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<H1><A NAME="SECTION04550000000000000000">Performance of Banded and Out-of-Core Drivers</A></H1>
<P>
ScaLAPACK provides
<I>LU</I> and Cholesky
factorizations for
band matrices. For
small bandwidth,
divide and conquer 
algorithms have
been chosen 
even though they require more 
floating-point operations.
A 
more detailed
performance 
analysis can 
be found in
[<A HREF="node189.html#blackford96a">18</A>].
<P>
ScaLAPACK also provides
prototype out-of-core
linear system
solvers.
Information
on these particular
routines as well
as the algorithms
that have been 
selected can be
found in [<A HREF="node189.html#lawn110">47</A>, <A HREF="node189.html#lawn118">55</A>, <A HREF="node189.html#blackford96a">18</A>].
In particular, it is
shown in [<A HREF="node189.html#lawn118">55</A>]
that these out-of-core
solvers incur approximately
a 20% overhead over the 
corresponding in-core
ScaLAPACK solvers.
<P>
<BR> <HR>
<P><ADDRESS>
<I>Susan Blackford <BR>
Tue May 13 09:21:01 EDT 1997</I>
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