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worker_processes vs worker_connections (and keepalive)

Posted by Rad 
worker_processes vs worker_connections (and keepalive)
June 20, 2012 02:28AM
Добрый день,
Математика проста и очевидна, однозначных ответов на форуме и в интернете не нашел. Хочу попросить совета, имеем связку nginx+php-fpm+memcached:

- Linux hostname 2.6.32-220.13.1.el6.x86_64 #1 SMP Tue Apr 17 15:16:22 CDT 2012 x86_64 x86_64 x86_64 GNU/Linux

- $ cat /proc/cpuinfo |grep process| wc -l

- $ cat /proc/meminfo
MemTotal: 16400716 kB
MemFree: 7201000 kB

- $ nginx -V
nginx version: nginx/1.2.1
built by gcc 4.4.4 20100726 (Red Hat 4.4.4-13) (GCC)
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx/ --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_stub_status_module --with-mail --with-mail_ssl_module --with-file-aio --with-ipv6 --with-cc-opt='-O2 -g'

- $ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 126954
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 1024
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

1) Однако, что лучше увеличивать worker_processes или worker_connections?
В среднем сейчас до 5K соединений, но со временем идет рост.

2) Как подобрать оптимальное значение keepalive для memcached (memcached -d -p 11211 -u memcached -m 2048 -c 1024)
upstream memcached_backend {
keepalive 32;

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