Why is MAX_AGG_BUF fixed about adios HOT 3 CLOSED

This is a warning only, because we did not find advantage for
gathering more blocks into a larger buffer. The BG stands for the brigade
strategy, where this warning does not even make sense. The BG strategy in
MPI_AGGREGATE (the default strategy now), simply receives and writes out
each process' output data individually; there is no buffering of several
process' output together. The other, original strategy did buffer data from multiple
processes before writing a single large buffer; good
for small data/process type applications; the warning makes sense here,
although this strategy also works until you run out of memory.

We have removed this warning for the BG strategy and only give a detailed error message when there is not enough memory.

from adios.

Note, that you can choose the original aggregation strategy by passing the
'aggregation_type=1' argument to the MPI_AGGREGATE method (in the XML file, or in the adios_select_method() call). The BG strategy would be 2, which is now the default strategy.

<transport group="writer" method="MPI_AGGREGATE">
     num_aggregators=64;num_ost=64;aggregation_type=1
</transport>

from adios.

Thanks for the info.

from adios.