taskTransport Sample Protocol - Tasks: task #4737, Implement zero copy and reversed...


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task #4737: Implement zero copy and reversed blackboard

Submitter:  Eric NOULARD <erk>
Submitted:  Tue 04 Oct 2005 08:19:37 AM UTC
Category:  Blackboard Should Start On:  Mon 03 Oct 2005 10:00:00 PM UTC
Should be Finished on:  Mon 03 Oct 2005 10:00:00 PM UTC Priority:  5 - Normal
Status:  None Privacy:  Public
Assigned to:  None Percent Complete:  0%
Open/Closed:  Open Effort:  0.00

Tue 04 Oct 2005 08:19:37 AM UTC, original submission:  

The bb_provider use its own shadow blackboard
for distribution which makes memory consumption fairly
high with huge blackboard.
We may implements 2 things in order to cope with this:

1) A zero copy mode for the bb_provider which
   should work directly with the "shared blackboard"
   without shadow copy.
   This could be -z command line option

2) Re-Enable a 'synchronized' mode where the bb_provider should
   signal the BB user (using the message queue with
   that the data has effectively
   been copied (or distributed if in zero copy mode)
   (this mode should be failry easy to implements
    since code is there but commented)
   This could be a -s command line option.

3) A good companion to zero copy BB would be
   a reversed blackboard were someone bb_publishing
   will pass an address of local var as a supplementary
   The reversed BB would memorize the @ and the
   BB user may bb_reverse_synchronize wich will
   automatically copy value from local address
   provided during publish to shared published data.
   This 'reversed' blackboard would ease TSP distribution
   for application who have to stick with local var
   instead of shared memory BB model with pointer.
   Using a bb_provider in zero copy mode will provide
   low cost TSP distribution.
   (seek for "reversed blacboard" in tsp-devel)

Eric NOULARD <erk>
Group administrator


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