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Posted to hdfs-issues@hadoop.apache.org by "Kai Zheng (JIRA)" <ji...@apache.org> on 2015/09/28 09:22:05 UTC

[jira] [Created] (HDFS-9153) DFSIO could output better throughput

Kai Zheng created HDFS-9153:
-------------------------------

             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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