PETSc version 3.17.4
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# PetscOmpCtrlOmpRegionOnMasterBegin

Mark the beginning of an OpenMP library call on master ranks

### Synopsis

    #include "petscsys.h"
    PetscErrorCode PetscOmpCtrlOmpRegionOnMasterBegin(PetscOmpCtrl ctrl)

### Input Parameter

| ctrl | - a PETSc OMP controller

### Notes

Only master ranks can call this function. Call PetscOmpCtrlGetOmpComms() to know if this is a master rank. This function changes CPU binding of master ranks and nthreads-var of OpenMP runtime

### See Also

PetscOmpCtrlOmpRegionOnMasterEnd()

### Level

developer

### Location

src/sys/utils/mpishm.c
Index of all Sys routines
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