CPUCPUbugCPUTime: Mar 22, 2019 at 5:52pm (CST)
Duration: 1mins, Total samples = 1.43mins (142.57%)
Entering interactive mode (type "help" for commands, "o" for options)
(pprof) tree
Showing nodes accounting for 83.13s, 97.11% of 85.60s total
Dropped 256 nodes (cum <= 0.43s)
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flat flat% sum% cum cum% calls calls% + context
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71.36s 99.86% | runtime.gcDrain
0.10s 0.14% | runtime.systemstack
48.56s 56.73% 56.73% 71.46s 83.48% | runtime.scanobject
11.86s 16.60% | runtime.heapBitsForObject
11.04s 15.45% | runtime.greyobject
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11.86s 99.92% | runtime.scanobject
11.87s 13.87% 70.60% 11.87s 13.87% | runtime.heapBitsForObject
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11.04s 100% | runtime.scanobject
11.02s 12.87% 83.47% 11.04s 12.90% | runtime.greyobject
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6.53s 95.05% | runtime.gosweepone.func1
0.34s 4.95% | runtime.(*mheap).alloc
4.34s 5.07% 88.54% 6.87s 8.03% | runtime.sweepone
2.53s 36.83% | runtime.(*mspan).sweep
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74.42s 100% | runtime.gcBgMarkWorker.func2
1.97s 2.30% 90.84% 74.42s 86.94% | runtime.gcDrain
71.36s 95.89% | runtime.scanobject
0.52s 0.7% | runtime.pollWork
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buffer pool // 这里不再分配新的内存，而是从 buffer pool 里面 GET
databuf = make([]byte, 100000)
buffer poolGetPutGetPutbyte
GolangGolangCPUCPU解决办法
buffer poolbuffer poolbuffer poolGetPut
buffer poolCPU打个比方
比如说操作系统就是一个土豪，借东西再换回来不收利息。它有一个很大的内存，周围许多人都想找它去借(新声明的变量并初始化)，刚开始借的人只有十几个，后面有上万个，于是它要每天记录谁借了多少内存出去，谁还没有归还，归还的直接从记录上把名字划掉(垃圾回收)。后来操作系统烦了，于是就建了一个很大的内存池，够所有人分批次借，只要借完及时归还就行，而它每次去看这个内存池有没有变小即可，省了不少精力。
go buffer pool注意
GetPutCPUGolang