On 5/13/09 11:21 PM, "Arjen van der Meijden"
wrote:
> On 13-5-2009 20:39 Scott Carey wrote:
>> Excellent! That is a pretty huge boost. I'm curious which aspects of this
>> new architecture helped the most. For Postgres, the following would seem
>> the most relevant:
>> 1. Shared L3 cache pe
On 5/13/09 11:52 PM, "Greg Smith" wrote:
> On Wed, 13 May 2009, Scott Carey wrote:
>
>> Can you do a quick and dirty memory bandwidth test? (assuming linux)
>>
>> /sbin/hdparm -T /dev/sd
>>
>> ...its not a very accurate measurement, but its quick and highlights
>> relative hardware difference
On Wed, 13 May 2009, Scott Carey wrote:
Can you do a quick and dirty memory bandwidth test? (assuming linux)
/sbin/hdparm -T /dev/sd
...its not a very accurate measurement, but its quick and highlights
relative hardware differences very easily.
I've found "hdparm -T" to be useful for compar
On 13-5-2009 20:39 Scott Carey wrote:
Excellent! That is a pretty huge boost. I'm curious which aspects of this
new architecture helped the most. For Postgres, the following would seem
the most relevant:
1. Shared L3 cache per processors -- more efficient shared datastructure
access.
2. Fas
FYI:
This is an excellent article on the Nehalem CPU's and their memory
performance as the CPU and RAM combinations change:
http://blogs.sun.com/jnerl/entry/configuring_and_optimizing_intel_xeon
Its fairly complicated (as it is for the Opteron too).
On 5/13/09 9:58 AM, "Scott Carey" wrote:
>
On 5/12/09 11:08 PM, "Arjen van der Meijden"
wrote:
> We have a dual E5540 with 16GB (I think 1066Mhz) memory here, but no AMD
> Shanghai. We haven't done PostgreSQL benchmarks yet, but given the
> previous experiences, PostgreSQL should be equally faster compared to mysql.
>
> Our databasebenc
On 5/12/09 10:06 PM, "Scott Marlowe" wrote:
> Just realized I made a mistake, I was under the impression that
> Shanghai CPUs had 8xxx numbers while barcelona had 23xx numbers. I
> was wrong, it appears the 8xxx numbers are for 4+ socket servers while
> the 23xx numbers are for 2 or fewer sock
We have a dual E5540 with 16GB (I think 1066Mhz) memory here, but no AMD
Shanghai. We haven't done PostgreSQL benchmarks yet, but given the
previous experiences, PostgreSQL should be equally faster compared to mysql.
Our databasebenchmark is actually mostly a cpu/memory-benchmark.
Comparing th
Just realized I made a mistake, I was under the impression that
Shanghai CPUs had 8xxx numbers while barcelona had 23xx numbers. I
was wrong, it appears the 8xxx numbers are for 4+ socket servers while
the 23xx numbers are for 2 or fewer sockets. So, there are several
quite affordable shanghai cp
On Tue, May 12, 2009 at 8:59 PM, Scott Carey wrote:
> The $ cost of more CPU power on larger machines ends up such a small %
> chunk, especially after I/O cost. Sure, the CPU with HyperThreading and the
> turbo might be 40% more expensive than the other CPU, but if the total
> system cost is 5% m
The $ cost of more CPU power on larger machines ends up such a small %
chunk, especially after I/O cost. Sure, the CPU with HyperThreading and the
turbo might be 40% more expensive than the other CPU, but if the total
system cost is 5% more for 15% more performance . . .
It depends on how CPU lim
On Tue, May 12, 2009 at 8:05 PM, Greg Smith wrote:
> Anand did SQL Server and Oracle test results, the Nehalem system looks like
> a substantial improvement over the Shanghai Opteron 2384:
>
> http://it.anandtech.com/IT/showdoc.aspx?i=3536&p=6
> http://it.anandtech.com/IT/showdoc.aspx?i=3536&p=7
Anand did SQL Server and Oracle test results, the Nehalem system looks
like a substantial improvement over the Shanghai Opteron 2384:
http://it.anandtech.com/IT/showdoc.aspx?i=3536&p=6
http://it.anandtech.com/IT/showdoc.aspx?i=3536&p=7
--
* Greg Smith gsm...@gregsmith.com http://www.gregsmith.c
Anyone on the list had a chance to benchmark the Nehalem's yet? I'm
primarily wondering if their promise of performance from 3 memory
channels holds up under typical pgsql workloads. I've been really
happy with the behavior of my AMD shanghai based server under heavy
loads, but if the Nehalems mu
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