Message boards :
Number crunching :
Work units
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Send message Joined: 17 Sep 04 Posts: 14 Credit: 12,301 RAC: 0 |
I did get some workunits today. So my machine is crunching away. But I did notice that 8-10 workunits are done in a couple of seconds. Why are they done so fast? I have checked the message boks in boinc, but can't find any failure messages. <img border="0" src="http://boinc.mundayweb.com/one/stats.php?userID=530" /> |
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Send message Joined: 2 Sep 04 Posts: 16 Credit: 8,458 RAC: 0 |
As far as I know this is ok, it is because the particles gets unstable and then the simulation stops... - Peter > I did get some workunits today. So my machine is crunching away. But I did > notice that 8-10 workunits are done in a couple of seconds. > > Why are they done so fast? I have checked the message boks in boinc, but can't > find any failure messages. >  _ |
 Thierry Van Driessche Send message Joined: 1 Sep 04 Posts: 157 Credit: 82,604 RAC: 0 
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The answer for the different crunching times of a WU can be find here. Look to point 2.2 but also to point 2.3. From What is LHC@Home: Typically SixTrack simulates 60 particles at a time as they travel around the ring, and runs the simulation for 100000 loops around the ring. That may sound like a lot, but it is less than 10s in the real world. Still, it is enough to test whether the beam is going to remain on a stable orbit for a much longer time, or risks losing control and flying off course into the walls of the vacuum tube - a very serious problem that could result in the machine being stopped for repairs if it happens in real life. By repeating such calculations thousands of times, it is possible to map out the conditions under which the beam should be stable. Best greetings from Belgium Thierry |
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