Joe,
Thanks for the link. Based on that, they should be pretty close in
performance, and mine are not, so I must be doing something wrong with
my OpenBLAS build. Since ACML is dead, I was hoping I could use OpenBLAS
moving forward.
Prentice
On 02/22/2018 06:01 PM, Joe Landman wrote:
ACML is hand coded assembly. Not likely that OpenBLAS will be much
better. Could be similar. c.f.
http://gcdart.blogspot.co.uk/2013/06/fast-matrix-multiply-and-ml.html
On 02/22/2018 05:48 PM, Prentice Bisbal wrote:
Just rebuilt OpenBLAS 0.2.20 locally on the test system with GCC
6.1.0, and I'm only getting 91 GFLOPS. I'm pretty sure OpenBLAS
performance should be close to ACML performance, if not better. I'll
have to dig into this later. For now, I'm going to continue my
testing using the ACML-based build and revisit the OpenBLAS
performance later.
Prentice
On 02/22/2018 05:27 PM, Prentice Bisbal wrote:
So I just rebuilt HPL using the ACML 6.1.0 libraries with GCC 6.1.0,
and I'm now getting 197 GFLOPS, so clearly there's a problem with my
OpenBLAS build. I'm going to try building OpenBLAS without the
dynamic arch support on the machine where I plan on running my
tests, and see if that version of the library is any better.
Prentice
On 02/22/2018 09:37 AM, Prentice Bisbal wrote:
Beowulfers,
In your experience, how close does actual performance of your
processors match up to their theoretical performance? I'm
investigating a performances issue on some of my nodes. These are
older systems using AMD Opteron 6274 processors. I found literature
from AMD stating the theoretical performance of these processors is
282 GFLOPS, and my LINPACK performance isn't coming close to that
(I get approximately ~33% of that). The number I often hear
mentioned is actual performance should be ~85%. of theoretical
performance is that a realistic number your experience?
I don't want this to be a discussion of what could be wrong at this
point, we will get to that in future posts, I assure you!
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