apache benchmark mi daje cudne rezultate

[ivanhoe]

kucam:

ab -n 500 -c 50 http://192.168.167.2/test_memDB.php

znaci 500 zahteva sa konkurentnoscu 50, a dobijem:

Complete requests: 500
Failed requests: 502

???
Znaci od ukupno 500 reqesta je 502 failed ?

Pri tome kad probam pojedinacni pristup toj skripti ona je jako brza (<2ms) i ne prijavljuje nikakvu gresku, ali ab prijavljuje failures cak i sa vrlo malom konkurentnoscu, tipa -c 10

Jel ima neko ideju o cemu se radi, tj. gde gresim? Jel moze da bude problem u WiFi mrezi i ruteru, da se pokrene neka DoS zastita ?

Evo ga ceo output za gornji primer:

This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.167.2 (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Finished 500 requests


Server Software:        Apache/2.2.3
Server Hostname:        192.168.167.2
Server Port:            80

Document Path:          /test_memDB.php
Document Length:        319 bytes

Concurrency Level:      50
Time taken for tests:   0.853666 seconds
Complete requests:      500
Failed requests:        502
   (Connect: 0, Length: 502, Exceptions: 0)
Write errors:           0
Total transferred:      162641 bytes
HTML transferred:       64967 bytes
Requests per second:    585.71 [#/sec] (mean)
Time per request:       85.367 [ms] (mean)
Time per request:       1.707 [ms] (mean, across all concurrent requests)
Transfer rate:          185.08 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        1   10   6.0     10      34
Processing:     6   58  59.6     49     368
Waiting:        5   57  59.6     48     367
Total:         14   69  59.4     59     375

Percentage of the requests served within a certain time (ms)
  50%     59
  66%     69
  75%     74
  80%     78
  90%     86
  95%     98
  98%    370
  99%    373
 100%    375 (longest request)