D.5.3. FMS Matrix File Parameter NEQBIO

Data Type

Integer

Units

Equations

Default Value

0 = determined by FMS in subroutine RSDI, RNDI, CHDI, CSDI, CNDI
Block and Slab matrices only (MFMAT=2 or 3).

Description

This is the block size used for storing the off-diagonal matrix data in [AL] and [AU] on files LUA(1) and LUA(3) for Block and Slab matrices. The record size on files LUA(1) and LUS(3) in REAL*8 (8-byte) words will be approximately

   (record size) = IDTYPE*NEQBIO*NEQBIO

where IDTYPE is 1 for REAL*8 data and 2 for COMPLEX*16 data.

When FMS selects this value, the following factors are considered:

The amount of memory available in the FMS memory pool
The compute block dimension NEQBLK
The number of CPU processing cores MAXCPU
The number of GPUs MAXGPU
The GPU chunk size ICHUNK
The file location INCORE
Optional processing algorithms IAGOR
The minimum unit of address for the disk LSECTR
The number of stripes per record, as specified by NUMIOQ and NUMSTP

If you change the default value of NEQBIO, FMS may change the value you specify if it determines that your specified value would not allow processing to complete.

If you are creating permanent matrix files in different jobs that you later want to process together, you may need to set NEQBIO so all files will have compatible data storage.