hard-sector 5 1/4 disk

From: Carlos Murillo <cmurillo_at_emtelsa.multi.net.co>
Date: Mon Nov 5 19:17:05 2001

At 05:12 PM 11/5/01 -0500, you wrote:
>> What I would like to see is a LAPACK library that makes full use of the
G4's
>> vector processing capability--it should bring any pentium of any speed to
>> its knees in numerical linear algebra applications. Is there any such
beast
>> around? Of the non-commercial variety?
>
>Is LAPACK like LINPACK for PCs?
>
>-dq

No, it is the desdendant of it; in its latest reincarnation, for
example, all inner routines were recoded to take advantage of the
fact that in modern systems cache hit ratio pretty much determines what
the final speed will be. Tests are made to find out the optimal inner
buffer size (i.e. cache) and routines then use optimal data block sizes
for the cache size. IT used to be Eispack (yes, the scope was much
narrower for this one). Then Linpack. Now IT is Lapack, at least for dense
systems; for sparse numerical linear algebra, there is a plethora of packages.

Matlab challenge question: what does the dongarra(n) function compute?
This is an undocumented function in matlab. (Jack Dongarra has been one of
the pivotal personalities behind these public domain numerical linear
algebra packages).


--------------------------------------------------------------
Carlos E. Murillo-Sanchez carlos_murillo_at_nospammers.ieee.org
Received on Mon Nov 05 2001 - 19:17:05 GMT