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Posted to mapreduce-user@hadoop.apache.org by baran cakici <ba...@gmail.com> on 2011/05/03 12:26:08 UTC

TestDFSIO Bechmark

Hi,

I want to know I/O Performance of my Hadoop Cluster. Because of that I ran
test.jar, hier is my Results;

----- TestDFSIO ----- : write
Date & time: Mon May 02 14:38:29 CEST 2011
Number of files: 10
Total MBytes processed: 10000
Throughput mb/sec: 12.809033955468113
Average IO rate mb/sec: 13.16771411895752
IO rate std deviation: 2.059995952372142
Test exec time sec: 964.4

----- TestDFSIO ----- : read
Date & time: Mon May 02 15:00:10 CEST 2011
Number of files: 10
Total MBytes processed: 10000
Throughput mb/sec: 12.938200684430816
Average IO rate mb/sec: 14.908231735229492
IO rate std deviation: 4.231364683566859
Test exec time sec: 941.601

read-speed and write-speed almost same!!! Why can't I read faster?

thanks,

Baran

Re: TestDFSIO Bechmark

Posted by Konstantin Boudnik <co...@apache.org>.

[taking common-@ and hdfs-@ lists to Bcc:]
Please do not cross-post.On Tue, May 3, 2011 at 03:26, baran cakici
<ba...@gmail.com> wrote:
> Hi,
>
> I want to know I/O Performance of my Hadoop Cluster. Because of that I ran
> test.jar, hier is my Results;
>
> ----- TestDFSIO ----- : write
> Date & time: Mon May 02 14:38:29 CEST 2011
> Number of files: 10
> Total MBytes processed: 10000
> Throughput mb/sec: 12.809033955468113
> Average IO rate mb/sec: 13.16771411895752
> IO rate std deviation: 2.059995952372142
> Test exec time sec: 964.4
>
> ----- TestDFSIO ----- : read
> Date & time: Mon May 02 15:00:10 CEST 2011
> Number of files: 10
> Total MBytes processed: 10000
> Throughput mb/sec: 12.938200684430816
> Average IO rate mb/sec: 14.908231735229492
> IO rate std deviation: 4.231364683566859
> Test exec time sec: 941.601
>
> read-speed and write-speed almost same!!! Why can't I read faster?
>
> thanks,
>
> Baran