Move outstanding_acks increment to flush sending step.
The outstanding_acks counter was increased at each sync call (such as fence and flush). However, the counter had to be decreased again if flush ack is not required. It is more straightforward if increasing it only when the flush packet is issued (FLUSH flag piggyback or a separate flush message). Signed-off-by:Xin Zhao <xinzhao3@illinois.edu> Signed-off-by:
Pavan Balaji <balaji@anl.gov>
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