flat  flat%   sum%        cum   cum%
     9.05s 33.91% 33.91%      9.27s 34.73%  syscall.Syscall
     1.42s  5.32% 39.23%      1.42s  5.32%  runtime.asyncPreempt
     1.31s  4.91% 44.14%      1.31s  4.91%  runtime.futex
     0.66s  2.47% 46.61%      0.66s  2.47%  runtime.memmove
     0.66s  2.47% 49.08%      1.26s  4.72%  runtime.scanobject
     0.64s  2.40% 51.48%      0.68s  2.55%  runtime.lock2
     0.51s  1.91% 53.39%      0.51s  1.91%  runtime.usleep
     0.47s  1.76% 55.15%      0.48s  1.80%  runtime.(*waitq).dequeue
     0.44s  1.65% 56.80%     18.51s 69.35%  chat/Server.(*Client).writePump
     0.44s  1.65% 58.45%      0.48s  1.80%  runtime.findObject
     0.39s  1.46% 59.91%      1.23s  4.61%  runtime.selectgo
     0.37s  1.39% 61.30%      0.90s  3.37%  encoding/json.compact
     0.36s  1.35% 62.65%      1.26s  4.72%  time.Time.AppendFormat
     0.33s  1.24% 63.88%      0.44s  1.65%  internal/poll.runtime_pollSetDeadline
     0.29s  1.09% 64.97%      4.71s 17.65%  encoding/json.structEncoder.encode
     0.27s  1.01% 65.98%      0.90s  3.37%  runtime.gentraceback
     0.24s   0.9% 66.88%      2.65s  9.93%  runtime.mallocgc
     0.23s  0.86% 67.74%      0.57s  2.14%  encoding/json.(*encodeState).string
     0.22s  0.82% 68.57%      0.23s  0.86%  runtime.gopark
     0.20s  0.75% 69.31%      0.20s  0.75%  runtime.nextFreeFast (inline)