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20 THE CI PROGRAM 159<br />

IKCPS=2:<br />

IOPTGM:<br />

IOPTGM=0:<br />

K(CP) and K(CP’) are calculated. Default is IKCPS=2 except<br />

when single reference configuration, when IKCPS=1.<br />

Option for density matrix routines.<br />

all quantities in density matrix routines are recalculated for<br />

each intermediate symmetry (max. CPU, min. core).<br />

IOPTGM=1: quantities precalculated and stored on disk (max. I/O, min.<br />

core).<br />

IOPTGM=2: quantities precalculated and kept in core (min. CPU, max.<br />

core).<br />

IOPTOR:<br />

If nonzero, calculate intermediate orbitals for each pair. Might<br />

improve convergence in some cases, in particular if localized<br />

orbitals are used.<br />

20.3.18 Miscellaneous parameters<br />

PARAM,code1=value,code2=value...<br />

Redefine system parameters. If no codes are specified, the default values are displayed. The<br />

following codes are allowed:<br />

LSEG:<br />

INTREL:<br />

IVECT=0:<br />

IVECT=1:<br />

MINVEC:<br />

IBANK:<br />

LTRACK:<br />

LTR:<br />

NCPUS:<br />

disc sector length<br />

number of integers per REAL*8 word<br />

scalar machine<br />

vector machine<br />

call MXMB in coupling coefficient routines if vector length<br />

larger than this value.<br />

number of memory banks for vector machines. If IBANK>1,<br />

vector strides which are multiples of IBANK are avoided where<br />

appropriate.<br />

number of REAL*8 words per track or block (for file allocation)<br />

determines how matrices are stored on disc. If LTR=LSEG, all<br />

matrices start at sector boundaries (which optimizes I/O), but<br />

unused space is between matrices (both on disc and in core).<br />

With LTR=1 all matrices are stored dense. This might increase<br />

I/O if much paging is necessary, but reduce I/O if everything<br />

fits in core.<br />

Maximum number of CPUs to be used in multitasking.<br />

20.4 Miscellaneous thresholds<br />

THRESH,code1=value,code2=value...<br />

If value=0, the corresponding threshold is set to zero, otherwise 10**(-value). The equal signs<br />

may be omitted. If no codes are specified, the default values are printed. The following codes<br />

are allowed (max 7 per card):

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