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Re: AMD Phenom: phenomenally slow
by Clint Whaley
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Dean,
>> Guys,
>>
>> I just got my hands on a Phenom X4. My understanding was this was the desktop
>> version of the 3rd gen opteron (K10h). I expected it to have the same FPU
>> peak: 4 flops/cycle double SSE, 8 flops/cycle single SSE, 2 flops/cycle x87.
>>
>> However, all my tests indicate it is 2/4/1 (I installed the Goto BLAS as well,
>> and they also run at 1/2 speed compared to opteron). The Athlon-64 was 2/4/2,
>> so it appears to be much crappier than the previous generation hardware.
>> Does anyone have any insight here? The AMD techdocs all lead me to believe
>> 4/8/x (no mention of x87, so crippling that is not as suprising).
>
>in your notation i'm getting 4/8/2 from my 9600 ... that's a pretty weird
>problem you've got there!
OK, making progress then! So, your Phenom 9600 can do more than 2 flops/cycle
in double precision? Have you installed ATLAS on the machine, and if so
can you post your "make time"?
On my machine, I have installed ATLAS, ACML, and Goto BLAS, and all post the
2/4/x numbers.
I was beginning to believe the machine really had 2/4/1, based on the fact
I sent in an AMD tech help request two days ago and still had not recieved
an answer . . .
I guess I will try updating my BIOS, as its about the only thing I can imagine
having this weird affect.
Thanks,
Clint
**************************************************************************
** R. Clint Whaley, PhD ** Assist Prof, UTSA ** www.cs.utsa.edu/~whaley **
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>> Guys,
>>
>> I just got my hands on a Phenom X4. My understanding was this was the desktop
>> version of the 3rd gen opteron (K10h). I expected it to have the same FPU
>> peak: 4 flops/cycle double SSE, 8 flops/cycle single SSE, 2 flops/cycle x87.
>>
>> However, all my tests indicate it is 2/4/1 (I installed the Goto BLAS as well,
>> and they also run at 1/2 speed compared to opteron). The Athlon-64 was 2/4/2,
>> so it appears to be much crappier than the previous generation hardware.
>> Does anyone have any insight here? The AMD techdocs all lead me to believe
>> 4/8/x (no mention of x87, so crippling that is not as suprising).
>
>in your notation i'm getting 4/8/2 from my 9600 ... that's a pretty weird
>problem you've got there!
OK, making progress then! So, your Phenom 9600 can do more than 2 flops/cycle
in double precision? Have you installed ATLAS on the machine, and if so
can you post your "make time"?
On my machine, I have installed ATLAS, ACML, and Goto BLAS, and all post the
2/4/x numbers.
I was beginning to believe the machine really had 2/4/1, based on the fact
I sent in an AMD tech help request two days ago and still had not recieved
an answer . . .
I guess I will try updating my BIOS, as its about the only thing I can imagine
having this weird affect.
Thanks,
Clint
**************************************************************************
** R. Clint Whaley, PhD ** Assist Prof, UTSA ** www.cs.utsa.edu/~whaley **
**************************************************************************
-------------------------------------------------------------------------
Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW!
Studies have shown that voting for your favorite open source project,
along with a healthy diet, reduces your potential for chronic lameness
and boredom. Vote Now at http://www.sourceforge.net/community/cca08
_______________________________________________
Math-atlas-devel mailing list
Math-atlas-devel@...
https://lists.sourceforge.net/lists/listinfo/math-atlas-devel
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