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.TH "MPI_T_PVAR_START" "3" "Feb 06, 2024" "" "Open MPI"
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\fI\%MPI_T_pvar_start\fP, \fI\%MPI_T_pvar_stop\fP \- Start/stop a performance
variable
.SH SYNTAX
.SS C Syntax
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.INDENT 3.5
.sp
.nf
.ft C
#include <mpi.h>

int MPI_T_pvar_start(MPI_T_pvar_session session, MPI_T_pvar_handle handle)

int MPI_T_pvar_stop(MPI_T_pvar_session session, MPI_T_pvar_handle handle)
.ft P
.fi
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.SH INPUT PARAMETERS
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.IP \(bu 2
\fBsession\fP: Performance experiment session.
.IP \(bu 2
\fBhandle\fP: Performance variable handle.
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.SH DESCRIPTION
.sp
\fI\%MPI_T_pvar_start\fP starts the performance variable with the handle
specified in \fIhandle\fP\&. The special value MPI_T_PVAR_ALL_HANDLES can be
passed in \fIhandle\fP to start all non\-continuous handles in the session
specified in \fIsession\fP\&.
.sp
\fI\%MPI_T_pvar_stop\fP stops the performance variable with the handle specified
in \fIhandle\fP\&. The special value MPI_T_PVAR_ALL_HANDLES can be passed in
\fIhandle\fP to stop all non\-continuous handles in the session specified in
\fIsession\fP\&.
.sp
Continuous performance variables can neither be started nor stopped.
.SH ERRORS
.sp
\fI\%MPI_T_pvar_start\fP and MPI_T_pvar_stop() will fail if:
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.IP \(bu 2
\fBMPI_T_ERR_NOT_INITIALIZED\fP: The MPI Tools interface not initialized
.IP \(bu 2
\fBMPI_T_ERR_INVALID_SESSION\fP: Session parameter is not a valid session
.IP \(bu 2
\fBMPI_T_ERR_INVALID_HANDLE\fP: Invalid handle or handle not associated with the session
.IP \(bu 2
\fBMPI_T_ERR_PVAR_NO_STARTSTOP\fP: The variable cannot be started or stopped
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.sp
\fBSEE ALSO:\fP
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.INDENT 3.5
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.IP \(bu 2
\fI\%MPI_T_pvar_get_info\fP
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.SH COPYRIGHT
2003-2024, The Open MPI Community
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