On May 17, 2:48 am, Bill Hart <[EMAIL PROTECTED]> wrote:
> Hi Martin,
>
> That spike is wierd. Basically I got closer to 2x the time of Magma
> for 16384x16384, but you need different parameters than for
> 10000x10000 or 20000x20000 since the size of the M4R matrices will be
> different than in either of those cases.
>
> For 16384x16384 my notes say that I used k = 6 and BLOCK = 256. One
> might also need to fiddle with the cutoff. I think I used 3600, but at
> various times I had the cutoff set lower.
>
> It would be awfully surprising if there wasn't a set of parameters
> that dropped this time right down. It is possible that the L1 cache is
> smaller on sage.math than on the Opteron I was using. Perhaps my
> parameters don't apply on that machine.
Shouldn't we use an ATLAS like tuning process? [obviously not that
heavy timewise]. It will likely find good default values.
> Bill.
<SNIP>
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