From: jlim@natsoft.com.my
Operating system: RH 7.2
PHP version: 4.1.1
PHP Bug Type: Session related
Bug description: Segmentation fault with "mm",PHP works fine with "files"
When stress testing my web server with
ab -n5000 -c10 <url>
after about 1000-1500 requests the child processes start to fail.
In my apache error_log I see many entries like the following:
[Fri Dec 28 19:50:06 2001] [notice] child pid 14215 exit signal
Segmentation fault (11)
If I repeat the "ab" test several times, eventually Apache will hang and I
have to restart the web server. Here are the results:
This is ApacheBench, Version 1.3
Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd,
http://www.zeustech.net/
Copyright (c) 1998-1999 The Apache Group, http://www.apache.org/
Benchmarking semut (be patient)...
Server Software: Apache/1.3.20
Server Hostname: semut
Server Port: 80
Document Path: /juris/case.php
fbba51299f
Document Length: 85383 bytes
Concurrency Level: 10
Time taken for tests: 1638.945 seconds
Complete requests: 5000
Failed requests: 3446
(Connect: 0, Length: 3446, Exceptions: 0)
Total transferred: 429091301 bytes
HTML transferred: 427029653 bytes
Requests per second: 3.05
Transfer rate: 261.81 kb/s received
Connnection Times (ms)
min avg max
Connect: 0 9 197
Processing: 1692 3263 11353
Total: 1692 3272 11550
When I switch from "mm" to "files" everything works fine. I have a
suspicion that the bug is related to the fact that I am running on an SMP
processor.
--
Edit bug report at: http://bugs.php.net/?id=14780&edit=1