Difference between revisions of "Main Page/PIO"
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Here param(103) = 1 and param(103) = 2 mean it's using Fortran I/O library to write binary and ASCII files, param(103) = 3 means it's using C-POSIX I/O libraries to write binary files. These two approaches would produce one file per processor and we will refer them as "old libraries". | Here param(103) = 1 and param(103) = 2 mean it's using Fortran I/O library to write binary and ASCII files, param(103) = 3 means it's using C-POSIX I/O libraries to write binary files. These two approaches would produce one file per processor and we will refer them as "old libraries". | ||
| − | param(103) = 4 is N1 binary case, | + | param(103) = 4 is N1 binary case, |
| + | |||
param(103) = 5 is NM binary case, | param(103) = 5 is NM binary case, | ||
| + | |||
param(103) = 6 is NM1 binary case, | param(103) = 6 is NM1 binary case, | ||
param(103) = 8 is NMM binary case; | param(103) = 8 is NMM binary case; | ||
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Notice that param(82) and param(83) need to be set correctly in *.rea file. | Notice that param(82) and param(83) need to be set correctly in *.rea file. | ||
| + | |||
param(82) = number of groups, param(83) = max number of fields we are going to write. | param(82) = number of groups, param(83) = max number of fields we are going to write. | ||
Revision as of 01:57, 22 September 2010
This is the document page for parallel I/O library developed in summer 2010 by Jing Fu and Misun Min.
Usage Introduction:
Generally, several new parallel I/O approaches were developed, namely #3, 4, 5, 6, 7, 8. These numbers were used to indicate which I/O to use, in .rea file for a specific example, by parameter 103.
Here param(103) = 1 and param(103) = 2 mean it's using Fortran I/O library to write binary and ASCII files, param(103) = 3 means it's using C-POSIX I/O libraries to write binary files. These two approaches would produce one file per processor and we will refer them as "old libraries".
param(103) = 4 is N1 binary case,
param(103) = 5 is NM binary case,
param(103) = 6 is NM1 binary case, param(103) = 8 is NMM binary case; param(103) = -6 is NM1 ASCII case (in tests it's refered to "7" instead of "-6").
Notice that param(82) and param(83) need to be set correctly in *.rea file.
param(82) = number of groups, param(83) = max number of fields we are going to write.
Implementation Details:
These I/O functions were initiated from cem_out function of cem_dg.F (and cem_dg2.F). Implementation of parallel I/O routine were defined in vtkbin.c and rbIO_nekcem.c, where vtkcommon.c and vtkcommon.h serve as a place to hold common functions as well as global variables.
