# httpd -V | grep MPM
Server MPM: prefork
CentOS provide 3 way modules, need to select only one.
- prefork => default
- worker
- event
Change prefork to worker
# vi /etc/httpd/conf.modules.d/00-mpm.conf
#LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
LoadModule mpm_worker_module modules/mod_mpm_worker.so
#vi /etc/httpd/conf.modules.d/10-php.conf
<IfModule prefork.c>
LoadModule php5_module modules/libphp5.so
</IfModule>
<IfModule worker.c>
LoadModule php5_module modules/libphp5-zts.so
</IfModule>
but this way needs php version install for worker... warning...
libphp5-zts.so may be nedded additional install
centos7 default package is for profork..