动态评估bytes.Buffer的需求的容量，全局共享bytes.Buffer池#16
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thinkeridea merged 2 commits intomainfrom Feb 5, 2021
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@@ Coverage Diff @@
## main #16 +/- ##
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Coverage 90.77% 90.77%
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Files 25 26 +1
Lines 791 802 +11
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+ Hits 718 728 +10
- Misses 51 52 +1
Partials 22 22
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采用全局共享不同容量区间（采用2的幂次方来划分），一共 22 个区间，最小64 byte， 最大 256 MB， 根据动态计算，在获取
bytes.Buffer时从相应桶的sync.Pool来获取，以减少多余的内存浪费及bytes.Buffer扩容次数。相较于使用固定容量的
sync.Pool在需求容量动态波动时可以获取30~40倍的性能提升（这并不包含GC带来的性能提升，那将是更令人兴奋的），在内存分配上可以减少近300倍。即使在每次都获取固定容量，且不发生扩容的情况（这会导致动态池只是用单个桶），
sync.Pool并没有带来很大的惊喜，动态池相较于sync.Pool性能略下降 28%， 单次约 17ns， 即使这样这依然让人振奋，大多数我们都在处理不同大小的数据，使用动态bytes.Buffer共享池我们将收益巨大。