> 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