Php-fpm requests eventually goes to queue !!

[shahzaib shahzaib]

Hello,

     We're using nginx + php-fpm. Please check the following configurations
in php-fpm and sysctl in order to handle large amount of php-fpm request,
but still 1000+ requests are getting into queue every 15min.

php-fpm.d/stats.conf

[stats]
listen = 127.0.0.1:9000
user = apache
group = apache
request_slowlog_timeout = 5s
slowlog = /var/log/php-fpm/stats-slow.log
listen.allowed_clients = 127.0.0.1
pm = dynamic
pm.max_children = 250
pm.start_servers = 40
pm.min_spare_servers = 20
pm.max_spare_servers = 40
pm.max_requests = 40000
listen.backlog = -1
request_terminate_timeout = 300s
rlimit_files = 13107200
rlimit_core = unlimited
env[HOSTNAME] = $HOSTNAME
env[TMP] = /tmp
env[TMPDIR] = /tmp
env[TEMP] = /tmp
pm.status_path = /status

The main config parameters of sysctl.conf :

vm.overcommit_memory = 1
fs.file-max = 7000000
net.ipv4.tcp_max_syn_backlog = 70000
net.core.netdev_max_backlog = 4096
net.core.somaxconn=65535
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_tw_reuse = 1

/etc/security/limits.conf
root soft nofile 700000
root hard nofile 700000


We've 72G of Ram and also writing on disk is 100+MB/s on Sas drives which
makes high io util% most of the time.

Any clue why requests are still getting into php-fpm  queue and max
children also reached errors occuring, even max_children are 250 * 40000. ??

Php-fpm status :

pool:                 stats
process manager:      dynamic
start time:           22/May/2014:12:17:39 +0500
start since:          1140
accepted conn:        228244
listen queue:         579
max listen queue:     1970
listen queue len:     65535
idle processes:       167
active processes:     9
total processes:      176
max active processes: 250
max children reached: 1



Regards.
Shahzaib
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