Dynamo on Linux: Random Write issues

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Dynamo on Linux: Random Write issues

Coyne, Kate

Hello,

 I am running on this configuration:

            Linux 2.6.9-15.ELsmp #1 SMP Fri Aug 5 19:02:59 EDT 2005 i686 i686 i386 GNU/Linux

on a Dell2650(Intel(R) Xeon(TM) CPU 2.40GHz twin hyperthreaded with only 512MB Ram(I am trying to use as little cache as possible).

Glibc is 2.3.4-2.12.

 

I downloaded Iometer i386 prebuild binary version down to my system. Version 2004.07.30

I’m running dynamo to a Windows platform(which is running the same windows version of Iometer) which is running a 1.6Ghz processor

with 4Gb ram.

 

I run a set of tests, of which sequential writes/reads seem to work just fine.  My problem is when I run the Random write tests I get zeros in the results.   I can see that the disk is being written to but no results are showing on iometer, nor in the results file. (only a little cpu shows up).  The two tests I run are a Random Write throughput test and a Random Write Response time test.  The Random Write Response time test seems to work only on the initial time(and I’m not certain of this since I’d have to have multiple to see consistency!)…any subsequent times(even after stopping and restarting both sides and deleting the file) I get this zero result.  Random Read tests work fine!   I tried running this on two different windows machines and another Linux machine with the same results.  I also tried running using only IP addresses just to make certain DNS wasn’t screwing up anything.  Before going forward and downloading the common src in order to rebuild with debug I wanted to find out a) has anyone else seen this? B) does anyone have any clues as to what I can do to get to the bottom of this!?
Thanks,
Kate

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Re: Dynamo on Linux: Random Write issues

Ming Zhang
On Mon, 2005-09-12 at 16:05 -0400, Coyne, Kate wrote:

> Hello,
>
>  I am running on this configuration:
>
>             Linux 2.6.9-15.ELsmp #1 SMP Fri Aug 5 19:02:59 EDT 2005
> i686 i686 i386 GNU/Linux
>
> on a Dell2650(Intel(R) Xeon(TM) CPU 2.40GHz twin hyperthreaded with
> only 512MB Ram(I am trying to use as little cache as possible).
>
> Glibc is 2.3.4-2.12.
>
>  
>
> I downloaded Iometer i386 prebuild binary version down to my system.
> Version 2004.07.30
>
> I’m running dynamo to a Windows platform(which is running the same
> windows version of Iometer) which is running a 1.6Ghz processor
>
> with 4Gb ram.
>
>  

no. i have not seen this before. can u try the 07.30DS2 version?

if still has this issue, i guess u need to dl source and enable DEBUG.

Thanks.

>
> I run a set of tests, of which sequential writes/reads seem to work
> just fine.  My problem is when I run the Random write tests I get
> zeros in the results.   I can see that the disk is being written to
> but no results are showing on iometer, nor in the results file. (only
> a little cpu shows up).  The two tests I run are a Random Write
> throughput test and a Random Write Response time test.  The Random
> Write Response time test seems to work only on the initial time(and
> I’m not certain of this since I’d have to have multiple to see
> consistency!)…any subsequent times(even after stopping and restarting
> both sides and deleting the file) I get this zero result.  Random Read
> tests work fine!   I tried running this on two different windows
> machines and another Linux machine with the same results.  I also
> tried running using only IP addresses just to make certain DNS wasn’t
> screwing up anything.  Before going forward and downloading the common
> src in order to rebuild with debug I wanted to find out a) has anyone
> else seen this? B) does anyone have any clues as to what I can do to
> get to the bottom of this!?
> Thanks,
> Kate
>
>



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