> In the following environment where multiple Listen directives are defined, the number of child processes may temporarily
> fall below MinSpareThreads after 6 requests are received at the same time and HTTP request processing is completed.
> Is this a bug or a specification?
The process status is shown in the output of the following command.
# pstree -p `cat /opt/apache24/logs/httpd.pid`
In (3), all child processes have been terminated and new child processes have been created.
Isn't it a bug that all child processes are temporarily terminated?
If it's not a bug, please tell me why.
(1) It is in the state where httpd is started.
----------------------------------------------
Tue Mar 16 13:38:09 JST 2021
httpd(4035)-+-httpd(4036)-+-{httpd}(4046)
| `-{httpd}(4047)
|-httpd(4037)-+-{httpd}(4048)
| `-{httpd}(4049)
|-httpd(4038)-+-{httpd}(4050)
| `-{httpd}(4051)
|-httpd(4039)-+-{httpd}(4052)
| `-{httpd}(4053)
`-httpd(4040)-+-{httpd}(4054)
`-{httpd}(4055)
----------------------------------------------
(2) 6 requests are being processed.
----------------------------------------------
Tue Mar 16 13:38:26 JST 2021
httpd(4035)-+-httpd(4036)-+-{httpd}(4046)
| `-{httpd}(4047)
|-httpd(4037)-+-{httpd}(4048)
| `-{httpd}(4049)
|-httpd(4038)-+-{httpd}(4050)
| `-{httpd}(4051)
|-httpd(4039)-+-{httpd}(4052)
| `-{httpd}(4053)
|-httpd(4040)-+-{httpd}(4054)
| `-{httpd}(4055)
|-httpd(4101)-+-{httpd}(4103)
| `-{httpd}(4104)
|-httpd(4109)-+-{httpd}(4113)
| `-{httpd}(4114)
|-httpd(4110)-+-{httpd}(4115)
| `-{httpd}(4116)
|-httpd(4121)-+-{httpd}(4133)
| `-{httpd}(4134)
|-httpd(4122)-+-{httpd}(4135)
| `-{httpd}(4136)
|-httpd(4123)-+-{httpd}(4129)
| `-{httpd}(4130)
`-httpd(4124)-+-{httpd}(4131)
`-{httpd}(4132)
----------------------------------------------
(3) The following is the state transition after the request processing is completed.
----------------------------------------------
Tue Mar 16 13:38:38 JST 2021
httpd(4035)-+-httpd(4036)
|-httpd(4037)
|-httpd(4038)
|-httpd(4039)
|-httpd(4040)
|-httpd(4101)
|-httpd(4110)
|-httpd(4121)
|-httpd(4122)
|-httpd(4123)
`-httpd(4124)
----------------------------------------------
Tue Mar 16 13:38:39 JST 2021
httpd(4035)---httpd(4213)-+-{httpd}(4215)
`-{httpd}(4216)
----------------------------------------------
Tue Mar 16 13:38:40 JST 2021
httpd(4035)-+-httpd(4213)-+-{httpd}(4215)
| `-{httpd}(4216)
|-httpd(4221)-+-{httpd}(4225)
| `-{httpd}(4226)
`-httpd(4222)-+-{httpd}(4227)
`-{httpd}(4228)
----------------------------------------------
Tue Mar 16 13:38:41 JST 2021
httpd(4035)-+-httpd(4213)-+-{httpd}(4215)
| `-{httpd}(4216)
|-httpd(4221)-+-{httpd}(4225)
| `-{httpd}(4226)
|-httpd(4222)-+-{httpd}(4227)
| `-{httpd}(4228)
|-httpd(4233)-+-{httpd}(4245)
| `-{httpd}(4246)
|-httpd(4234)-+-{httpd}(4247)
| `-{httpd}(4248)
|-httpd(4235)-+-{httpd}(4241)
| `-{httpd}(4242)
`-httpd(4236)-+-{httpd}(4243)
`-{httpd}(4244)
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