On 20 Oct 2001, at 9:44, Mikus Grinbergs wrote:
> Interesting to compare the performance numbers given for the Itanium
> running Glucas v2.8c against my Thunderbird running mprime v21.4 :
>
> - At the smallest FFT length, the Itanium is WAY faster.
Probably a "large cache" effect.
>
>
Hi again,
I forgot to comment an observation made when writing Glucas for Itanium.
IA64 architecture has a very nice feature: predication. In the DWT used in
most GIMPS clients, the normalization and carry phase has a relevant cost in
terms of performance. There some branches hard to predict a
Hi,
> Interesting to compare the performance numbers given for the Itanium
> running Glucas v2.8c against my Thunderbird running mprime v21.4 :
>
AFAIK, mprime v21.4 now uses prefetch hints to avoid idle cycles waiting for
new data. Glucas/Itanium (C-plain code) uses a kind of preload, no prefe
At 09:44 AM 10/20/2001 -0500, Mikus Grinbergs wrote:
> then the performance difference increases until
>
> - At the largest FFT length, the Itanium is noticeably faster
>
>Is it memory-bandwidth that lets the Itanium pull ahead at the
>large FFT lengths ?
Just speculation, it could be the lar
Interesting to compare the performance numbers given for the Itanium
running Glucas v2.8c against my Thunderbird running mprime v21.4 :
- At the smallest FFT length, the Itanium is WAY faster.
this performance difference decreases until
- At FFTs 640K-2048K, the Itanium is a little bi
Hi all,
A new Glucas v.2.8c version has been released. You can download the source
code or precompiled binaries at sourceforge site:
http://sourceforge.net/projects/glucas
and, as slow as a snail alternative at my anonymous ftp server:
ftp://ftp.oxixares.com/pub/glucas/Glucas-
