https://bz.apache.org/bugzilla/show_bug.cgi?id=65626
Bug ID: 65626
Summary: MPM Event doesn't shutdown idle children after working
under high load
Product: Apache httpd-2
Version: 2.4.37
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: mpm_event
Assignee: bugs@httpd.apache.org
Reporter: gregvoro...@gmail.com
Target Milestone: ---
After running ab with concurrency equal or more than MaxRequestWorkers for some
time, apache doesn't kill idle processes any longer. Following is logged every
second:
[Mon Oct 11 15:17:29.416964 2021] [mpm_event:trace5] [pid 71:tid
140381265582400] event.c(2834): Not shutting down child: total daemons 16 /
active limit 16 / ServerLimit 16
server-status (W busy worker is for server-status itself, no any other
requests):
BusyWorkers: 1
IdleWorkers: 1023
Processes: 16
Stopping: 0
BusyWorkers: 1
IdleWorkers: 1023
ConnsTotal: 0
ConnsAsyncWriting: 0
ConnsAsyncKeepAlive: 0
ConnsAsyncClosing: 0
Scoreboard:
________________________________________________________________________________________________________________________________________________________________________________W_______________________________________________________________________________________________________________________________________________________________
MPM conf:
<IfModule mpm_event_module>
StartServers 2
ServerLimit 16
ThreadsPerChild 64
MaxRequestWorkers 1024
MinSpareThreads 32
MaxSpareThreads 96
</IfModule>
ApacheBenchmark command requesting 700kb static file:
$ ab -n 10000 -k -c 1100
I can reproduce it after every run of ab with -c more than MaxRequestWorkers.
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