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Force User's Manual A Portable Parallel Fortran

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4.2.3 Size and Alignment of Data Types

Storage and alignmentare always given in bytes. Values that can fit into a single byte are byte-aligned.

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Force User's Manual A Portable Parallel Fortran Download

For large-scale finite element based structural analysis, an out-of-core equation solver is often required since the in-core memory of a computer is very limited. For example, the Cray Y-MP has only. The use of Force, a parallel, portable FORTRAN on shared memory parallel computers is described. Force simplifies writing code for parallel computers and, once the parallel code is written, it is. The manual is an update of Users Manual for Hydrological Simulation Program—FORTRAN (HSPF). This report was submitted impartial fulfillment of Contract No. 68-01- 6207 by Linsley, Kraeger Associates, Ltd., and Anderson-Nichols and Co. Under the sponsorship of the U.S. Environmental Protection Agency.

The size and alignment of types depends on various compiler optionsand platforms, and how variables are declared. The default maximum alignmentin COMMON blocks is to 4-byte boundaries.

Default data alignment and storage allocation can be changed by compiling with specialoptions, such as -aligncommon, -f, -dalign,-dbl_align_all,- xmemalign, and- xtypemap.The default descriptions in this manual assume that these options are not in force.

Force User's Manual A Portable Parallel Fortran 1

There is additional information in the Fortran ProgrammingGuide regarding special cases of data types and alignment on certainplatforms.

The following table summarizes the default size and alignment, ignoringother aspects of types and options.

Table 4-3
BYTE X
CHARACTER*nX
1
1
1
1
COMPLEX X
DOUBLE COMPLEX X
COMPLEX*32 X
8
16
4
8
8/16
4
4
DOUBLE PRECISION X
REAL*4 X
REAL*16 X
4
8
8
4
8/16
4
4
INTEGER X
INTEGER*4 X
4
4
4
4
4
4
LOGICAL X
LOGICAL*2 X
LOGICAL*8 X
1
4
4
2
8
1
4
Default Data Sizes and Alignments (in Bytes)

Force User's Manual A Portable Parallel Fortran File

Note the following: Sap accounts receivable report.

Force User's Manual A Portable Parallel Fortran 3

  • REAL*16 and COMPLEX*32: in 64-bit environments(compiling with -m64) the default alignment is on 16-byte (rather than 8-byte)boundaries, as indicated by 8/16 in the table. This data type is often referred to as quadprecision.

  • Arrays and structures align according to their elements orfields. An array aligns the same as the array element. A structure alignsthe same as the field with the widest alignment.

Force User's Manual A Portable Parallel Fortran 2

Options -f or -dalign force alignment of all 8, 16, or32-byte data onto 8-byte boundaries. Option -dbl_align_all causes all data to bealigned on 8-byte boundaries. Programs that depend on the use of these options may not beportable.

Force User's Manual A Portable Parallel Fortran Software

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