setenv MPIO_DIRECT_READ TRUE setenv MPIO_DIRECT_WRITE TRUETo use the hints method, the two keys are direct_read and direct_write. By default their values are false. To turn on direct I/O, set the values to true. The environment variables have priority over the info keys. In other words, if the environment variables are set to TRUE, direct I/O will be used even if the info keys say false, and vice versa. Note that direct I/O must be turned on separately for reading and writing. The environment-variables method assumes that the environment variables can be read by each process in the MPI job. This is not guaranteed by the MPI Standard, but it works with SGI's MPI and the ch_shmem device of MPICH.
cd /tmp/thakur /home/thakur/romio/configure makeThe .o files will be created in /tmp/thakur; the library will be created in
/home/thakur/romio/configure -make=/usr/gnu/bin/gmake (or whatever)
Rob Latham 2016-08-01