php网站cpu一直非常高
由于网站访问量大，电脑的cpu一直非常高，周五晚上挂了，周六又重启了。
结果今天发现还是非常高，看了下，主要是php生成大量图片，需要耗费很多cpu。
怎么办？图片主要是添加文字和水印，有的一次请求会对20张图片做处理。
------解决思路----------------------
php的gd库是用c实现的，我以前测试过，和直接用c生成效率基本差不多，所以图片处理这块，我觉得怎么优化都要耗费服务器资源，优化空间不大。
如果图片处理可以不用实时的，不需要立马展示给用户
把图片处理做成异步的，让后台启动php脚本来跑，每次最多处理的图片数做限制，这样电脑压力不会太高。
要是不行，那就只能做成分布式缓解压力了。
------解决思路----------------------
一个请求处理多张图片应该不是问题
问题应该在你允许的并发数是否过多
加大 web 服务器的并发响应数的同时，是需要同时增加内存的
不然频繁的交换区操作，必将造成 cpu 的调度负担
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