网站负载过重 + ROR [英] The website is under heavy load + ROR

问题描述

我们正在 CentOS 6 上运行一个带有 ROR 的网站，带有 2 个 Web 服务器和 1 个数据库服务器.有时它会显示消息网站负载过重"...请帮助您在这里检查什么.

We are running a website with ROR on CentOS 6 with 2 web server and 1 database server. Some times it shows message "The website is under heavy load"... Can some plese help you what to check here.

我们将Passenger 4.0.21 与Ruby 1.8.7 和Apache 2.2.15 结合使用.Web 服务器以默认设置运行.

We are using Passenger 4.0.21 with Ruby 1.8.7 and Apache 2.2.15. Web server is running with the default settings.

以下是乘客状态的一些输出:

Below is some output of passenger-status:

#passenger-status

Version : 4.0.21
Date    : Thu Dec 12 02:02:44 -0500 2013
Instance: 20126
----------- General information -----------
Max pool size : 6
Processes     : 6
Requests in top-level queue : 0

----------- Application groups -----------
/home/web/html#default:
  App root: /home/web/html
  Requests in queue: 100
  * PID: 20290   Sessions: 1       Processed: 53      Uptime: 24h 3m 5s
    CPU: 0%      Memory  : 634M    Last used: 23h 16m 8
  * PID: 22657   Sessions: 1       Processed: 37      Uptime: 23h 15m 55s
    CPU: 0%      Memory  : 609M    Last used: 22h 44m
  * PID: 29147   Sessions: 1       Processed: 146     Uptime: 20h 47m 48s
    CPU: 0%      Memory  : 976M    Last used: 18h 20m
  * PID: 22216   Sessions: 1       Processed: 26      Uptime: 10h 3m 19s
    CPU: 0%      Memory  : 538M    Last used: 9h 44m 4
  * PID: 23306   Sessions: 1       Processed: 75      Uptime: 9h 43m 22s
    CPU: 0%      Memory  : 483M    Last used: 8h 44m 4
  * PID: 25626   Sessions: 1       Processed: 115     Uptime: 8h 46m 42s
    CPU: 0%      Memory  : 540M    Last used: 7h 59m 5

推荐答案

队列中的请求过多.从 4.0.15 版本开始，默认限制为 100.这是 http://blog.phusion.nl 的简短摘录/2013/09/06/phusion-passenger-4-0-16-released/ 其中说:

You have too many requests in queue. Since version 4.0.15 there is a limit which is 100 by default. Here is a short excerpt from http://blog.phusion.nl/2013/09/06/phusion-passenger-4-0-16-released/ which says:

Phusion 乘客现在会向客户端显示错误消息，如果太多请求被排队，而不是让他们等待.这么多提高服务质量.默认情况下，too many"是 100.你可以使用 PassengerMaxRequestQueueSize (Apache) 或passenger_max_request_queue_size (Nginx).

Phusion Passenger now displays an error message to clients if too many requests are queued up, instead of letting them wait. This much improves quality of service. By default, "too many" is 100. You may customize this with PassengerMaxRequestQueueSize (Apache) or passenger_max_request_queue_size (Nginx).

查看关于此的用户指南:http://www.modrails.com/documentation/Users%20guide%20Apache.html#PassengerMaxRequestQueueSize

Have a look at the user guide about this: http://www.modrails.com/documentation/Users%20guide%20Apache.html#PassengerMaxRequestQueueSize

您可以尝试增加它或将其设置为 0 以禁用它.

You could try increasing it or setting it to 0in order to disable it.

编辑

您还应该检查您的日志以查看是否有请求时间过长.也许您的代码中有一些进程花费的时间太长.我更喜欢使用 NewRelic 来监控这些东西.

You should also check your logs to see whether there are requests which take too long. Maybe you have some processes in your code that take too long. I prefer using NewRelic for monitoring those things.

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