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?
OS : Red Hat Enterprise Linux Server
MPM: worker
httpd.conf:
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Listen 80
Listen 8080
ServerLimit 50
StartServers 5
MinSpareThreads 5
MaxSpareThreads 10
ThreadsPerChild 1
MaxRequestWorkers 50
MaxConnectionsPerChild 0
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compile settings:
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# /opt/apache24/bin/httpd -V
Server version: Apache/2.4.46 (Unix)
Server built: Jan 15 2021 15:05:18
Server's Module Magic Number: 20120211:93
Server loaded: APR 1.7.0, APR-UTIL 1.6.1
Compiled using: APR 1.7.0, APR-UTIL 1.6.1
Architecture: 64-bit
Server MPM: worker
threaded: yes (fixed thread count)
forked: yes (variable process count)
Server compiled with....
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
-D APR_USE_PROC_PTHREAD_SERIALIZE
-D APR_USE_PTHREAD_SERIALIZE
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=256
-D HTTPD_ROOT="/opt/apache24"
-D SUEXEC_BIN="/opt/apache24/bin/suexec"
-D DEFAULT_PIDLOG="logs/httpd.pid"
-D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="conf/mime.types"
-D SERVER_CONFIG_FILE="conf/httpd.conf"
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