Хоствам Rails приложение на мощна машина, която - мисля - трябва да може да се справи с много по-голямо натоварване, отколкото й давам. Ето неблагоприятните резултати от тестовете на ApacheBench:
ab -kc 250 -n 1000 -H "Accept-Encoding: gzip,deflate" https://www.mysite.com/
Server Software: nginx/1.0.15
Server Hostname: www.mysite.com
Server Port: 443
SSL/TLS Protocol: TLSv1/SSLv3,DHE-RSA-AES256-SHA,2048,256
Document Path: /
Document Length: 4258 bytes
Concurrency Level: 250
Time taken for tests: 16.498 seconds
Complete requests: 1000
HTML transferred: 4258000 bytes
Requests per second: 60.61 [#/sec] (mean)
Time per request: 4124.432 [ms] (mean)
Time per request: 16.498 [ms] (mean, across all concurrent requests)
Transfer rate: 282.83 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 302 1801 866.3 1623 3583
Processing: 183 1993 867.9 1873 7050
Waiting: 183 1880 864.2 1743 7036
Total: 1397 3794 1389.0 3558 10580
Percentage of the requests served within a certain time (ms)
50% 3558
66% 4012
75% 4179
80% 4712
90% 4947
95% 6411
98% 8376
99% 8380
100% 10580 (longest request)
Гадост. Може би греша, но чувствам, че трябва да мога да получа много повече от 60 заявки в секунда и много по-малко време за заявка от 4,1 секунди.
Приложението се намира на c1.xlarge EC2 екземпляр (7 GB памет, 20 EC2 изчислителни единици, 8 виртуални ядра с 2,5 EC2 изчислителни единици всяко, 1690 GB място за съхранение на екземпляри, 64-битова платформа, I/O Performance: висока). Коренът на сайта, срещу който се изпълни бенчмаркът на ApacheBench, се кешира за действие и дори не докосва базата данни. Една заявка към него изглежда така:
Started GET "/" for ##.###.###.## at Thu Apr 19 13:05:50 +0000 2012
Processing by OneOfMyControllers#index as HTML
Read fragment views/www.mysite.com/index (1.1ms)
Completed 200 OK in 2ms
Машината работи с Ubuntu 11.04, а аз използвам Rails 3.1, Ruby Enterprise Edition, Passenger и nginx. Моята конфигурация на nginx изглежда така:
worker_processes 8;
worker_rlimit_nofile 65535;
events {
worker_connections 4096;
}
http {
passenger_root /usr/lib/ruby/gems/1.8/gems/passenger-3.0.8;
passenger_ruby /usr/bin/ruby1.8;
rails_spawn_method smart;
rails_app_spawner_idle_time 0;
rails_framework_spawner_idle_time 0;
passenger_max_pool_size 60;
passenger_pool_idle_time 1000;
ssl_session_cache shared:SSL:3m; # 3MB can hold about 12k SSL cache sessions
ssl_session_timeout 5m; # average user spends 5 minutes on our site
include mime.types;
default_type application/octet-stream;
sendfile on;
tcp_nopush on; # useful with the sendfile option
tcp_nodelay off;
keepalive_timeout 10;
send_timeout 10;
client_body_timeout 10;
client_header_timeout 10;
gzip on;
gzip_static on;
gzip_disable "MSIE [1-6]\.";
gzip_comp_level 4;
gzip_buffers 16 4k;
gzip_min_length 1000;
gzip_proxied any;
gzip_vary on;
gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
gzip_http_version 1.0; # Amazon CloudFront uses HTTP/1.0
include /opt/nginx/conf/sites-enabled/*;
}
И вътре в /opt/nginx/conf/sites-enabled/mysite.com имам:
server {
listen 80;
server_name mysite.com;
rewrite ^/(.*) http://www.mysite.com/$1 permanent;
}
server {
listen 443;
ssl on;
server_name mysite.com;
ssl_certificate /opt/mysite/ssl/wildcard_gandi_2012/combined-certification.crt;
ssl_certificate_key /opt/mysite/ssl/wildcard_gandi_2012/monserveur.key;
ssl_protocols SSLv3 TLSv1;
ssl_ciphers HIGH:!ADH:!MD5;
ssl_prefer_server_ciphers on;
rewrite ^/(.*) https://www.mysite.com/$1 permanent;
}
server {
listen 80;
server_name *.mysite.com www.mysite.com;
root /opt/mysite/public;
passenger_enabled on;
access_log /opt/mysite/log/nginx_access.log;
error_log /opt/mysite/log/nginx_error.log;
# Set the maximum file upload size to 25 MB.
client_max_body_size 25M;
}
server {
listen 443;
ssl on;
server_name *.mysite.com www.mysite.com;
ssl_certificate /opt/mysite/ssl/wildcard_gandi_2012/combined-certification.crt;
ssl_certificate_key /opt/mysite/ssl/wildcard_gandi_2012/monserveur.key;
ssl_protocols SSLv3 TLSv1;
ssl_ciphers HIGH:!ADH:!MD5;
ssl_prefer_server_ciphers on;
root /opt/mysite/public;
passenger_enabled on;
access_log /opt/mysite/log/nginx_access.log;
error_log /opt/mysite/log/nginx_error.log;
# Set the maximum file upload size to 25 MB.
client_max_body_size 25M;
# Asset caching
location ~ ^/(assets)/ {
root /opt/mysite/public;
gzip_static on;
access_log off;
expires 1y;
add_header Cache-Control public;
add_header Last-Modified "";
add_header ETag "";
break;
}
}
Някаква идея защо не мога да получа повече от 60 заявки/сек? Има ли нещо очевидно, което пропускам?