hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "T Jake Luciani (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7255) Performance regression bug caused by locking code
Date Tue, 03 May 2011 01:50:03 GMT
Performance regression bug caused by locking code
-------------------------------------------------

                 Key: HADOOP-7255
                 URL: https://issues.apache.org/jira/browse/HADOOP-7255
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 0.20.203.0
            Reporter: T Jake Luciani


While testing the 0.20.203 branch we have discovered quite a severe performance regression
caused by the following checkin:

http://svn.apache.org/viewvc?view=revision&revision=1079260

This locking seems to cause a pause of a few seconds between tasks, example with DFSIOTest:

*CURRENT CODE*
{noformat}
11/05/02 21:16:28 INFO fs.TestDFSIO: ----- TestDFSIO ----- : read
11/05/02 21:16:28 INFO fs.TestDFSIO:            Date & time: Mon May 02 21:16:28 EDT 2011
11/05/02 21:16:28 INFO fs.TestDFSIO:        Number of files: 5
11/05/02 21:16:28 INFO fs.TestDFSIO: Total MBytes processed: 500
11/05/02 21:16:28 INFO fs.TestDFSIO:      Throughput mb/sec: 303.3980582524272
11/05/02 21:16:28 INFO fs.TestDFSIO: Average IO rate mb/sec: 327.69122314453125
11/05/02 21:16:28 INFO fs.TestDFSIO:  IO rate std deviation: 78.95767116969083
11/05/02 21:16:28 INFO fs.TestDFSIO:     Test exec time sec: 19.476
11/05/02 21:16:28 INFO fs.TestDFSIO: 
{noformat}


*WITH PATCH REMOVED*
{noformat}
11/05/02 21:19:03 INFO fs.TestDFSIO: ----- TestDFSIO ----- : read
11/05/02 21:19:03 INFO fs.TestDFSIO:            Date & time: Mon May 02 21:19:03 EDT 2011
11/05/02 21:19:03 INFO fs.TestDFSIO:        Number of files: 5
11/05/02 21:19:03 INFO fs.TestDFSIO: Total MBytes processed: 500
11/05/02 21:19:03 INFO fs.TestDFSIO:      Throughput mb/sec: 366.03221083455344
11/05/02 21:19:03 INFO fs.TestDFSIO: Average IO rate mb/sec: 366.35528564453125
11/05/02 21:19:03 INFO fs.TestDFSIO:  IO rate std deviation: 11.020931463080379
11/05/02 21:19:03 INFO fs.TestDFSIO:     Test exec time sec: 3.543
11/05/02 21:19:03 INFO fs.TestDFSIO: 
{noformat}


--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message