造轮子的快乐！一个极快的纯 C 异步日志库

[weidaizi]

项目地址: https://github.com/MuggleWei/haclog

十一放假之前，看了一下 Nanolog 的论文，感觉思路非常赞，可惜 Nanolog 并不跨平台，而且为了性能和吞吐量，其日志输出并不直接可读。既然已经有了大体思路，接下来当然是自己撸一个啦！而且因为我也比较多 C 的库需要使用，所以就撸一个纯 C 的版本~
长假当中就断断续续写了一些，这几天在家的时间没事也写几段，今天大致到了较为满意的程度. 下面是在 Mac M1 2021 和 ThinkPad X1C 2019 上的 benchmark 结果 (测试程序可以直接在工程目录中找到： haclog gbenchmark)，欢迎各位老板们使用和提意见

Mac M1 2021

Run on (8 X 24 MHz CPU s)
CPU Caches:
  L1 Data 64 KiB
  L1 Instruction 128 KiB
  L2 Unified 4096 KiB (x8)
Load Average: 8.88, 4.53, 2.84
-----------------------------------------------------------------------------------------------------------
Benchmark                                                                 Time             CPU   Iterations
-----------------------------------------------------------------------------------------------------------
ConstIterFixture/run/min_time:3.000/threads:1                          66.3 ns         66.2 ns     60803739
ConstIterFixture/run/min_time:3.000/threads:2                          34.0 ns         67.8 ns     58196532
ConstIterFixture/run/min_time:3.000/threads:4                          24.7 ns         96.0 ns     46114032
ConstIterFixture/run/min_time:3.000/threads:7                          30.0 ns          146 ns     25301248
ConstIterFixture/run/iterations:6000/repeats:5/threads:1                120 ns          120 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1               74.8 ns         74.8 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1               65.9 ns         66.0 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1               87.8 ns         87.8 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1               79.8 ns         80.0 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1_mean          85.7 ns         85.7 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:1_median        79.8 ns         80.0 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:1_stddev        20.8 ns         20.7 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:1_cv           24.29 %         24.19 %             5
ConstIterFixture/run/iterations:6000/repeats:5/threads:4               25.6 ns          102 ns        24000
ConstIterFixture/run/iterations:6000/repeats:5/threads:4               23.0 ns         91.8 ns        24000
ConstIterFixture/run/iterations:6000/repeats:5/threads:4               28.5 ns          114 ns        24000
ConstIterFixture/run/iterations:6000/repeats:5/threads:4               27.8 ns          111 ns        24000
ConstIterFixture/run/iterations:6000/repeats:5/threads:4               28.6 ns          114 ns        24000
ConstIterFixture/run/iterations:6000/repeats:5/threads:4_mean          26.7 ns          107 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:4_median        27.8 ns          111 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:4_stddev        2.42 ns         9.71 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:4_cv            9.05 %          9.09 %             5
ConstIterFixture/run/iterations:6000/repeats:5/threads:8               16.7 ns          132 ns        48000
ConstIterFixture/run/iterations:6000/repeats:5/threads:8               17.5 ns          130 ns        48000
ConstIterFixture/run/iterations:6000/repeats:5/threads:8               17.5 ns          135 ns        48000
ConstIterFixture/run/iterations:6000/repeats:5/threads:8               16.8 ns          134 ns        48000
ConstIterFixture/run/iterations:6000/repeats:5/threads:8               16.9 ns          133 ns        48000
ConstIterFixture/run/iterations:6000/repeats:5/threads:8_mean          17.1 ns          133 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:8_median        16.9 ns          133 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:8_stddev       0.396 ns         1.64 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:8_cv            2.32 %          1.24 %             5
ConstIterFixture/run/iterations:6000/repeats:5/threads:16              7.82 ns          125 ns        96000
ConstIterFixture/run/iterations:6000/repeats:5/threads:16              8.64 ns          136 ns        96000
ConstIterFixture/run/iterations:6000/repeats:5/threads:16              13.2 ns          204 ns        96000
ConstIterFixture/run/iterations:6000/repeats:5/threads:16              7.25 ns          114 ns        96000
ConstIterFixture/run/iterations:6000/repeats:5/threads:16              11.0 ns          169 ns        96000
ConstIterFixture/run/iterations:6000/repeats:5/threads:16_mean         9.57 ns          149 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:16_median       8.64 ns          136 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:16_stddev       2.47 ns         36.7 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:16_cv          25.83 %         24.56 %             5

Thinkpad X1C 2019

Run on (12 X 1780.93 MHz CPU s)
CPU Caches:
  L1 Data 32 KiB (x6)
  L1 Instruction 32 KiB (x6)
  L2 Unified 256 KiB (x6)
  L3 Unified 12288 KiB (x1)
Load Average: 0.09, 0.03, 0.08
-----------------------------------------------------------------------------------------------------------
Benchmark                                                                 Time             CPU   Iterations
-----------------------------------------------------------------------------------------------------------
ConstIterFixture/run/min_time:3.000/threads:1                          63.8 ns         63.7 ns     65480842
ConstIterFixture/run/min_time:3.000/threads:2                          35.3 ns         70.6 ns     57795198
ConstIterFixture/run/min_time:3.000/threads:6                          28.4 ns          170 ns     19480434
ConstIterFixture/run/min_time:3.000/threads:11                         2491 ns        27350 ns       370425
ConstIterFixture/run/iterations:6000/repeats:5/threads:1                144 ns          144 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1                145 ns          144 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1                144 ns          144 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1                137 ns          136 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1                128 ns          128 ns         6000
ConstIterFixture/run/iterations:6000/repeats:5/threads:1_mean           140 ns          139 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:1_median         144 ns          144 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:1_stddev        7.14 ns         7.04 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:1_cv            5.11 %          5.06 %             5
ConstIterFixture/run/iterations:6000/repeats:5/threads:6               40.1 ns          241 ns        36000
ConstIterFixture/run/iterations:6000/repeats:5/threads:6               38.5 ns          231 ns        36000
ConstIterFixture/run/iterations:6000/repeats:5/threads:6               41.1 ns          246 ns        36000
ConstIterFixture/run/iterations:6000/repeats:5/threads:6               39.6 ns          238 ns        36000
ConstIterFixture/run/iterations:6000/repeats:5/threads:6               38.1 ns          228 ns        36000
ConstIterFixture/run/iterations:6000/repeats:5/threads:6_mean          39.5 ns          237 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:6_median        39.6 ns          238 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:6_stddev        1.20 ns         7.48 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:6_cv            3.03 %          3.16 %             5
ConstIterFixture/run/iterations:6000/repeats:5/threads:12              37.3 ns          446 ns        72000
ConstIterFixture/run/iterations:6000/repeats:5/threads:12              36.2 ns          434 ns        72000
ConstIterFixture/run/iterations:6000/repeats:5/threads:12              35.5 ns          426 ns        72000
ConstIterFixture/run/iterations:6000/repeats:5/threads:12              34.7 ns          416 ns        72000
ConstIterFixture/run/iterations:6000/repeats:5/threads:12              37.6 ns          450 ns        72000
ConstIterFixture/run/iterations:6000/repeats:5/threads:12_mean         36.3 ns          434 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:12_median       36.2 ns          434 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:12_stddev       1.21 ns         13.8 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:12_cv           3.34 %          3.19 %             5
ConstIterFixture/run/iterations:6000/repeats:5/threads:24              12.8 ns          307 ns       144000
ConstIterFixture/run/iterations:6000/repeats:5/threads:24              11.9 ns          286 ns       144000
ConstIterFixture/run/iterations:6000/repeats:5/threads:24              11.6 ns          277 ns       144000
ConstIterFixture/run/iterations:6000/repeats:5/threads:24              13.6 ns          326 ns       144000
ConstIterFixture/run/iterations:6000/repeats:5/threads:24              12.5 ns          300 ns       144000
ConstIterFixture/run/iterations:6000/repeats:5/threads:24_mean         12.5 ns          299 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:24_median       12.5 ns          300 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:24_stddev      0.783 ns         18.8 ns            5
ConstIterFixture/run/iterations:6000/repeats:5/threads:24_cv           6.27 %          6.28 %             5

[Geekgogo]

大佬

[JL1990]

强👍

[duandashen]

不得不服

[o562dsRcFqYl375i]

这可能就是热爱吧，羡慕

[hankai17]

看起来跟 我之前维护的很像 核心是多队列环形缓冲区

[heelerdeer]

NB

[cmhonker]

C 语言太蛋疼了，目前还在用 C 的只剩下信仰了吧。

[pengtdyd]

c 还是牛皮啊，搞 java ，搞 js ，搞 dart ，最后我还是被迫要搞 c ，底层不懂永远好像是少条腿走路。。。。。。

[zhs227]

滚动日志支持打成压缩包吗

[zooo]

纯 C 。。

我宁愿用 C++，都不想用 C

[hitmanx]

有一点小建议是，可能很多人都像我一样，对你这个挺感兴趣。但是既没看过这个论文，不知道创新在哪里；也不知道你这个 benchmark 究竟每一项测的是什么，甚至这个 benchmark 是你自己创造的而不是广为人知的。

如果你这个卖点就是 performance ，可能和别的产品进行相对比较会比列上几十上百个绝对值更好一些……

[zooo]

给大佬点赞，能做出来已经很🐂


我以为原版非 C++/C ，还想着用 C++去实现呢，结果原版是 C++实现的。

[weidaizi]

@huangzongzhuan 谢谢夸奖！纯粹是兴趣，乐在其中，祝你也能对技术保持长久好奇心！

[weidaizi]

@zhs227 这个的确可以加一下，但是考虑到保持日志库本身的简单，不对外部的有依赖；所以得想一下如何实现
* 自己实现
* 或是从允许商用的 LICENSE 开源压缩库里扒代码
* 或是以 extra 的形式增加一个依赖外部 gzip 的 handler
十分感谢提醒！！！

[weidaizi]

@zhs227 之后我加好了，一定来回复您！ (*^_^*)

[weidaizi]

@hitmanx 感谢提醒！的确是一个好建议！我之后会另外开一个库，可以用同一个 benchmark 的参数，来测多个不同的库，届时来回复您~

另外，项目中的 benchmark 确实我没在 README 中解释很详细，这个我的锅
其实就是使用 google benchmark 在测两部分场景
1. 设定最小的测试时间(google benchmark 中的 MinTime)，这时间中尽可能的压力测试写日志，看看当缓冲区高度紧张的情况下，日志前端写入效率如何。这个场景下测试了当线程数为 1/2/${CPU 数量的一半}/${CPU 数量 - 1} 的情况
2. 设定迭代和重复次数(google benchmark 中的 Iterations + Repetitions)，看看当缓冲区没被打满的情况下，能跑多快。这个场景下测试了当线程数为 1/${CPU 数量的一半}/${CPU 数量}/${2 倍 CPU 数量} 的情况

[enchilada2020]

好顶赞

[weidaizi]

@zooo 啊哈，是的呢，如果感兴趣可以看看我这边的源码，或者也可以看看 Nanolog 那边的源码，虽然思路相同，但是实现是完全不一样的，不过都藏了很多有趣的东西呢！
就比如一个很简单的问题：为什么 haclog 和 Nanolog 都要限定 format 字符串为字符串常量呢？ 感兴趣可以去代码里探索一下呀，哈哈哈哈哈

[weidaizi]

@zooo 啊~ 刚刚打漏了~ 谢谢你的夸奖！(*^_^*)

[xmtpw]

厉害了，大佬