hhvm vs. php5-fpm

01) Notes

(YES, THIS IS GOOFY AND NAIVE AND SO ON.)

Software:
- Ubuntu 14.04.2 LTS
- nginx 1.4.6
- hhvm 2.5.1
- php5-fpm 5.5.9 (pm.max_children = 30)
- WordPress 4.4.1 (fresh install, so very little data)

Hardware:
- Laughable HP ProLiant MicroServer (dual core 800MHz Athlon)

Methodology:
- siege was giving me grief, so I used ab. I know, I know.
- Tests were run from a VM running on a different physical machine.
- Both HHVM and php-fpm were set up in UNIX socket mode.
- Same WordPress install, with WP_HOME and WP_SITEURL munged.
- The only difference in the responses was the port in computed URLs.

jdub@ubuntu:~$ curl --silent http://10.11.0.2:81/ | wc
    125     433    7071
jdub@ubuntu:~$ curl --silent http://10.11.0.2:82/ | wc
    125     433    7071

02) hhvm 2.5.1

Server Software:        nginx/1.4.6
Server Hostname:        10.11.0.2
Server Port:            81

Document Path:          /
Document Length:        7071 bytes

Concurrency Level:      10
Time taken for tests:   30.000 seconds
Complete requests:      2303
Failed requests:        0
Total transferred:      16779658 bytes
HTML transferred:       16284513 bytes
Requests per second:    76.77 [#/sec] (mean)
Time per request:       130.266 [ms] (mean)
Time per request:       13.027 [ms] (mean, across all concurrent requests)
Transfer rate:          546.21 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.1      0       3
Processing:    48  129  18.8    131     177
Waiting:       48  128  18.5    130     175
Total:         49  130  18.8    132     177

Percentage of the requests served within a certain time (ms)
  50%    132
  66%    140
  75%    144
  80%    147
  90%    153
  95%    158
  98%    164
  99%    166
 100%    177 (longest request)

03) php5-fpm 5.5.9

Server Software:        nginx/1.4.6
Server Hostname:        10.11.0.2
Server Port:            82

Document Path:          /
Document Length:        7071 bytes

Concurrency Level:      10
Time taken for tests:   30.051 seconds
Complete requests:      801
Failed requests:        0
Total transferred:      5844096 bytes
HTML transferred:       5663871 bytes
Requests per second:    26.65 [#/sec] (mean)
Time per request:       375.170 [ms] (mean)
Time per request:       37.517 [ms] (mean, across all concurrent requests)
Transfer rate:          189.91 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.2      0       4
Processing:    76  372  63.0    373     538
Waiting:       75  366  60.9    366     535
Total:         76  372  63.0    373     539

Percentage of the requests served within a certain time (ms)
  50%    373
  66%    390
  75%    420
  80%    436
  90%    457
  95%    470
  98%    482
  99%    486
 100%    539 (longest request)

04) nginx.conf

upstream hhvm {
        server unix:/var/run/hhvm/sock;
}

server {
        listen 81 default_server;
        listen [::]:81 default_server ipv6only=on;

        root /srv/wordpress/wordpress;
        index index.php index.html;

        location / {
                try_files $uri $uri/ /index.php;
        }

        location ~ \.php$ {
                include fastcgi_params;
                fastcgi_pass hhvm;
                fastcgi_max_temp_file_size 0;
        }
}

upstream fpm {
        server unix:/var/run/php5-fpm.sock;
}

server {
        listen 82 default_server;
        listen [::]:82 default_server ipv6only=on;

        root /srv/wordpress/wordpress;
        index index.php index.html;

        location / {
                try_files $uri $uri/ /index.php;
        }

        location ~ \.php$ {
                include fastcgi_params;
                fastcgi_pass fpm;
                fastcgi_max_temp_file_size 0;
        }
}