use pkg-config if HDF5 pkgconfig is available

use pkg-config if HDF5 pkgconfig is available

Github action: build HDF5 using cmake

Github action: build HDF5 using cmake

Github action: build HDF5 using cmake

Github action: PnetCDF requires libtool 2.5.4

Github action: PnetCDF requires libtool 2.5.4

Github action: PnetCDF requires libtool 2.5.4

HDF5 built with cmake may produce invalid "Extra libraries"

valgrind warning: uninitialized variables

warning: comparison of integer expressions of different signedness

column_wise.c: initialize buffer contents and print write amount

column_wise.c: initialize buffer contents and print write amount

Github action: bump up PnetCDF and MPICH versions

column_wise.c: initialize buffer contents and print write amount

PnetCDF driver: fix file open mode for reading decomposition files

Collect performance metrics by using one MPI_Gather instead of multip…

column_wise.c: initialize buffer contents and print write amount

alltomany.c: add a special case when #MPI processes = 1344

column_wise.c: print timing and bandwidth

add option -m, max number of receivers

print MPICH version

add option -s to use MPI_Issend

alltoall.c: use MPI_Isend instead of MPI_Issend

alltoall.c: fix total message send amount

alltoall.c: add option to use MPI_Alltoallv

alltoall.c: add option to use MPI_Alltoallv

add program to test MPI issend/irecv of all-to-many

add an MPI program that uses column-wise data partitioning pattern