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Re: Some quick Opteron 32-bit/64-bit results

From: Cott Lang <cott(at)internetstaff(dot)com>
To: William Yu <wyu(at)talisys(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Some quick Opteron 32-bit/64-bit results
Date: 2004-11-23 17:20:07
Message-ID: 1101230407.5440.8.camel@localhost (view raw or flat)
Thread:
Lists: pgsql-performance
I ran quite a few file system benchmarks in RHAS x86-64 and FC2 x86-64
on a Sun V40z - I did see very consistent 50% improvements in bonnie++
moving from RHAS to FC2 with ext2/ext3 on SAN.



On Sun, 2004-11-14 at 23:51 -0800, William Yu wrote:
> Greg Stark wrote:
> > William Yu <wyu(at)talisys(dot)com> writes:
> > 
> > 
> >>Biggest speedup I've found yet is the backup process (PG_DUMP --> GZIP). 100%
> >>faster in 64-bit mode. This drastic speed might be more the result of 64-bit
> >>GZIP though as I've seen benchmarks in the past showing encryption/compression
> >>running 2 or 3 times faster in 64-bit mode versus 32-bit.
> > 
> > 
> > Isn't this a major kernel bump too? So a different scheduler, different IO
> > scheduler, etc?
> > 
> 
> I'm sure there's some speedup due to the kernel bump. I really didn't 
> have the patience to even burn the FC2 32-bit CDs much less install both 
> 32-bit & 64-bit FC2 in order to have a more accurate baseline comparison.
> 
> However, that being said -- when you see huge speed increases like 50% 
> 100% for dump+gzip, it's doubtful the kernel/process scheduler/IO 
> scheduler could have made that drastic of a difference. Maybe somebody 
> else who has done a 2.4 -> 2.6 upgrade can give us a baseline to 
> subtract from my numbers.
> 
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