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Send message Joined: 9 Nov 07 Posts: 131 Credit: 180,454 RAC: 0 |
But Al ...all that being said and true ....Travis has also said we are beating the BlueGene supercomputer in both the amount of results returned and the short turnaround time so how can Boinc not be at least an adequate platform? I agree Cori, I don't see a problem with the 12 hr turn around, it seem like it's more than enough time. CLICK TO HELP BUILD |
Send message Joined: 29 Aug 07 Posts: 20 Credit: 2,710,089 RAC: 0 |
BOINC should work fine with this project. The short deadlines will make the client work on this project more in the short term, however the client will eventually decide to run other projects. Reducing the number of tasks out per CPU will not cause insurmountable problems. I also run BURP there the deadlines are normally 12 hours and you are only allowed 2 tasks per CPU. Not having a constant supply of work can also be a plus in this situation. It makes the client switch to different projects more often. It is a disadvantage for participants that do not have a constant connection to the internet though. If they do not connect often enough to return the tasks they may not be able to return and get credit quick enough. BOINC WIKI BOINCing since 2002/12/8 |
Send message Joined: 28 Aug 07 Posts: 31 Credit: 86,152,236 RAC: 0 |
As has been said above, the project needs to set it's parameters according to science. Not every project is for every computer - and should not be. Finishing 200-years Spin-up model on CPDN will take me about 4 months of C2Q running 24/7. Or it would have been a year+ on C2D office machine. Or 3-5 years on laptop. Not every machine is up to the job that a particular project requires and that's OK. |
Send message Joined: 9 Nov 07 Posts: 131 Credit: 180,454 RAC: 0 |
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Send message Joined: 27 Aug 07 Posts: 85 Credit: 405,705 RAC: 0 |
Deadlines should be set so that the science of the project is done. Time critical tasks should have shorter and tighter deadlines than non-time sensitive ones. There is no reason that a BOINC client cannot cope with deadlines as short as 3 hours if the tasks can be done in less than that time. V5.10 should be able to cope with deadlines as short as several minutes. The reason for 3 hours is the default connection interval for older clients is 2.4 hours. BOINC will eventually drop the LTD of a project with short deadlines low enough so that it is not a candidate for receiving work. A useful modification to the server (if it is not already in place) would be to block work allocation to hosts that have a connection interval larger than the time to deadline of the task. The connection interval is a promise by the user that the computer will be allowed to attach to projects at least that frequently. That said, I personally would hope for deadlines slightly longer than 12 hours as I have 6 computers that cannot be attached for 14 hour stretches and I would have to detach those. If the deadlines should be that short, then those computers should not be attached anyway. BOINC WIKI |
Send message Joined: 9 Nov 07 Posts: 131 Credit: 180,454 RAC: 0 |
Deadlines should be set so that the science of the project is done. Time critical tasks should have shorter and tighter deadlines than non-time sensitive ones. There is no reason that a BOINC client cannot cope with deadlines as short as 3 hours if the tasks can be done in less than that time. V5.10 should be able to cope with deadlines as short as several minutes. The reason for 3 hours is the default connection interval for older clients is 2.4 hours. Isn't there a way to go into one of the boinc files to change the LTD? It seems to me I read that in a thread a long time ago at SETI. CLICK TO HELP BUILD |
Send message Joined: 12 Nov 07 Posts: 2425 Credit: 524,164 RAC: 0 |
Isn't there a way to go into one of the boinc files to change the LTD? It seems to me I read that in a thread a long time ago at SETI. Yes, go to the Client state file, open with Notepad, search for 'long', change and save. Doesn't expecting the unexpected make the unexpected the expected? If it makes sense, DON'T do it. |
Send message Joined: 8 Oct 07 Posts: 289 Credit: 3,690,838 RAC: 0 |
Isn't there a way to go into one of the boinc files to change the LTD? It seems to me I read that in a thread a long time ago at SETI. This must be done with the Boinc client closed imho. |
Send message Joined: 10 Nov 07 Posts: 96 Credit: 29,931,027 RAC: 0 |
Isn't there a way to go into one of the boinc files to change the LTD? Make sure also that the sum of all projects’ debts is zero when you’re done. |
Send message Joined: 12 Nov 07 Posts: 2425 Credit: 524,164 RAC: 0 |
This must be done with the Boinc client closed imho. Yes it is, forgot that. Also if you want to be sure that you don't screw up, copy the file before changes. Doesn't expecting the unexpected make the unexpected the expected? If it makes sense, DON'T do it. |
Send message Joined: 9 Nov 07 Posts: 131 Credit: 180,454 RAC: 0 |
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Send message Joined: 12 Nov 07 Posts: 2425 Credit: 524,164 RAC: 0 |
I believe so. If you want one project to run more or less you can change accordingly. Short debt I think is daily, and Long debt is monthly. The ones I have suspended still add time eventually. Doesn't expecting the unexpected make the unexpected the expected? If it makes sense, DON'T do it. |
Send message Joined: 9 Nov 07 Posts: 131 Credit: 180,454 RAC: 0 |
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Send message Joined: 27 Aug 07 Posts: 85 Credit: 405,705 RAC: 0 |
I believe so. If you want one project to run more or less you can change accordingly. Short term debt determines what runs next unless a project needs EDF. Long term debt determines what project gets the next chance at download (there are several gates as well, but the highest LTD that passes the gates is contacted for work). BOINC WIKI |
Send message Joined: 27 Aug 07 Posts: 85 Credit: 405,705 RAC: 0 |
thanks everyone :) Positive debt means that it is owed CPU time negative debt means that it has used too much and owes CPU time. BOINC WIKI |
Send message Joined: 27 Aug 07 Posts: 85 Credit: 405,705 RAC: 0 |
Isn't there a way to go into one of the boinc files to change the LTD? BOINC will do the re-balance for you if it isn't. BOINC WIKI |
Send message Joined: 27 Aug 07 Posts: 85 Credit: 405,705 RAC: 0 |
With a 5 day deadline, BOINC can be rather relaxed about returning results. It will wait up to a day in the most recent code if there is work from other projects to be done and no work fetch is needed from MilkyWay. Best is if the deadlines are set to match the needs of the science. BOINC WIKI |
Send message Joined: 12 Nov 07 Posts: 2425 Credit: 524,164 RAC: 0 |
It has been awhile since I had to change much. Doesn't expecting the unexpected make the unexpected the expected? If it makes sense, DON'T do it. |
Send message Joined: 10 Nov 07 Posts: 96 Credit: 29,931,027 RAC: 0 |
Make sure also that the sum of all projects’ debts is zero when you’re done. But it might make adjustments other than you would like, mightn’t it? E.g. adding debt back to the project you had just manually reduced? |
Send message Joined: 27 Aug 07 Posts: 85 Credit: 405,705 RAC: 0 |
Make sure also that the sum of all projects’ debts is zero when you’re done. It shifts them all the same amount. Example: You start with 2 projects at +100,000 and -100,000. You set the second to 0 (for +100,000 and 0). BOINC will shift these to be +50,000 and -50,000. This keeps the relative distance between them the same (100,000). BOINC has to do this when a project is detached or reset. BOINC WIKI |
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