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FDS Source and User Guide: Switch default SMV parallel write to .FALSE. #14329

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marcosvanella merged 2 commits into from
Mar 4, 2025
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FDS Source and User Guide: Switch default SMV parallel write to .FALSE. #14329

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FDS Source: Switch default SMV parallel write to .FALSE.
marcosvanella Mar 4, 2025
ad9715b
FDS User Guid: rework SMV_PARALLEL_WRITE paragraph.
marcosvanella Mar 4, 2025
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2 changes: 1 addition & 1 deletion Manuals/FDS_User_Guide/FDS_User_Guide.tex
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Expand Up @@ -9577,7 +9577,7 @@ \chapter{Output}
\item A list of HVAC output quantities is given in Sec.~\ref{info:hvacoutputquantities}.
\end{itemize}
The namelist group \ct{DUMP} contains parameters (Table \ref{tbl:DUMP}) that control the rate at which output files are written, and various other global parameters associated with output files. There can only be one \ct{DUMP} line in the input file.
By default, FDS outputs all result files to the current working directory. A separate output directory for binary files can be specified by the user by setting \ct{RESULTS_DIR} on the \ct{DUMP} line. A single text file \ct{CHID.smv} is always written with high level information about the case~\cite{Smokeview_Users_Guide}. By default, this file is written in parallel using MPI I/O routines. This feature can be disable setting \ct{SMV_PARALLEL_WRITE=F} in the \ct{DUMP} line, in which case, MPI rank 0 will write the file.
By default, FDS outputs all result files to the current working directory. A separate output directory for binary files can be specified by the user by setting \ct{RESULTS_DIR} on the \ct{DUMP} line. A single text file \ct{CHID.smv} is always written with high level information about the case~\cite{Smokeview_Users_Guide}. By default, the information is gathered in MPI rank 0 which writes the file. For computations involving parallel file systems and many MPI processes, the file can also be written in parallel using MPI I/O routines setting \ct{SMV_PARALLEL_WRITE=T} in the \ct{DUMP} line.


\section{Controlling the Frequency of Output}
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2 changes: 1 addition & 1 deletion Source/cons.f90
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Expand Up @@ -196,7 +196,7 @@ MODULE GLOBAL_CONSTANTS
LOGICAL :: SETUP_ONLY=.FALSE. !< Indicates that the calculation should be stopped before time-stepping
LOGICAL :: CHECK_MESH_ALIGNMENT=.FALSE. !< Indicates that the user wants to check the mesh alignment and then stop
LOGICAL :: SMOKE3D=.TRUE. !< Indicates that the 3D smoke and fire output is desired
LOGICAL :: SMV_PARALLEL_WRITE=.TRUE. !< If true, the CHID.smv file is written in parallel using MPI-IO.
LOGICAL :: SMV_PARALLEL_WRITE=.FALSE. !< If true, the CHID.smv file is written in parallel using MPI-IO.
LOGICAL :: STATUS_FILES=.FALSE. !< Produce an output file CHID.notready which is deleted if the simulation completes
LOGICAL :: LOCK_TIME_STEP=.FALSE. !< Do not allow time step to change for diagnostic purposes
LOGICAL :: RESTRICT_TIME_STEP=.TRUE. !< Do not let the time step increase above its intial value
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