[Numpy-discussion] Anyone with Core i7 and Ubuntu 10.04?

Ian Goodfellow goodfellow.ian@gmail....
Tue Nov 9 10:51:53 CST 2010


Yes, that's pretty much the situation. I'm mostly looking for someone
who has satisfactory performance with their Core i7 so I can get some
comparison information and figure out if I need to disable
hyperthreading or compile atlas with different flags or what.

Are the Ubuntu 10.10 atlas packages actually different from the Ubuntu
10.04 atlas packages?


Depending on how I install I can get different error messages.
If I install the atlas packages in Ubuntu 10.04 I get slow performance
relative to other Core i7 or even Core 2 Quad machines with lower
clock rates that are available to me at work.
If I compile my own atlas and try to build numpy with site.cfg I get
one set of error messages that I've sent to the list before.
If I compile my own atlas and try to build numpy with environment
variables specifying the location of ATLAS, the environment variables
get ignored and it is built without atlas.
If I compile my own atlas and put symlinks to it in the default search
places, I get numpy libraries that ldd shows as linking to atlas but
still get slow peformance.




On Mon, Nov 8, 2010 at 11:33 PM, David Warde-Farley
<wardefar@iro.umontreal.ca> wrote:
> On 2010-11-08, at 8:52 PM, David wrote:
>
>> Please tell us what error you got - saying that something did not
>> working is really not useful to help you. You need to say exactly what
>> fails, and which steps you followed before that failure.
>
> I think what he means is that it's very slow, there's no discernable error but dot-multiplies don't seem to be using BLAS.
>
> David
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