Python mod_wsgi在压力下失效

我试着给我的服务器施加一点压力，结果发生了一些奇怪的事情。我正在使用mod_wsgi，并插入了基本脚本：

import socket

def application(environ, start_response):
    status = '200 OK'
    output = 'Hello World!'
    response_headers = [('Content-type', 'text/plain'),
                    ('Content-Length', str(len(output)))]
    start_response(status, response_headers)
    return [output]

我试着用简单的“尽我所能”来强调它：

奇怪的事情发生了——wget向我抛出报告服务器上的错误500

当我查看apache日志时，我发现了这一点

[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25] mod_wsgi (pid=23632): Target WSGI script '/home/tricky/www/run.py' cannot be loaded as Python module.
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25] mod_wsgi (pid=23632): Exception occurred processing WSGI script '/home/tricky/www/run.py'.
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25] Traceback (most recent call last):
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]   File "/home/tricky/www/run.py", line 1, in <module>
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]     import web
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]   File "/usr/local/lib/python2.7/site-packages/web.py-0.36-py2.7.egg/web/__init__.py", line 14, in <module>
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]     import utils, db, net, wsgi, http, webapi, httpserver, debugerror
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]   File "/usr/local/lib/python2.7/site-packages/web.py-0.36-py2.7.egg/web/wsgi.py", line 8, in <module>
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]     import http
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25] ImportError: No module named http

[Sat Mar 10 21:46:18 2012][error][client 95.49.81.25]mod_wsgi（pid=23632）：无法将目标wsgi脚本'/home/tricky/www/run.py'作为Python模块加载。
[Sat Mar 10 21:46:18 2012][error][client 95.49.81.25]mod_wsgi（pid=23632）：处理wsgi脚本'/home/tricky/www/run.py'时发生异常。
[2012年3月10日星期六21:46:18][error][client 95.49.81.25]回溯（最近一次通话）：
[Sat Mar 10 21:46:18 2012][error][client 95.49.81.25]文件“/home/tricky/www/run.py”，第1行，在
[Sat Mar 10 21:46:18 2012][error][client 95.49.81.25]导入web
[2012年3月10日星期六21:46:18][error][client 95.49.81.25]文件“/usr/local/lib/python2.7/site packages/web.py-0.36-py2.7.egg/web/_uinit_uuuuuuuuu.py”，第14行，in
[Sat Mar 10 21:46:18 2012][error][client 95.49.81.25]导入utils、db、net、wsgi、http、webapi、httpserver、debugerror
[Sat Mar 10 21:46:18 2012][error][client 95.49.81.25]文件“/usr/local/lib/python2.7/site packages/web.py-0.36-py2.7.egg/web/wsgi.py”，第8行
[Sat Mar 10 21:46:18 2012][error][client 95.49.81.25]导入http
[Sat Mar 10 21:46:18 2012][error][client 95.49.81.25]导入错误：没有名为http的模块

---

这怎么可能？为什么会这样呢？

好吧，我找到了解决方案——apache2在弄乱了它的配置之后，出现了一些奇怪的种族状态。

服务apache2重新启动后

一切恢复正常：）

错误表明wswgi脚本导入web，web模块依赖于http模块，而http模块在系统中找不到，并且在“正常”负载下不会发生这种情况？棘手的部分是，在正常负载下，一切正常……如果您自己找到了解决方案，请将其作为答案发布并接受。哦，您是对的@webjunkie:）完成了：D

[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25] mod_wsgi (pid=23632): Target WSGI script '/home/tricky/www/run.py' cannot be loaded as Python module.
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25] mod_wsgi (pid=23632): Exception occurred processing WSGI script '/home/tricky/www/run.py'.
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25] Traceback (most recent call last):
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]   File "/home/tricky/www/run.py", line 1, in <module>
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]     import web
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]   File "/usr/local/lib/python2.7/site-packages/web.py-0.36-py2.7.egg/web/__init__.py", line 14, in <module>
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]     import utils, db, net, wsgi, http, webapi, httpserver, debugerror
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]   File "/usr/local/lib/python2.7/site-packages/web.py-0.36-py2.7.egg/web/wsgi.py", line 8, in <module>
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25]     import http
[Sat Mar 10 21:46:18 2012] [error] [client 95.49.81.25] ImportError: No module named http