node.js - 性能不佳(Node.js 从 MongoDB 提供数据)

Question

我有一个 MongoDB，其中包含约 100 个文档的小集合。我想一次返回所有文档 ~50KB(使用 Node 和 Mongoose)

Items.find().stream().pipe(JSONStream.stringify(false)).pipe(res);

通过此命令使用 ApacheBench

ab -r -n 100 -c 10 http://127.0.0.1:8080/api/stress

我得到了这个结果

Document Path:          /api/stress
Document Length:        52866 bytes

Concurrency Level:      10
Time taken for tests:   5.738 seconds
Complete requests:      100
Failed requests:        0
Total transferred:      5308266 bytes
HTML transferred:       5286600 bytes
Requests per second:    17.43 [#/sec] (mean)
Time per request:       573.783 [ms] (mean)
Time per request:       57.378 [ms] (mean, across all concurrent requests)
Transfer rate:          903.45 [Kbytes/sec] received

Connection Times (ms)
            min  mean[+/-sd] median   max
Connect:        0    0   0.3      0       1
Processing:   312  558  95.5    562     853
Waiting:       20  305 118.9    303     527
Total:        312  558  95.6    562     854

Percentage of the requests served within a certain time (ms)
50%    562
66%    582
75%    605
80%    626
90%    670
95%    715
98%    822
99%    854
100%    854 (longest request)

Document Path:          /api/stress
Document Length:        52866 bytes

Concurrency Level:      10
Time taken for tests:   5.738 seconds
Complete requests:      100
Failed requests:        0
Total transferred:      5308266 bytes
HTML transferred:       5286600 bytes
Requests per second:    17.43 [#/sec] (mean)
Time per request:       573.783 [ms] (mean)
Time per request:       57.378 [ms] (mean, across all concurrent requests)
Transfer rate:          903.45 [Kbytes/sec] received

Connection Times (ms)
            min  mean[+/-sd] median   max
Connect:        0    0   0.3      0       1
Processing:   312  558  95.5    562     853
Waiting:       20  305 118.9    303     527
Total:        312  558  95.6    562     854

Percentage of the requests served within a certain time (ms)
50%    562
66%    582
75%    605
80%    626
90%    670
95%    715
98%    822
99%    854
100%    854 (longest request)

每秒请求数:17.43(看起来太少了。)

返回10条记录时

Notes.find().limit(10).stream().pipe(JSONStream.stringify(false)).pipe(res);

每秒请求数:146.53(女巫看起来不错。)

所以我想知道，我是在解释数据错误还是做错了什么？因为我期望从 MongoDB 返回更多的数据来获得更好的性能。

我正在使用带有 Node 和 Mongo 的本地 Windows 计算机 (i7/8GB)

Answer 1

100 个查询文档在 20 毫秒内返回，10 个结果在 2 毫秒内返回，然后 Node 完成了一些工作，总共 100 行给每个请求 50 毫秒，每秒给我 20 个请求。不太好，但我想我现在必须处理它..