Why AMD+parallel got the slowest?

General OpenMP discussion

Re: Why AMD+parallel got the slowest?

Postby baddylover » Sun Oct 07, 2012 2:23 am

Thanks all for the info. Learned a lot. Very Helpful.

As AMD Phenom(tm) II X4 965 Processor and other AMD processors
reported in this thread performed so well -- they performed
as the specified CPU GHz says and the number of cores says,
I'm thinking to buy another AMD computer.

What in my minds now are AMD FX-8150 (3.6GHz/8-core/)
or AMD opteron 6282SE (2.6GHz/16-core/).

FX-8150 is very cheap but has so many bad comments/reviews on it.
I don't care about other things but just scientific, numerical (double precision) computing.
Does FX-8150 work as the specified CPU GHz says and the number of cores says,
as AMD Phenom(tm) II X4 965 Processor does, with openmp and the -O2 compile option?

What about AMD opteron 6282SE (2.6GHz/16-core/)?
I know it's much more expensive and uses a different motherboard.

Please let me know your experience and advice.
baddylover
 
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Joined: Thu Apr 07, 2011 6:17 am

Re: Why AMD+parallel got the slowest?

Postby Oldboy » Tue Nov 06, 2012 3:01 pm

baddylover wrote:Thanks all for the info. Learned a lot. Very Helpful.

What in my minds now are AMD FX-8150 (3.6GHz/8-core/)
or AMD opteron 6282SE (2.6GHz/16-core/).

FX-8150 is very cheap but has so many bad comments/reviews on it.
I don't care about other things but just scientific, numerical (double precision) computing.
Does FX-8150 work as the specified CPU GHz says and the number of cores says,
as AMD Phenom(tm) II X4 965 Processor does, with openmp and the -O2 compile option?

What about AMD opteron 6282SE (2.6GHz/16-core/)?
I know it's much more expensive and uses a different motherboard.

Please let me know your experience and advice.


I have an AMD FX-8120 running on 3100MHz.
It is difficult to "live up to" 8 cores and the best I have seen is around 5.5.
7-zip is doing better than most programs.
You should test the OMP programs on John Burkardt's Home Page.
The Fortran 90 are faster than the C or C++ for floating point and sometimes for integer.
Oldboy
 
Posts: 17
Joined: Wed Oct 31, 2012 2:39 am

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