Kai Zheng created HDFS-9153:
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Summary: DFSIO could output better throughput
Key: HDFS-9153
URL: https://issues.apache.org/jira/browse/HDFS-9153
Project: Hadoop HDFS
Issue Type: Test
Reporter: Kai Zheng
Assignee: Kai Zheng
Ref. the following DFSIO output, I was surprised the test throughput was only
{{17}} MB/s, which doesn't make sense for a real cluster. Maybe it's used for
other purpose? For users, it may make more sense to give the throughput 1610
MB/s (1228800/763), calculated by *Total MBytes processed / Test exec time*.
{noformat}
15/09/28 11:42:23 INFO fs.TestDFSIO: ----- TestDFSIO ----- : write
15/09/28 11:42:23 INFO fs.TestDFSIO: Date & time: Mon Sep 28
11:42:23 CST 2015
15/09/28 11:42:23 INFO fs.TestDFSIO: Number of files: 100
15/09/28 11:42:23 INFO fs.TestDFSIO: Total MBytes processed: 1228800.0
15/09/28 11:42:23 INFO fs.TestDFSIO: Throughput mb/sec: 17.457387239456878
15/09/28 11:42:23 INFO fs.TestDFSIO: Average IO rate mb/sec: 17.57563018798828
15/09/28 11:42:23 INFO fs.TestDFSIO: IO rate std deviation: 1.7076328985378455
15/09/28 11:42:23 INFO fs.TestDFSIO: Test exec time sec: 762.697
15/09/28 11:42:23 INFO fs.TestDFSIO:
{noformat}
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