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我在通过 10G 以太网连接的两个节点上运行 MongoDb 和 YCSB,工作负载 A(读取:更新 = 50:50)。

ycsb 输出结果看起来不错,但只有一件事:为什么更新延迟那么小?更新延迟是否仅包括 MongoDb 本地操作延迟?

例如,在下面的运行中,更新延迟只有大约 4 微秒。但是我的网络延迟是 100+ 微秒。所以这对我来说很奇怪。

谢谢!

YCSB Client 0.1
Command line: -db com.yahoo.ycsb.db.AsyncMongoDbClient -s -P LisWorkloadA -p mongodb.url=mongodb://192.168.4.168:27017/ycsb?w=0 -threads 1 -t
mongo connection created with mongodb://192.168.4.168:27017/ycsb?w=0
18:09:22.758 [Thread-1] DEBUG c.a.m.c.c.b.BootstrapConnectionFactory - Simple MongoDB bootstrap to 192.168.4.168/192.168.4.168:27017.
18:24:23.109 [Thread-1] DEBUG c.a.mongodb.client.ClientImpl - MongoDB Connection closed: MongoDB(56194-->192.168.4.168/192.168.4.168:27017)
[OVERALL], RunTime(ms), 900433.0
[OVERALL], Throughput(ops/sec), 2878.1730567404793
[READ], Operations, 1296287.0

***[READ], AverageLatency(us), 687.2264621954861***

[READ], MinLatency(us), 105.0
[READ], MaxLatency(us), 5455871.0
[READ], 95thPercentileLatency(us), 1220.0
[READ], 99thPercentileLatency(us), 1749.0
[READ], Return=OK, 1296287
[CLEANUP], Operations, 1.0
[CLEANUP], AverageLatency(us), 1672.0
[CLEANUP], MinLatency(us), 1672.0
[CLEANUP], MaxLatency(us), 1672.0
[CLEANUP], 95thPercentileLatency(us), 1672.0
[CLEANUP], 99thPercentileLatency(us), 1672.0
[UPDATE], Operations, 1295315.0

***[UPDATE], AverageLatency(us), 4.323250329070535***

[UPDATE], MinLatency(us), 1.0
[UPDATE], MaxLatency(us), 42015.0
[UPDATE], 95thPercentileLatency(us), 6.0
[UPDATE], 99thPercentileLatency(us), 10.0
[UPDATE], Return=NOT_FOUND, 1295315
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1 回答 1

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10G 以太网的延迟可以低至 2 微秒,因此 MongoDB 报告的数字是可能的。你确定你的 100+ 微秒测量是正确的吗?它可能包括一些开销。

于 2016-05-30T17:45:09.420 回答