## General Properties

  Property | Value    | Description
 ----------|----------|------------
 LOGGING   | on/\[off] | enable/disable logging of field input/output
 LOWER\_CASE\_VARIABLE\_NAMES | \[on]/off | Convert all variable names on database to lowercase; replace ' ' with '_'
 VARIABLE\_NAME\_CASE | upper/lower | Convert all variable names on output database to upper or lower case
 USE\_GENERIC\_CANONICAL\_NAMES | on/\[off]  | use `block_{id}` as canonical name of an element block instead of the name (if any) stored on the database. The database name will be an alias.
 ENABLE\_FIELD\_RECOGNITION | \[on]/off | try to combine scalar fields with common basename and recognized suffix into vector, tensor, ...
 FIELD\_SUFFIX\_SEPARATOR  | character \['_'] | use this suffix as separtor between field basename and suffices when recognizing fields
 MINIMIZE\_OPEN\_FILES | on/\[off] | If on, then close file after each timestep and then reopen on next output
 CYCLE\_COUNT | {int}\[infinite] | See `OVERLAY_COUNT` description below
 OVERLAY\_COUNT | {int}\[0] | Output `OVERLAY_COUNT` steps to database on top of each other.  `DB_STEP = (((IOSS_STEP-1) / (OVERLAY_COUNT+1)) % CYCLE_COUNT) +1`
## Auto-Decomposition-Related Properties

 Property        | Value  | Description
-----------------|--------|-----------------------------------------------------------
MODEL\_DECOMPOSITION\_METHOD | {method} | Decompose a DB with type `MODEL` using `method`
RESTART\_DECOMPOSITION\_METHOD | {method} | Decompose a DB with type `RESTART_IN` using `method`
DECOMPOSITION\_METHOD | {method} | Decompose all input DB using `method`
PARALLEL\_CONSISTENCY | \[on]/off | On if the client will call Ioss functions consistently on all processors. If off, then the auto-decomp and auto-join cannot be used.
RETAIN\_FREE\_NODES | \[on]/off | In auto-decomp, will nodes not connected to any elements be retained.
LOAD\_BALANCE\_THRESHOLD | {real} \[1.4] | CGNS-Structured only -- Load imbalance permitted Load on Proc / Avg Load
LINE\_DECOMPOSITION | string | a list of comma-separated BC names. Zone with this bc will not be decomposed perpindicular to this surface. If name is `__ordinal_{ijk}` then use {ijk} as ordinal not to decompose.

### Valid values for Decomposition Method

Method     | Description
------------|-------------------
rcb        | recursive coordinate bisection
rib        | recursive inertial bisection
hsfc       | hilbert space-filling curve
metis\_sfc  | metis space-filling-curve
kway       | metis kway graph-based
kway\_geom  | metis kway graph-based method with geometry speedup
linear     | elements in order first n/p to proc 0, next to proc 1.
cyclic     | elements handed out to id % proc\_count
random     | elements assigned randomly to processors in a way that preserves balance (do not use for a real run)
external   | Files are decomposed externally into a file-per-processor in a parallel run.

## Output File Composition -- Single File output from parallel run instead of file-per-processor

 Property        | Value  | Description
-----------------|--------|-----------------------------------------------------------
COMPOSE\_RESTART  | on/\[off] |
COMPOSE\_RESULTS  | on/\[off] |
PARALLEL\_IO\_MODE | netcdf4, hdf5, pnetcdf | mpiio and mpiposix are deprecated hdf5=netcdf4

## Properties Related to byte size of reals and integers

 Property              | Value  | Description
-----------------------|--------|-----------------------------------------------------------
 INTEGER\_SIZE\_DB       | \[4] / 8 | byte size of integers stored on the database.
 INTEGER\_SIZE\_API      | \[4] / 8 | byte size of integers used in api functions.
 REAL\_SIZE\_DB          | 4 / \[8] | byte size of floating point stored on the database.
 REAL\_SIZE\_API         | 4 / \[8] | byte size of floating point used in api functions.

## Properties related to underlying file type (exodus only)

 Property              | Value  | Description
-----------------------|--------|-----------------------------------------------------------
  FILE\_TYPE            | \[netcdf], netcdf4, netcdf-4, hdf5 |
 COMPRESSION\_LEVEL     | \[0]-9    | In the range \[0..9]. A value of 0 indicates no compression, will automatically set `file_type=netcdf4`, recommend <=4
 COMPRESSION\_SHUFFLE   | on/\[off] |to enable/disable hdf5's shuffle compression algorithm.
 MAXIMUM\_NAME\_LENGTH   | \[32]     | Maximum length of names that will be returned/passed via api call.
 APPEND\_OUTPUT         | on/\[off] | Append output to end of existing output database
 APPEND\_OUTPUT\_AFTER\_STEP | {step}| Max step to read from an input db or a db being appended to (typically used with APPEND\_OUTPUT)
 APPEND\_OUTPUT\_AFTER\_TIME | {time}| Max time to read from an input db or a db being appended to (typically used with APPEND\_OUTPUT)

## Properties for the heartbeat output
 Property              | Value  | Description
-----------------------|--------|-----------------------------------------------------------
  FLUSH\_INTERVAL       | int   | Minimum time interval between flushing heartbeat data to disk.  Default is 10 seconds
  FLUSH\_INTERVAL       | int   | For non-heartbeat, the number of output steps between flushing data to disk; if 0, then no flush
  TIME\_STAMP\_FORMAT    | \[%H:%M:%S] | Format used to format time stamp.  See strftime man page
  SHOW\_TIME\_STAMP      | on/off | Should the output lines be preceded by the timestamp
  PRECISION            | 0..16 \[5] | Precision used for floating point output.
  FIELD\_WIDTH          | 0.. |  Width of an output field. If 0, then use natural width.
  SHOW\_LABELS          | on/\[off]  | Should each field be preceded by its name (ke=1.3e9, ie=2.0e9)
  SHOW\_LEGEND          | \[on]/off  | Should a legend be printed at the beginning of the output showing the field names for each column of data.
  SHOW\_TIME\_FIELD      | on/\[off]  | Should the current analysis time be output as the first field.

## Experimental

 Property              | Value  | Description
-----------------------|--------|-----------------------------------------------------------
MEMORY\_READ        | on/\[off]   | experimental
MEMORY\_WRITE       | on/\[off]   | experimental
ENABLE\_FILE\_GROUPS | on/\[off]   | experimental

## Debugging / Profiling

  Property | Value    | Description
 ----------|----------|------------
 LOGGING   | on/\[off] | enable/disable logging of field input/output
 DECOMP\_SHOW\_PROGRESS | on/\[off] | show memory and elapsed time during autodecomp.
 DECOMP\_SHOW\_HWM      | on/\[off] | show high-water memory during autodecomp
 IOSS\_TIME\_FILE\_OPEN\_CLOSE | on/\[off] | show elapsed time during parallel-io file open/close/create
 CHECK\_PARALLEL\_CONSISTENCY | ignored | check Ioss::GroupingEntity parallel consistency
