如何找出使用cpu过高的代码
最近网站搞活动，订单量比往常多好几倍，期间发现两台api的cpu使用率都达到了60%，内存使用率正常。初步怀疑是订单量大的原因，所以在看购物车、结算、提交订单这块的代码，但是光凭感觉也没啥用，所以在想有什么工具能跟踪到程序中哪些代码cpu使用高，然后针对性的优化。网上搜了下，发现没这块的工具，xdebug也只是针对代码的运行时间，但是我想知道的是cpu这块的，不知道大家有什么方法或者工具能帮助找出需要优化的代码块
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最近网站搞活动，订单量比往常多好几倍，期间发现两台api的cpu使用率都达到了60%，内存使用率正常。初步怀疑是订单量大的原因，所以在看购物车、结算、提交订单这块的代码，但是光凭感觉也没啥用，所以在想有什么工具能跟踪到程序中哪些代码cpu使用高，然后针对性的优化。网上搜了下，发现没这块的工具，xdebug也只是针对代码的运行时间，但是我想知道的是cpu这块的，不知道大家有什么方法或者工具能帮助找出需要优化的代码块
建议了解下APM，比如:http://www.oneapm.com/ai/php.html
"性能"归根结底是时间
cpu使用高是现象, 更根本的原因是新请求来时旧请求还没完 (假定你没有在php写线程调度, 自旋锁等东西)
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