iparmq (l) - Linux Man Pages
iparmq: This program sets problem and machine dependent parameters useful for xHSEQR and its subroutines
IPARMQ - This program sets problem and machine dependent parameters useful for xHSEQR and its subroutines
- INTEGER FUNCTION
IPARMQ( ISPEC, NAME, OPTS, N, ILO, IHI, LWORK )
IHI, ILO, ISPEC, LWORK, N
NAME*( * ), OPTS*( * )
This program sets problem and machine dependent parameters
useful for xHSEQR and its subroutines. It is called whenever
ILAENV is called with 12 <= ISPEC <= 16
- ISPEC (input) integer scalar
ISPEC specifies which tunable parameter IPARMQ should
ISPEC=12: (INMIN) Matrices of order nmin or less
are sent directly to xLAHQR, the implicit
double shift QR algorithm. NMIN must be
at least 11.
ISPEC=13: (INWIN) Size of the deflation window.
This is best set greater than or equal to
the number of simultaneous shifts NS.
Larger matrices benefit from larger deflation
ISPEC=14: (INIBL) Determines when to stop nibbling and
invest in an (expensive) multi-shift QR sweep.
If the aggressive early deflation subroutine
finds LD converged eigenvalues from an order
NW deflation window and LD.GT.(NW*NIBBLE)/100,
then the next QR sweep is skipped and early
deflation is applied immediately to the
remaining active diagonal block. Setting
IPARMQ(ISPEC=14) = 0 causes TTQRE to skip a
multi-shift QR sweep whenever early deflation
finds a converged eigenvalue. Setting
IPARMQ(ISPEC=14) greater than or equal to 100
prevents TTQRE from skipping a multi-shift
ISPEC=15: (NSHFTS) The number of simultaneous shifts in
a multi-shift QR iteration.
ISPEC=16: (IACC22) IPARMQ is set to 0, 1 or 2 with the
0: During the multi-shift QR sweep,
xLAQR5 does not accumulate reflections and
does not use matrix-matrix multiply to
update the far-from-diagonal matrix
1: During the multi-shift QR sweep,
xLAQR5 and/or xLAQRaccumulates reflections and uses
matrix-matrix multiply to update the
far-from-diagonal matrix entries.
2: During the multi-shift QR sweep.
xLAQR5 accumulates reflections and takes
advantage of 2-by-2 block structure during
(If xTRMM is slower than xGEMM, then
IPARMQ(ISPEC=16)=1 may be more efficient than
IPARMQ(ISPEC=16)=2 despite the greater level of
arithmetic work implied by the latter choice.)
- NAME (input) character string
Name of the calling subroutine
- OPTS (input) character string
This is a concatenation of the string arguments to
- N (input) integer scalar
N is the order of the Hessenberg matrix H.
- ILO (input) INTEGER
IHI (input) INTEGER
It is assumed that H is already upper triangular
in rows and columns 1:ILO-1 and IHI+1:N.
- LWORK (input) integer scalar
The amount of workspace available.
Little is known about how best to choose these parameters.
It is possible to use different values of the parameters
for each of CHSEQR, DHSEQR, SHSEQR and ZHSEQR.
It is probably best to choose different parameters for
different matrices and different parameters at different
times during the iteration, but this has not been
implemented --- yet.
The best choices of most of the parameters depend
in an ill-understood way on the relative execution
rate of xLAQR3 and xLAQR5 and on the nature of each
particular eigenvalue problem. Experiment may be the
only practical way to determine which choices are most
Following is a list of default values supplied by IPARMQ.
These defaults may be adjusted in order to attain better
performance in any particular computational environment.
IPARMQ(ISPEC=12) The xLAHQR vs xLAQR0 crossover point.
Default: 75. (Must be at least 11.)
IPARMQ(ISPEC=13) Recommended deflation window size.
This depends on ILO, IHI and NS, the
number of simultaneous shifts returned
by IPARMQ(ISPEC=15). The default for
(IHI-ILO+1).LE.500 is NS. The default
for (IHI-ILO+1).GT.500 is 3*NS/2.
IPARMQ(ISPEC=14) Nibble crossover point. Default: 14.
IPARMQ(ISPEC=15) Number of simultaneous shifts, NS.
a multi-shift QR iteration.
If IHI-ILO+1 is ...
greater than ...but less ... the
or equal to ... than default is