Google 云 CDN，使用 apache 基准进行性能测试

Question

我一直在从部署在 Google App Engine 上的 NodeJS 应用程序提供静态文件，我现在设置了一个启用了 CDN 的 Google 云负载平衡器 (GCLB) 并移动了我的静态文件到后端使用的云存储桶中。

整个过程运行良好，但问题是使用 Apache Benchmark 测试时性能没有提高。

正在测试 1000 个请求，并发级别为 100：

Document Length:        748366 bytes

Concurrency Level:      100
Time taken for tests:   37.069 seconds
Complete requests:      1000
Failed requests:        1
   (Connect: 0, Receive: 0, Length: 1, Exceptions: 0)
Total transferred:      748686041 bytes
HTML transferred:       747940252 bytes
Requests per second:    26.98 [#/sec] (mean)
Time per request:       3706.873 [ms] (mean)
Time per request:       37.069 [ms] (mean, across all concurrent requests)
Transfer rate:          19723.87 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0  446 748.1    261    9033
Processing:   397 2920 2407.1   2252   17769
Waiting:       31   85 109.7     56    1595
Total:        444 3366 2578.2   2665   18986

Percentage of the requests served within a certain time (ms)
  50%   2665
  66%   3702
  75%   4410
  80%   4937
  90%   6504
  95%   8125
  98%  10853
  99%  13447
 100%  18986 (longest request)

正在测试 1000 个请求，并发级别为 10：

Document Length:        748366 bytes

Concurrency Level:      10
Time taken for tests:   35.386 seconds
Complete requests:      1000
Failed requests:        0
Total transferred:      749112083 bytes
HTML transferred:       748366000 bytes
Requests per second:    28.26 [#/sec] (mean)
Time per request:       353.863 [ms] (mean)
Time per request:       35.386 [ms] (mean, across all concurrent requests)
Transfer rate:          20673.37 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       20   74  96.3     41     757
Processing:    98  278 159.5    240    2165
Waiting:       30   59  67.0     49    1915
Total:        135  352 196.6    290    2201

Percentage of the requests served within a certain time (ms)
  50%    290
  66%    334
  75%    381
  80%    442
  90%    577
  95%    742
  98%    935
  99%   1152
 100%   2201 (longest request)

我预计并发级别不会显着增加处理请求所花费的时间。也许我以某种方式误读了这些结果？

需要注意的另一个（相关）问题是 CDN 缓存命中在 Google LB UI.

中显示为 0

Answer 1

听起来您的文件没有被缓存。 Cloud CDN 仅缓存满足 cloud.google.com/cdn/docs/caching#cacheability. You can use the troubleshooting steps at cloud.google.com/cdn/docs/troubleshooting#responses-not-cached 中列出的条件的响应以识别特定问题。如果这没有帮助，如果您分享具体的 URL，我很乐意看一看。

您可能知道，ab 并不是评估 CDN 性能的最现实的方法，您会运行在遇到云中的任何瓶颈之前很久就在本地计算机上遇到瓶颈CDN 本身。如果您使用 ab，请确保指定 -k 选项。如果不这样做，您可以运行离开临时端口。

Google 云 CDN，使用 apache 基准进行性能测试

Google cloud CDN, performance testing using apache benchmark

google-app-engine

apachebench

google-cdn

google-cloud-platform