process is occupying 100% of a single CPU, and not making
any use of other cores. It is good for filters that can run faster, but bad
for regular requests (lots of clients do Get-Printers all the time, get
slow response). 

Would be nice if cupsd could use threads more effectively.

This is with CUPS 1.7.5. 

$ pidstat -t -p 15708 1
Linux 3.13.0-37-generic (printserver1) 	10/28/2014 	_x86_64_	(24 CPU)

03:25:18 PM      TGID       TID    %usr %system  %guest    %CPU   CPU 
Command
03:25:19 PM     15708         -   89.00   10.00    0.00   99.00    16 
cupsd
03:25:19 PM         -     15708   89.00   10.00    0.00   99.00    16 
|__cupsd

Link: https://www.cups.org/str.php?L4511
Version: 1.7.5
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