climateprediction.net home page
task distribution

task distribution

Questions and Answers : Wish list : task distribution
Message board moderation

To post messages, you must log in.

AuthorMessage
old_user609079

Send message
Joined: 5 Jan 10
Posts: 1
Credit: 80,826
RAC: 0
Message 38643 - Posted: 5 Jan 2010, 14:49:00 UTC

How comes that everyone does the same research? Shouldnt the tasks be distributed? Right now the research is done over and over again, isn\'t it?

Just asking
ID: 38643 · Report as offensive     Reply Quote
Profile Iain Inglis

Send message
Joined: 9 Jan 07
Posts: 467
Credit: 14,549,176
RAC: 317
Message 38644 - Posted: 5 Jan 2010, 15:26:39 UTC - in response to Message 38643.  

The tasks are distributed. In the BOINC/CPDN jargon a work unit is the fundamental and unique unit of work - if each \'result\' from a work unit were run on an identical computer then the work unit would produce a number of duplicate results. In practice, results from the same work unit run on different computers (e.g. different operating system) produce slightly different results, which are then combined to produce a composite result for the work unit. Of course, many/most results are never completed.

If the CPDN work units were shorter then as each result fails or expires another result would be issued until at least one result is completed for each work unit. However, CPDN work units are too long for that kind of subtlety - so the consequence for us is some duplication among popular platforms (i.e. Windows/Intel) within work units.

Work units themselves should not be duplicated (but sometimes are).
ID: 38644 · Report as offensive     Reply Quote

Questions and Answers : Wish list : task distribution

©2024 cpdn.org