【发布时间】：2020-10-23 07:01:54
【问题描述】：
我已经克隆了uWebSockets，写了以下文件。
#include <App.h>
#include <iostream>
int main() {
uWS::App()
.get("/*", [](auto *res, auto *req) {
res->end("Hello world!");
})
.listen(3000, [](auto *token) {
if (token) {
std::cout << "Listening on port " << 3000 << std::endl;
}
})
.run();
std::cout << "Failed to listen on port 3000" << std::endl;
return 0;
}
用它构建
make -C uWebSockets/uSockets
g++ -flto -O3 -Wconversion -std=c++17 -IuWebSockets/src -IuWebSockets/uSockets/src main.cpp -o main uWebSockets/uSockets/*.o -lz -lssl -lcrypto -luv
当我做一个基准测试时，这就是我得到的。
Concurrency Level: 100
Time taken for tests: 116.928 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 68000 bytes
HTML transferred: 12000 bytes
Requests per second: 8.55 [#/sec] (mean)
Time per request: 11692.844 [ms] (mean)
Time per request: 116.928 [ms] (mean, across all concurrent requests)
Transfer rate: 0.57 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 3 2.6 2 10
Processing: 8923 11690 921.2 11995 12012
Waiting: 0 1 1.3 0 10
Total: 8923 11693 921.7 11999 12012
Percentage of the requests served within a certain time (ms)
50% 11999
66% 12001
75% 12002
80% 12003
90% 12006
95% 12008
98% 12010
99% 12011
100% 12012 (longest request)
如果我将并发设置为 1，就会发生这种情况
Concurrency Level: 1
Time taken for tests: 61.655 seconds
Complete requests: 5
Failed requests: 0
Total transferred: 408 bytes
HTML transferred: 72 bytes
Requests per second: 0.08 [#/sec] (mean)
Time per request: 12330.911 [ms] (mean)
Time per request: 12330.911 [ms] (mean, across all concurrent requests)
Transfer rate: 0.01 [Kbytes/sec] received
我做错了吗？我错过了什么？不是应该更快吗？
PS。我在单线程上运行它。
【问题讨论】：
-
您的基准测试客户端似乎保持打开 100 个并发连接。由于只有一个线程来服务这些连接，因此每秒只会服务几个；其余的只是等待。
-
说“Hello world！”真的要花那么多时间吗？甚至 expressjs 在 node.js 中也可以做得比这更好。与异步有关吗？
-
请在下结论前先用单个并发连接进行基准测试。
-
添加了单个并发连接统计信息。更糟。
-
请注意，SO etiquette 更喜欢您创建一个自我回答，而不是编辑带有“已解决”的问题。
标签： c++ c++17 uwebsockets