You know from the last post I got a VPS yesterday with 256MB ram.

Yesterday, I configured it with full LEMP (Linux + Nginx / EngineX + MySQL + PHP) stack and install drupal. Blogged some performance test here.

Today I thought do to some more experiments with the box. Actually wasn't happy with the total delivery speed of the webserver.

So thought to do something to speed it up. Along with the decision I went for hunting with the official PHP accelerator APC and varnish. Configured APC without any trouble but stuck with varnish. After doing some Google I cae to know that, varnish caches everything it gets even the error pages. I removed varnish after getting this information as it didn't sound good to me!

Anyway, only with APC I found a huge performance difference. Speed increased more than 5x. Here is the testing result before and after APC.

Before APC

ab -n 1000 -c 10 http://drup.ibabar.com/?q=node/1
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking drup.ibabar.com (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests

Server Software:        nginx/1.2.4
Server Hostname:        drup.ibabar.com
Server Port:            80

Document Path:          /?q=node/1
Document Length:        8197 bytes

Concurrency Level:      10
Time taken for tests:   118.693 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      8678000 bytes
HTML transferred:       8197000 bytes
Requests per second:    8.43 #/sec
Time per request:       1186.933 ms
Time per request:       118.693 ms
Transfer rate:          71.40 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       36   37   0.9     37      40
Processing:   220 1146 165.4   1115    1710
Waiting:      183 1097 164.9   1070    1673
Total:        257 1183 165.4   1153    1747

Percentage of the requests served within a certain time (ms)
  50%   1153
  66%   1249
  75%   1300
  80%   1340
  90%   1401
  95%   1455
  98%   1534
  99%   1593
 100%   1747 (longest request)

And after APC

ab -n 1000 -c 10 http://drup.ibabar.com/?q=node/1
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking drup.ibabar.com (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests

Server Software:        nginx/1.2.4
Server Hostname:        drup.ibabar.com
Server Port:            80

Document Path:          /?q=node/1
Document Length:        8197 bytes

Concurrency Level:      10
Time taken for tests:   21.896 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      8678000 bytes
HTML transferred:       8197000 bytes
Requests per second:    45.67 #/sec
Time per request:       218.957 ms
Time per request:       21.896 ms
Transfer rate:          387.04 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        9   10   1.2     10      22
Processing:    72  208  42.8    195     312
Waiting:       63  192  42.8    184     299
Total:         83  218  42.7    205     322

Percentage of the requests served within a certain time (ms)
  50%    205
  66%    210
  75%    221
  80%    276
  90%    288
  95%    291
  98%    294
  99%    296
 100%    322 (longest request)

You see, before APC it was handling only 8 requests per second and now the counting is 48. More than 5x. Request time also reduced, longest request was 322ms after APC, not bad huh! And you know everything is only on the 256mb box which I got only for 12 bucks for a year!

Now the final decision is may the be box be big or small, APC is a must.

Oh one more information, I am exploring a new control panel called Ajenti on the box and you know I am liking it. I will share my experience with Ajenti on next posts.

Till now tell me what do you think about PHP Accelerators for speeding up web servers? What's your preferable PHP Accelerators.