Message boards :
Number crunching :
Validation
Message board moderation
Author | Message |
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Send message Joined: 22 Feb 14 Posts: 4 Credit: 24,911 RAC: 0 |
I have just started running LHC@home and I have a concern. It deals with the validation. While reading about this project online I came across a posting (about 3 years old), that if I understand it right, said that 5 copies of each WU are sent out, but, only the first to finish 3 are needed to validate. It said that the last 2 results are discarded as unnecessary. Is this true? This is a concern to me as I don’t have the fastest machines and I don’t want to waste my time. Are the 4th or 5th place finishes just tossed into the trash can as unneeded. The posting that I read also said that the moderators remove questions like this because the project Admins don’t want to admit that this wasteful practice exists. I am used to running climate models over at CPDN. They except everything that is finished, even if it arrives 3 years after the deadline. |
Send message Joined: 15 Sep 13 Posts: 73 Credit: 5,763 RAC: 0 |
They've stopped that very wasteful practice. They issue 2 copies of each task and don't issue a 3rd copy unless the first 2 results don't match. They need 2 matching results to verify that they have the correct "answer" for the calculations in the task. 6 bangers are for wussies. |
Send message Joined: 22 Feb 14 Posts: 4 Credit: 24,911 RAC: 0 |
Thank you for the info. I am very happy to learn that they no longer use the wasteful 5/3 system. I can now have confidence that my efforts will be worth the electricity. |
Send message Joined: 12 Jul 11 Posts: 857 Credit: 1,619,050 RAC: 0 |
Don't worry Jim; we are not 'cheating" like that. We run only two copies, the minimum, and only run additional WU's when there is a discrepancy. It is true that we did run many more a long time in the past when starting up and actually forgot! to reduce the number until a friendly volunteer pointed it out. Thanks for your interest and support. Eric. |
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