解决win32 X64下的gettimeofday非常缓慢的问题 #51
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非常感谢。 文档名称可以改为 最后，能否将5个commits合并一下为一个commits？（可能需要重新开一个PR）。再次感谢。 |
zieckey
reviewed
Jun 26, 2017
docs/quick_start_win32_vs2015.md
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| - git.exe available in your path. You can download and install it from [https://git-for-windows.github.io/] | ||
| - vcpkg. You can download and install it from [https://github.com/Microsoft/vcpkg]. Commits c5daa93506b616d253e257488ecc385271238e2a tests OK. Following [https://github.com/Microsoft/vcpkg#quick-start](https://github.com/Microsoft/vcpkg#quick-start) to install [vcpkg]. This document assumes that [vcpkg] is installed at `d:\git\vcpkg`. | ||
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| #### Install dependent libraries by using vcpkg | ||
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| Use [vcpkg] to install libevent,glog,gtest,gflags. | ||
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| ## for win_x32: |
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好的 |
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1、文档里增加了win32 X64的配置编译方式（不过这个文件名还是win32， 有点怪怪的）。
2、文档中说使用的cmake 为3.8以上版本是不对的，实际使用发现cmake3.9是编译不了的。
3、win32 x64的getimeofday 的benchmark显示，gettimeofday慢得不是一个等级的。bechmark如下：
gettimeofday_benchmark loop=10000000 cost=5.07226s op=507.226ns/op QPS=1925.3k system_clock_benchmark loop=10000000 cost=0.777856s op=77.7856ns/op QPS=12554.5k steady_clock_benchmark loop=10000000 cost=1.01353s op=101.353ns/op QPS=9635.3k high_resolution_clock_benchmark loop=10000000 cost=1.0262s op=102.62ns/op QPS=9516.34k参考nginx的gettimeofday（https://github.com/nginx/nginx/blob/f8a9d528df92c7634088e575e5c3d63a1d4ab8ea/src/os/win32/ngx_time.c ）：
gettimeofday_benchmark loop=10000000 cost=0.586243s op=58.6243ns/op QPS=16658k
system_clock_benchmark loop=10000000 cost=0.790204s op=79.0204ns/op QPS=12358.4k
steady_clock_benchmark loop=10000000 cost=1.00596s op=100.596ns/op QPS=9707.73k
high_resolution_clock_benchmark loop=10000000 cost=1.00085s op=100.085ns/op QPS=9757.3k