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Subject: Re: Question re dual processor differences.

Author: Robert Hyatt

Date: 18:02:33 01/31/03

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On January 31, 2003 at 14:45:30, Matt Taylor wrote:

>On January 31, 2003 at 13:31:59, Robert Hyatt wrote:
>
>>On January 31, 2003 at 02:49:03, Matt Taylor wrote:
>>
>>>On January 30, 2003 at 14:24:27, Robert Hyatt wrote:
>>>
>>>>On January 30, 2003 at 13:28:42, Christopher A. Morgan wrote:
>>>>
>>>>>Question re dual processor differences.
>>>>>
>>>>>Tiger Direct offers a dual AMD MP 2200+ for $1,650, and a dual Intel Xeon 2.4
>>>>>for $3,000.  Both without an operating system.
>>>>>
>>>>>What difference in performance would I expect between these two machines?  The
>>>>>AMD dual at roughly ½ the price seems to be the much better buy, although the
>>>>>Xeon should have HT, I believe?
>>>>>
>>>>>For a Windows operating system which is better (I am a single user, no network
>>>>>use, no server use), Win XP Pro or Win 2000 Pro?
>>>>>
>>>>>Thanks!
>>>>
>>>>
>>>>there are plenty of people here that can give you a good performance comparison
>>>>between the two.  From what I have seen, AMD generally has the performance edge
>>>>until you step into the dual market. Then you have to be very careful as several
>>>>AMD
>>>>tests posted here by others (not by me as I have no AMD boxes here at all)
>>>>suggest that
>>>>the AMD duals have a memory bottleneck that limits performance.  However, it is
>>>>also likely that there are both good and bad chipsets for supporting duals.
>>>>Intel has
>>>>a "workstation" class dual xeon chipset and a "server" class chipset.  The
>>>>server class
>>>>chipset has better memory performance.
>>>>
>>>>It it were _my_ money, I would benchmark the program(s) I want to run on the box
>>>>before making the decision.  As I said, there are certainly bad AMD chipsets for
>>>>duals.  There are _also_ bad Intel chipsets for duals.
>>>>
>>>>Common sense says "benchmark" or get data directly from someone that has the
>>>>_specific_ chipset you are looking at.
>>>>
>>>>All duals are not created equal.  Hyper-threading is yet another issue.
>>>>Remember
>>>>that you have to run two threads to take full advantage of one physical CPU.  On
>>>>AMD
>>>>this is not true.  Hyper-threading speeds things up significantly.  But that
>>>>second thread
>>>>also has a cost, particularly if you don't have a second thread to run. :)
>>>
>>>There are only 2 dual-CPU chipsets for Socket A. They are the AMD 760 and AMD
>>>760MPX. Both of my duals are based on the 760MPX. There may be performance
>>>difference; the only listed difference I could find was the memory footprint.
>>>
>>>I posted my numbers a while back. My AthlonMP 2000 system had something like 1.5
>>>MN/sec. My AthlonMP 1600 had something like 1.1 MN/sec. IIRC, your dual Xeon 2.8
>>>GHz was ~2.1 MN/sec, yes? Extrapolating to AthlonMP 2400, it would not quite
>>>match 2.1 MN/sec, though it would be close and -much- cheaper.
>>>
>>>Just like you, I believe the issue is a memory bottleneck. The SMP chipset
>>>squanders valuable bus cycles. Intel's chipsets use interleaving to give each
>>>processor "dedicated" bandwidth.
>>>
>>>-Matt
>>
>>the 2.1M depends on the test set, of course.  And other things as well.  I
>>really hate to
>>compare even Crafty NPS numbers across machines, unless it is done one very
>>specific
>>way:
>>
>>default settings on _everything_, except for the mt=N to enable extra cpus, and
>>using the
>>"bench" command.  That makes sure everyone runs the same positions, with the
>>same size
>>hash, and it needs to be the _same_ version of Crafty as there is variance
>>between versions
>>for lots of reasons.
>>
>>I'll try to run the bench test.  OK just did.
>>
>>2.134M nodes per second (2,134K nodes per second if you prefer K).  That is run
>>using
>>the intel compiler in feedback optimizer mode, dual 2.8 xeon with mt=4 and
>>hyperthreading
>>on...
>>
>>Bob
>
>I also ran with default settings. Fired up Crafy, set mt=2, ran the bench test.
>I did run a different version, but that shouldn't make a huge difference in nps,
>should it? I ran Aaron Gordon's 18.11 optimized version on both machines.
>
>When I get some time, I would like to pour through Crafty code and work on
>optimizing it for Athlon. I have just not had that time lately...
>
>-Matt


Suggestions are _always_ welcome.

:)




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