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From kazukin6 <coolwh...@mail.ru>
Subject tomcat6, bottleneck, concurrent requests, windows xp
Date Sun, 14 Dec 2008 02:15:33 GMT


---------------------
1) there is maxThreads=100 in context.xml 
2) sending 100 simultaneous requests to one servlet, for example ab.exe -n
100 -c 100 {address}
3) in the servlet's own log for performance it shows around only 200-500 ms
per request
4) in the  ab.exe log it shows around 7 seconds(!) per request
---------------------

So the question is- is it a some sort of socket level bottleneck?
In JProfiler there is no thread locks shown.
How to resolve it?

====================================================
full log of ab.exe is
====================================================
Concurrency Level:      100
Time taken for tests:   16.656 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      2770200 bytes
HTML transferred:       2742700 bytes
Requests per second:    6.00 [#/sec] (mean)
Time per request:       16656.250 [ms] (mean)
Time per request:       166.563 [ms] (mean, across all concurrent requests)
Transfer rate:          162.42 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       31  146 208.0    109    1922
Processing:  1328 8015 4329.2   7797   16250
Waiting:      578 7109 4323.0   6734   15281
Total:       1438 8161 4350.1   7875   16281

Percentage of the requests served within a certain time (ms)
  50%   7875
  66%   9969
  75%  10969
  80%  11609
  90%  15547
  95%  16141
  98%  16219
  99%  16281
 100%  16281 (longest request)
-- 
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