ViewVC logotype

Log of /MITgcm/verification/exp2/input/topog-z

Parent Directory Parent Directory | Revision Log Revision Log | View Revision Graph Revision Graph

Links to HEAD: (view) (download) (annotate)
Links to MAIN: (view) (download) (annotate)
Sticky Tag:

Revision 1.2
Wed May 5 18:32:38 1999 UTC (22 years, 1 month ago) by adcroft
Branch: MAIN
Changes since 1.1: +0 -0 lines
Implemented new I/O package (mdsio.F). This package does parallel
I/O in much the same way as dfile.F used to except it uses "direct
access" rather than (f77) unformatted sequential access.

Problems with dfile.F package included:
  o unnecessary memory use (each process had two global sized buffers)
  o inability to read the files it had written without post-processing
  o "tiled" files were tiled by process/thread rather than actual tiles
  o created huge numbers of files with no alternatives

Features of the mdsio.F package:
  o direct-access binary writes
  o no excessive memory use
  o ability to read/write from multiple record files
  o "tiled" files are based on "WRAPPER" tiles so that the number
    and content of files is independent of the number of threads
    and/or processes
  o option to create single "global" files rather than "tiled" files
  o ability to read both "global" and "tiled" files
    [Caveat: the tiling of files must match the model tiles]
  o checkpoints now use a single file per model section
    ie.  one file for the hydrostatic model core, one file
    for the non-hydrostatic extensions and one file for the C-D
  o the mid-level I/O routines now is broken into more source files
    read_write_fld.F supplies basic I/O routines with the same interface
                     as the original I/O package
    read_write_rec.F supplies I/O routines which allow multiple records
    write_state.F    writes the model state
    checkpoint.F     supplies the read/write checkpoint routines

All the example input data has had to be modified to be direct-access.
Otherwise only routines that used I/O have been affected and not
all of those have been due to the continuity of arguments in
the read_write_fld.F routines.

What needs to be done?  We have to create a suite of conversion
utilities for users with old-style data. Also supply the option
for using old-style I/O, not just for die-hards but for reading
data too extensive to be converted. And more...

Revision 1.1 - (view) (download) (annotate) - [selected]
Mon Dec 14 23:59:59 1998 UTC (22 years, 6 months ago) by adcroft
Branch: MAIN
CVS Tags: checkpoint19, checkpoint20
Restructuring verification experiments.

This form allows you to request diffs between any two revisions of this file. For each of the two "sides" of the diff, select a symbolic revision name using the selection box, or choose 'Use Text Field' and enter a numeric revision.

  Diffs between and
  Type of Diff should be a

Sort log by:

  ViewVC Help
Powered by ViewVC 1.1.22