XHProf 分析结果 负数 表示什么意思
今天为了测试，自己写的东西性能如何，XHProf得到的结果让我看不懂了，居然 Excl.MemUse(bytes)（ 函数执行本身内存）的结果是负数，不知道什么意思，请求大神
回复讨论(解决方案)
有人在吗？ 求救啊
你的 Excl.Memuse 不是在读取缓存是才表现为空的吗？
这样计算内存的占用似乎没有什么不妥的
你的 Excl.Memuse 不是在读取缓存是才表现为空的吗？
这样计算内存的占用似乎没有什么不妥的
能具体说明白点吗？ 还是不太懂你的意思！
我是不是可以理解负数 是请求的内存 没有正真的使用 ，
正数的内存 就是使用的内存
Excl. CPU(microsec) 指的是 函数执行本身花费的cpu时间
在 Excl.Memuse 为负数的时，所消耗的cpu时间为0，也就是说，根本就没有去运行。
不知道我理解的对不对
Excl.Memuse（应该是用户内存）出现负数的地方是在执行 Cache_module::get
而从运行意义上说 cache 实际可以认为就在内存中了，所以他在计算时扣除了这部分容量（当然实际上是需要占用内存的）。毕竟他是一个优化分析工具而不是资源监测工具
http://stackoverflow.com/questions/17804849/interpreting-xhprof-results-why-yield-negative-values-of-memuse
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