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即使未达到限制，php fpm 也会生成新的子项

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即使未达到限制，php fpm 也会生成新的子项

我的 php fpm 进程给出以下警告：

[29-Apr-2014 13:06:10] WARNING: [pool www] seems busy (you may need to
increase pm.start_servers, or pm.min/max_spare_servers), spawning 8
children, there are 19 idle, and 51 total children

[29-Apr-2014 13:07:09] WARNING: [pool www] seems busy (you may need to increase
pm.start_servers, or pm.min/max_spare_servers), spawning 8 children,
there are 14 idle, and 47 total children [29-Apr-2014 13:07:10]

WARNING: [pool www] seems busy (you may need to increase
pm.start_servers, or pm.min/max_spare_servers), spawning 16 children,
there are 17 idle, and 53 total children [29-Apr-2014 13:07:11]

WARNING: [pool www] seems busy (you may need to increase
pm.start_servers, or pm.min/max_spare_servers), spawning 32 children,
there are 14 idle, and 56 total children [29-Apr-2014 13:07:12]

WARNING: [pool www] seems busy (you may need to increase
pm.start_servers, or pm.min/max_spare_servers), spawning 32 children,
there are 19 idle, and 62 total children [29-Apr-2014 13:07:13]

WARNING: [pool www] seems busy (you may need to increase
pm.start_servers, or pm.min/max_spare_servers), spawning 32 children,
there are 18 idle, and 63 total children [29-Apr-2014 13:07:14]

我的 fpm.conf 是：

pm.max_children = 161
pm.start_servers = 20
pm.min_spare_servers = 20
pm.max_spare_servers = 40
pm.max_requests = 1000

我的问题是

  1. 为什么即使我没有达到 max_children 值，也会生成子进程？是因为有额外的流量，而且因为空闲子进程需要达到最低 20 个，所以它们不能被用完吗？

  2. 这是否会给我的系统造成开销？

答案1

为什么即使我没有达到 max_children 值也会生成子代？

因为这是最大值。一旦达到最大值，就不会再创建更多，但在此之前，PHP-FPM 会在需要额外容量时添加工作器。使用您的设置，您将始终拥有至少 20 台服务器，最多不超过 161 台，并且当少于 20 台空闲时 FPM 会添加服务器，当超过 40 台空闲时 FPM 会删除服务器。

答案2

您有pm.min_spare_servers = 20，并且它正在低于 20 个空闲子进程的限制，并生成更多子进程以回到 min_spare_servers 数量。降低此值以减少发生的频率。它旨在抵消负载峰值并拥有足够的子进程来满足需求。

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