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| // BSD 3-Clause License | |
| // | |
| // Copyright (c) 2017, 0qdk4o | |
| // All rights reserved. | |
| // | |
| // Redistribution and use in source and binary forms, with or without | |
| // modification, are permitted provided that the following conditions are met: | |
| // | |
| // * Redistributions of source code must retain the above copyright notice, this | |
| // list of conditions and the following disclaimer. |
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| // 有四个线程1、2、3、4。线程1的功能就是输出1，线程2的功能就是输出2，以此类推......... | |
| // 现在有四个文件ABCD。初始都为空。现要让四个文件呈如下格式： | |
| // A：1 2 3 4 1 2.... | |
| // B：2 3 4 1 2 3.... | |
| // C：3 4 1 2 3 4.... | |
| // D：4 1 2 3 4 1.... | |
| // 没必要用chan chan的切换代价是很大的 我一般能不用就不用，观察规律好像这样也可以生成目标文件 | |
| // 并且是用四个coroutine 写文件可以先写缓冲区再一次写4K或16K 这样会更高效 但这并不是本问题重点 |
0qdk4o
/ gist:2d02b059ac26e66d952f90bd4cff96ee
Last active
September 24, 2017 11:56
golang string concatenation performance
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| 首先参考 http://herman.asia/efficient-string-concatenation-in-go | |
| 另外补充: 连接效率，内存使用率还与所连接字符串长度本身是有影响的 | |
| 与本机核数多少依然有影响 | |
| 以下测试均在go version go1.9 | |
| func BenchmarkBuffer(b *testing.B) { | |
| b.ReportAllocs() | |
| b.ResetTimer() |