petsc-3.7.7 2017-09-25
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PetscSSEIsEnabled

 Determines if Intel Streaming SIMD Extensions (SSE) to the x86 instruction set can be used. Some operating systems do not allow the use of these instructions despite hardware availability.

Synopsis

#include "petscsys.h" 
static PetscBool petsc_sse_local_is_untested  = PETSC_TRUE;
static PetscBool petsc_sse_enabled_local      = PETSC_FALSE;
static PetscBool petsc_sse_global_is_untested = PETSC_TRUE;
static PetscBool petsc_sse_enabled_global     = PETSC_FALSE;
PetscErrorCode  PetscSSEIsEnabled(MPI_Comm comm,PetscBool  *lflag,PetscBool  *gflag)
Collective on MPI_Comm

Input Parameter

comm -the MPI Communicator

Output Parameters

lflag -Local Flag: PETSC_TRUE if enabled in this process
gflag -Global Flag: PETSC_TRUE if enabled for all processes in comm

Notes

NULL can be specified for lflag or gflag if either of these values are not desired.

Options Database Keys

-disable_sse -Disable use of hand tuned Intel SSE implementations

Level:developer
Location:src/sys/utils/sseenabled.c
Index of all Sys routines
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Index of all manual pages