Author: Robert Hyatt
Date: 08:31:04 08/15/05
Go up one level in this thread
On August 15, 2005 at 11:08:01, Mathieu Pagé wrote:
>>I believe the only difference is that the chip you are looking at can not be
>>used in a dual processor or better. That is, it is a single-cpu only and can't
>>be used in a dual or quad MB. I assume the cache doesn't have the NUMA cache
>>coherency stuff which makes multiple cpus impossible to use.
>
>Hi Dr Hyatt,
>
>After your last message I make some internet search and it seems that Athlon 64
>are effectively similar to Opteron, except the fact that they can not be used in
> a dual configuration.
>
>So you are maintaining that this thing is twice as fast as an Xeon 2.8ghz ?
absolutely. Here is some data. I'm going to use one cpu on my xeon 2.8ghz box
to search kopec position 22 to 14 plies... Then I'll do the same on a single
opteron CPU. First the xeon:
14 52.77 -0.31 1. ... Bxe4 2. Bxe4 Qxc4 3. Qxc4 Rxc4
4. Nxb6 Nxb6 5. Bd3 Rc7 6. Nd4 Rd7
7. Nc6 a4 8. Bd4 Nfd5
14-> 1:35 -0.31 1. ... Bxe4 2. Bxe4 Qxc4 3. Qxc4 Rxc4
4. Nxb6 Nxb6 5. Bd3 Rc7 6. Nd4 Rd7
7. Nc6 a4 8. Bd4 Nfd5
and then the opteron:
14 26.58 -0.31 1. ... Bxe4 2. Bxe4 Qxc4 3. Qxc4 Rxc4
4. Nxb6 Nxb6 5. Bd3 Rc7 6. Nd4 Rd7
7. Nc6 a4 8. Bd4 Nfd5
14-> 43.28 -0.31 1. ... Bxe4 2. Bxe4 Qxc4 3. Qxc4 Rxc4
4. Nxb6 Nxb6 5. Bd3 Rc7 6. Nd4 Rd7
7. Nc6 a4 8. Bd4 Nfd5
So, 95 / 43.28 = 2.19X faster.
Note that this is a 2.2ghz opteron, not 2.4, the 2.4 will be 10% faster still.
Also note that this is a 32 bit version of crafty on the xeon (the xeon is a 32
bit architecture) vs a 64 bit version of crafty on the opteron.
there is simply no comparison...
>
>btw I just saw you beat Diep, congratulations. I wonder how you manage that, I
>mean aren't you playing remotely? Unbelivable!
Yes. Remotely, on a NUMA architecture with a program that knows nothing about
NUMA, and on a parallel NUMA box with 8 cpus with a program that won't scale to
8 cpus...
amazing...
:)
>
>Mathieu Pagé
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