performance - apache bench 中连接、处理、等待的定义

Question

当我运行 apache bench 时，我得到如下结果:

Command: abs.exe -v 3 -n 10 -c 1 https://mysite
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:      203  213   8.1    219     219
Processing:    78  177  88.1    172     359
Waiting:       78  169  84.6    156     344
Total:        281  389  86.7    391     564

我似乎找不到连接、处理和等待的定义。这些数字是什么意思？

Answer 1

通过查看源代码，我们发现这些时间点:

apr_time_t start,           /* Start of connection */
           connect,         /* Connected, start writing */
           endwrite,        /* Request written */
           beginread,       /* First byte of input */
           done;            /* Connection closed */

当请求完成时，一些计时存储为:

        s->starttime = c->start;
        s->ctime     = ap_max(0, c->connect - c->start);
        s->time      = ap_max(0, c->done - c->start);
        s->waittime  = ap_max(0, c->beginread - c->endwrite);

“处理时间”稍后计算为

s->time - s->ctime;

因此，如果我们将其转换为时间线:

t1: Start of connection
t2: Connected, start writing
t3: Request written
t4: First byte of input
t5: Connection closed

那么定义将是:

Connect:      t1-t2   Most typically the network latency
Processing:   t2-t5   Time to receive full response after connection was opened
Waiting:      t3-t4   Time-to-first-byte after the request was sent
Total time:   t1-t5