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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="PetscBLASInt"><H1>PetscBLASInt</H1></A>
datatype used to represent 'int' parameters to BLAS/LAPACK functions.
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Usually this is the same as <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A>, but if PETSc was built with --with-64-bit-indices but
standard C/Fortran integers are 32 bit then this is NOT the same as <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> it remains 32 bit
(except on very rare BLAS/LAPACK implementations that support 64 bit integers see the notes below).
<P>
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Sys/PetscBLASIntCast.html#PetscBLASIntCast">PetscBLASIntCast</A>(a,&b) checks if the given <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> a will fit in a <A HREF="../Sys/PetscBLASInt.html#PetscBLASInt">PetscBLASInt</A>, if not it
generates a PETSC_ERR_ARG_OUTOFRANGE error
<P>
<H3><FONT COLOR="#CC3333">Installation Notes</FONT></H3>
./configure automatically determines the size of the integers used by BLAS/LAPACK except when --with-batch is used
in that situation one must know (by some other means) if the integers used by BLAS/LAPACK are 64 bit and if so pass the flag --known-64-bit-blas-indice
<P>
MATLAB ships with BLAS and LAPACK that use 64 bit integers, for example if you run ./configure with, the option
--with-blaslapack-lib=[/Applications/MATLAB_R2010b.app/bin/maci64/libmwblas.dylib,/Applications/MATLAB_R2010b.app/bin/maci64/libmwlapack.dylib]
<P>
MKL ships with both 32 and 64 bit integer versions of the BLAS and LAPACK. If you pass the flag -with-64-bit-blas-indices PETSc will link
against the 64 bit version, otherwise it use the 32 bit version
<P>
OpenBLAS can be built to use 64 bit integers. The ./configure options --download-openblas -with-64-bit-blas-indices will build a 64 bit integer version
<P>
External packages such as hypre, ML, SuperLU etc do not provide any support for passing 64 bit integers to BLAS/LAPACK so cannot
be used with PETSc when PETSc links against 64 bit integer BLAS/LAPACK. ./configure will generate an error if you attempt to link PETSc against any of
these external libraries while using 64 bit integer BLAS/LAPACK.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscMPIInt.html#PetscMPIInt">PetscMPIInt</A>, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A>, <A HREF="../Sys/PetscBLASIntCast.html#PetscBLASIntCast">PetscBLASIntCast</A>()
<BR>
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../include/petscsystypes.h.html#PetscBLASInt">include/petscsystypes.h</A>
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