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World Community Grid Forums
Category: Completed Research
Forum: AfricanClimate@Home
Thread: Please explain WU dependencies |
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Thread Status: Active Total posts in this thread: 2
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NixChix
Veteran Cruncher United States Joined: Apr 29, 2007 Post Count: 1187 Status: Offline Project Badges: 
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I am a bit confused by the descriptions of the dependicies between the fortnights (cycle) and the areas of the simulation.
----------------------------------------retsof: AC@H was a bit different. Each area was processed in SERIES. ACH1_27_45 depended on the results from ACH1_26_45 ... depended on the results from ACH1_25_45 ... depended on the results from ACH1_24_45 ............. and everything depended on ACH1_1_45. There were 82 area processing chains, and 10x redundancy for each area. Each area was something like 90000 hectares. The next fortnight could not get started for that area until the previous fortnight had a result for that area. That description makes perfect sense. That is the vertical dependency. Sekerob: ... The depencies are as what retsof describes. Before there was horizontal too i.e. cycle 14 would not start until 13 was complete for all 82 blocks, but that has effectively resulted in little project progress at all. We're now about 8 months in and still the 27x82x10 initial sets are not done. Sekerob, I thought that you were implying that there was a change, that at one time an entire fortnight had to complete (horizontal dependency) before the next fortnight in the entire simulation could proceed. NixChix: Are you saying that the dependencies were modified to speed the project up? When did that occur? All I am asking was did it change. If what Sekerob wrote is true; that there was a before; that there was a "horizontal dependency". It has been mentioned several times in postings. retsof: The dependencies were set by the scientists that wrote the program before the project even started. <rant>resof, are you saying that there has been no change? That the dependencies have been the same from the beginning of the project. Perhaps there was never a full "horizontal dependency", because there have been postings about current WUs from different fortnights at roughly the same time. If there was a full "horizontal dependency" that could not be. All posters would be always refering to the same fortnight. Well I don't want to ramble on. I just got suddenly curious about the dependencies after reading what seemed to be conflicting descriptions of the process.<rant/>  |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Work is sent out in batches. So, in an ideal world, WCG would send out cycle 1, then a complete cycle 2, and so on. The vertical dependency means they can't send out cycle 1 and 2 at the same time.
As the project has continued, various work unit failures have caused the cycles to get mixed a little. To keep the project moving, incomplete cycles have been sent out. This isn't ideal, and future projects are unlikely to be run the same way. |
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