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From: Dave Cramer <pg@fastcrypt.com>
To: Justin <justin@emproshunts.com>
Cc: Craig James <craig_james@emolecules.com>
Cc: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Benchmark: Dell/Perc 6, 8 disk RAID 10
Date: Mon, 17 Mar 2008 14:12:03 -0400
Message-ID: <B18EFFDB-D930-47AB-A0BF-2A4AAF1C4765@fastcrypt.com> (raw)
In-Reply-To: <47DEBD7C.2060204@emproshunts.com>
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	<47D00DB2.7040007@emolecules.com>
	<18451.1204824562@sss.pgh.pa.us>
	<47D0AFC1.5070305@emolecules.com>
	<08115901408538@mail.emproshunts.com>
	<47D93A43.6020503@emolecules.com>
	<016301c8854e$851e06e0$3101a8c0@JDell>
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	<47DA1866.3050500@krogh.cc>
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	<47DA37E1.6050104@emproshunts.com>
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	<47DA5852.30004@emproshunts.com>
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	<F38ADB71-8F77-41C8-9066-488FFCA7BD67@fastcrypt.com>
	<47DD6F4C.2050208@emolecules.com>
	<47DEBD7C.2060204@emproshunts.com>


On 17-Mar-08, at 2:50 PM, Justin wrote:

>
>>
>> Just out of curiosity: Last time I did research, the word seemed to  
>> be that xfs was better than ext2 or ext3.  Is that not true?  Why  
>> use ext2/3 at all if xfs is faster for Postgres?
>>
>> Criag
>
> Ext2 vs XFS on my setup there is difference in the performance  
> between the two file systems but its not OMG let switch.   XFS did  
> better then Ext2 only one time, then Ext2 won out by small margin at  
> best was 6%.   the other test ran at 3 to 4% better than XFS  
> performance.
>
> XFS has journaling so it should be safer.  I think i may stick with  
> XFS as it has journaling
>
> One thing i think is clear don't use ext3  it just kills performance  
> by factors not small percents
>
> here is article i found on XFS http://linux-xfs.sgi.com/projects/xfs/papers/xfs_white/xfs_white_paper.html
>
> I hope this is helpful to people.  I know the process has taught me  
> new things, and thanks to those that helped me out.
>
> Before i throw this sever into production any one else want  
> performance numbers.
>
> C:\Program Files\PostgreSQL\8.3\bin>pgbench -c 10 -t 40000 -v -h  
> 192.168.1.9 -U
> postgres play
> Password:
> starting vacuum...end.
> starting vacuum accounts...end.
> transaction type: TPC-B (sort of)
> scaling factor: 100
> number of clients: 10
> number of transactions per client: 40000
> number of transactions actually processed: 400000/400000
> tps = 2181.512770 (including connections establishing)
> tps = 2187.107004 (excluding connections establishing)
>


2000 tps ??? do you have fsync turned off ?

Dave




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