[Systems] Benchmarking aslo-proxy

[Bernie Innocenti]

I tried to measure the overhead of these 3 scenarios:

1) aslo-proxy.sugarlabs.org: 9.94 reqs/sec
2) activities.sugarlabs.org: 9.83 reqs/sec
3) aslo-web.sugarlabs.org:   1.90 reqs/sec

I've performed all three tests from the machine hosting the service to
ensure no network overhead. The overhead of ab itself is negligible with
with so few connections per second.

There's definitely something wrong with aslo-web's configuration. I'd
expect it to perform approximately as well as sunjammer, because the CPU
speeds are equivalent. Is APC installed?

Note that proxying a PHP application with Squid generally does not buy
anything, because all static files are already being served by Apache
directly, which in turn uses mod_mem_cache.

We may also add kludgy rules to cache the most frequently accessed pages
for a few minutes (Wikipedia style), but this would also introduce
complexity and fragility so I'd rather delay such optimizations until
we'll run out of better options.

Now, the only purpose of going through Squid would be to balance traffic
to multiple applications servers. Of which, we only have one at this
time.

Do we want to keep the aslo instance on sunjammer in production
alongside the new one until we get a new machine?

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130!aslo-proxy:~# ab  -n 1000 -c 4 http://aslo-proxy.sugarlabs.org/en-US/sugar/
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 aslo-proxy.sugarlabs.org (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:        Apache/2.2.11
Server Hostname:        aslo-proxy.sugarlabs.org
Server Port:            80

Document Path:          /en-US/sugar/
Document Length:        38132 bytes

Concurrency Level:      4
Time taken for tests:   100.580 seconds
Complete requests:      1000
Failed requests:        762
   (Connect: 0, Receive: 0, Length: 762, Exceptions: 0)
Write errors:           0
Total transferred:      38528786 bytes
HTML transferred:       38062786 bytes
Requests per second:    9.94 [#/sec] (mean)
Time per request:       402.322 [ms] (mean)
Time per request:       100.580 [ms] (mean, across all concurrent requests)
Transfer rate:          374.09 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   1.5      0      46
Processing:   180  402 183.0    380    2782
Waiting:      160  372 175.5    349    2668
Total:        180  402 183.0    380    2782

Percentage of the requests served within a certain time (ms)
  50%    380
  66%    417
  75%    442
  80%    464
  90%    520
  95%    585
  98%    670
  99%    929
 100%   2782 (longest request)


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130!sunjammer:~# ab  -n 1000 -c 4 http://activities.sugarlabs.org/en-US/sugar/
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 activities.sugarlabs.org (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:        Apache/2.2.11
Server Hostname:        activities.sugarlabs.org
Server Port:            80

Document Path:          /en-US/sugar/
Document Length:        37935 bytes

Concurrency Level:      4
Time taken for tests:   101.718 seconds
Complete requests:      1000
Failed requests:        996
   (Connect: 0, Receive: 0, Length: 996, Exceptions: 0)
Write errors:           0
Total transferred:      38487710 bytes
HTML transferred:       38132710 bytes
Requests per second:    9.83 [#/sec] (mean)
Time per request:       406.873 [ms] (mean)
Time per request:       101.718 [ms] (mean, across all concurrent requests)
Transfer rate:          369.51 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.6      0      13
Processing:   172  406 134.7    383    1642
Waiting:      150  385 126.2    366    1496
Total:        172  407 134.7    383    1642

Percentage of the requests served within a certain time (ms)
  50%    383
  66%    423
  75%    457
  80%    473
  90%    531
  95%    585
  98%    691
  99%    838
 100%   1642 (longest request)
sunjammer:~# 


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bernie at aslo-web:~$ ab  -n 1000 -c 4 http://aslo-web.sugarlabs.org/en-US/sugar/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 aslo-web.sugarlabs.org (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:        Apache/2.2.12
Server Hostname:        aslo-web.sugarlabs.org
Server Port:            80

Document Path:          /en-US/sugar/
Document Length:        38421 bytes

Concurrency Level:      4
Time taken for tests:   527.102 seconds
Complete requests:      1000
Failed requests:        999
   (Connect: 0, Receive: 0, Length: 999, Exceptions: 0)
Write errors:           0
Total transferred:      38382416 bytes
HTML transferred:       38150416 bytes
Requests per second:    1.90 [#/sec] (mean)
Time per request:       2108.409 [ms] (mean)
Time per request:       527.102 [ms] (mean, across all concurrent requests)
Transfer rate:          71.11 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.6      0      19
Processing:  1264 2105 320.1   2074    3818
Waiting:     1239 2077 316.8   2051    3784
Total:       1264 2105 320.1   2074    3818

Percentage of the requests served within a certain time (ms)
  50%   2074
  66%   2202
  75%   2300
  80%   2350
  90%   2491
  95%   2641
  98%   2885
  99%   3126
 100%   3818 (longest request)

-- 
   // Bernie Innocenti - http://codewiz.org/
 \X/  Sugar Labs       - http://sugarlabs.org/