> At the beginning of a parallel operation, we allocate a chunk of> > dynamic shared memory which persists even after some or all workers > have exited. It's only torn down at the end of the parallel operation. > That seems like the appropriate place to be storing any kind of data > that needs to be propagated between parallel workers. The current > patch uses the main shared memory segment, which seems unacceptable to > me.
Correct, DSM does track shared data. However only participating processes in the parallel vacuum can attach and lookup this data. The purpose of the main shared memory is to allow a process that Is querying the progress views to retrieve the information. Regards, Sami Imseih Amazon Web Services
