GitLab

Updating the CCIO documentation to include much more complete information (close to the inflormation needed for ECP milestone report)

Adding ccio_overview.md, but the documentation is old. I will replace the file with up-to-date documentetaiton in the next commit (this commiet is just saving older work)

making significant changes to simplify the exerciser benchmark, and to add documentation. You should look a few commits back to see some of the topology-aware and early-ccio-specific cunctionality that has been stripped out for simplicity

major exerciser cleanup - getting ready to merge with master and there needs to be very clear documentation to point to in topology-aware VFD milestone report

changing rshift to shift both read and write ops, because we have unchache flag now. The rshift now provides a case where strided agg placement is a bith off

updtate of topology branch - adding uncache option. About to change readshift option to shift ranks for read and write (seems to highlight topology placement importance

improving topology version of exerciser to allow contrived example, where agg selection should matter. maybe

revising documentation, and setting up exerciser to run with CCIO VFDL containing topology-aware aggregator selection

adding option --rshift to require the read to occur on data that is shifted from position where the rank originally wrote to.  By setting this to ppn, the option should allow us to measure the read performance with mitigated caching effects

adding topology api to the exerciser code to test the effect of aggregator selection on the collective performance

Commenting out the USING_CCIO definition in Exerciser/exerciser.c (keeping master branch compatible with official HDF5 distributions)