enterprise-support team mailing list archive

["Jay R. Wren" <jay.wren@xxxxxxxxxxxxx>]

Public bug reported:

$ apache2 -v
Server version: Apache/2.4.7 (Ubuntu)
Server built:   Jul 15 2016 15:34:04
$ cat /etc/os-release
NAME="Ubuntu"
VERSION="14.04.4 LTS, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04.4 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/";
SUPPORT_URL="http://help.ubuntu.com/";
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";

Configure apache like so:

<IfModule mpm_worker_module>
 StartServers 10
 MinSpareThreads 25
 MaxSpareThreads 750
 ThreadLimit 1000
 ThreadsPerChild 750
# MaxRequestWorkers aka MaxClients => ServerLimit *ThreadsPerChild
 MaxRequestWorkers 15000
 MaxConnectionsPerChild 0
 ServerLimit 20
 ThreadStackSize 524288
</IfModule>

Use a tool such as slowhttptest to keep lots of connections open:

$ slowhttptest -c 20000 -H -g -o my_header_stats-20k -i 10 -r 2000 -t
GET -u http://localhost/ -x 24 -p 3

Notice how the httpd processes only have 66 threads each:

$ ps -uwww-data -opid,ppid,nlwp | wc -l
  PID  PPID NLWP
  357 30954    9
  561 30954    4
  706 30954   22
 1057 30954   66
 1125 30954   66
 1126 30954   66
 1259 30954   66
 1326 30954   66
 1327 30954   66
 1461 30954   66
 1528 30954   66
 1529 30954   66
 1662 30954   66
 1729 30954   66

Now change to mpm_event with the same settings and do the test again:

$ ps -uwww-data -opid,ppid,nlwp
  PID  PPID NLWP
 3100  3097  752
 3102  3097  752
 3229  3097  752
 3448  3097  752
10650  3097  752


Expected behavior: worker should behave much like event as documented: http://httpd.apache.org/docs/current/mod/event.html http://httpd.apache.org/docs/current/mod/worker.html

** Affects: apache2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1628278

Title:
  mpm_worker has a limit of 64 ThreadsPerChild even if you configure it
  with a larger number

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