Apache 停止处理请求 (mod_wsgi?) [英] Apache stops processing requests (mod_wsgi?)

问题描述

在某些时候，我的站点在带有 mod_wsgi 的 Apache2 上运行只是停止处理请求.与服务器的连接被维护，客户端等待响应，但它永远不会被 apache 返回.此时的服务器 CPU 使用率为 0%，没有任何处理.我认为，apache 只是将请求发送到队列，而永远不会将它们从那里取出.当我执行 apache2ctl graceful 时，问题没有解决.只有在apache2ctl restart之后.

At some point my site, running on Apache2 with mod_wsgi just stops processing requests. The connection to server is maintained and client waits for responce, but it never is returned by apache. The server at this time is at 0% CPU, and nothing is processing. I think, apache just sends request to queue and never gets them out of there. When I perform apache2ctl graceful the problem does not resolve. Only after apache2ctl restart.

我的站点是 Pyramid 的 4 个实例 wsgi 应用程序和 Zope 3 的 2 个实例.它运行正常并且没有速度问题，我知道.

My site is a 4 instance wsgi application of Pyramid and 2 instances of Zope 3. It is running normaly and does not have speed problems, that I am aware of.

版本:Ubuntu 10.04apache2 2.2.14-5ubuntu8.9libapache2-mod-wsgi 2.8-2ubuntu1

versions: Ubuntu 10.04 apache2 2.2.14-5ubuntu8.9 libapache2-mod-wsgi 2.8-2ubuntu1

推荐答案

听起来您正在使用嵌入式模式来运行多个应用程序，而您正在使用在子解释器中存在问题的第三方 C 扩展，从而导致潜在的死锁.否则，您的代码在内部死锁或阻塞外部服务并且永远不会返回，从而导致可用进程/线程耗尽.

Sounds like you are using embedded mode to run the multiple applications and you are using third party C extensions that have problems in sub interpreters, resulting in potential deadlock. Else your code is internally deadlocking or blocking on external services and never returning, causing exhaustion of available processes/threads.

首先，您应该考虑使用守护进程模式并将每个 Web 应用程序委托给不同的守护进程组，然后强制每个应用程序在主解释器中运行.

For a start, you should look at using daemon mode and delegate each web application to a distinct daemon process group and then forcing each to run in the main interpreter.

见:

http://code.google.com/p/modwsgi/wiki/QuickConfigurationGuide#Delegation_To_Daemon_Processhttp://code.google.com/p/modwsgi/wiki/ApplicationIssues#Python_Simplified_GIL_State_API

http://code.google.com/p/modwsgi/wiki/QuickConfigurationGuide#Delegation_To_Daemon_Process http://code.google.com/p/modwsgi/wiki/ApplicationIssues#Python_Simplified_GIL_State_API

否则使用如下所述的调试技巧:

Otherwise use debugging tips described in:

http://code.google.com/p/modwsgi/wiki/DebuggingTechniques

用于获取有关应用程序正在执行的操作的堆栈跟踪.

for getting stack traces about what application is doing.

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