在运行时更改 Passenger 应用程序池大小
是否可以在运行时更改 Passenger 应用程序池大小？即，无需重新启动 apache，且不会中断活动访问者？
每天的同一时间我们都会运行后台作业。它非常占用内存。由于在此期间，网站上的流量往往相对较低，因此我希望在作业运行之前自动减少运行的应用程序服务器的数量，然后在作业完成时再次扩大。
Is it possible to change the Passenger application pool size at runtime? Ie, without restarting apache, and without disrupting active visitors?
The same time every day we have a background job run. It is very memory intensive. Since during that time, traffic on the site tends to be relatively low, I would like to automatically scale down the number of application servers running just before the jobs runs, and then scale up again when it is finished.
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乘客应在不使用实例时自动关闭实例。由于您的流量较低，因此您不应该运行任何不必要的乘客实例。
您可以调整的一个变量是 PassengerPoolIdleTime。这告诉乘客在关闭空闲实例之前需要等待多长时间。
没有 PoolSize 变量。然而，有一个 MaxPoolSize，但除非您收到大量流量，否则不应达到此限制。
您可以在此处找到所有变量及其作用： http://www.modrails .com/documentation/Users%20guide.html
如果您确实想动态更改设置，可以尝试调用
sudo /etc/init.d/apache2 reload。这将告诉 apache 重新加载其设置，包括乘客配置。祝你好运！
Passenger should automatically shut down instances when they are not in use. Since your traffic is low then you should not have any unnecessary passenger instances running.
One variable you can tweak is PassengerPoolIdleTime. This tells passenger how long to wait before shutting down idle instances.
There is no PoolSize variable. There is however a MaxPoolSize but this limit should not be hit unless you are receiving heavy traffic.
You can find all the variables along with what they do here: http://www.modrails.com/documentation/Users%20guide.html
If you really want to change the settings dynamically, you can try calling
sudo /etc/init.d/apache2 reload. This will tell apache to reload its settings, including the passenger configuration.Good luck!