Merge branch 'jolivet/rm-first-empty-line' into 'main'

Remove first and last empty lines

See merge request petsc/petsc!6892

Remove first and last empty lines

Merge branch 'perfstubs' into 'main'

Add the perfstubs package to petsc.

See merge request petsc/petsc!5516

Add the perfstubs package to petsc.

Example usage:

Configure PETSc with: ./configure --download-mpich
--download-fblaslapack

Build PETSc
Setup TAU:

wget http://tau.uoregon.edu/tau.tgz
./configure

Add the perfstubs package to petsc.

Example usage:

Configure PETSc with: ./configure --download-mpich
--download-fblaslapack

Build PETSc
Setup TAU:

wget http://tau.uoregon.edu/tau.tgz
./configure -cc=mpicc -c++=mpicxx -mpi -bfd=download -unwind=download &&
make install
export PATH=<tau dir>/x86_64/bin:$PATH

Build and run PETSc example with TAU:

cd $PETSC_DIR/src/snes/tutorials
make ex56
mpirun -n 4 tau_exec ./ex56 <args>

This should produce 4 profile...* files with profile data that can be
viewed with paraprof/pprof:

Reading Profile files in profile.*

NODE 0;CONTEXT 0;THREAD 0:
---------------------------------------------------------------------------------------
%Time Exclusive Inclusive #Call #Subrs Inclusive Name
msec total msec usec/call
---------------------------------------------------------------------------------------
100.0 26 1,838 1 41322 1838424 .TAU
application
73.2 1 1,345 2 168 672950
SNESSolve
62.2 3 1,142 2 1282 571442
SNESJacobianEval
62.0 1,136 1,138 2 76 569494
DMPlexJacobianFE
60.1 0.046 1,105 1 32 1105001 Solve
1
15.2 87 279 5 11102 55943 Mesh
Setup
13.2 0.315 241 1 32 241765 Solve
0
7.8 80 144 38785 38785 4
MPI_Allreduce()
7.0 69 128 6 43386 21491
DualSpaceSetUp
6.2 1 114 4 54 28536
PCSetUp
6.0 12 110 2 892 55407
PCSetUp_GAMG+
3.9 70 70 1 0 70888
MPI_Init_thread()
3.7 68 68 41747 0 2 MPI
Collective Sync
3.6 8 66 4 3536 16548
SNESFunctionEval
2.6 45 48 171 171 281
MPI_Bcast()
1.9 34 34 7836 0 4
MPI_Barrier()
1.8 0.567 33 2 68 16912 GAMG
Coarsen

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