Message boards :
Xtrack/SixTrack :
Very short WU
Message board moderation
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 Send message Joined: 11 Oct 18 Posts: 5 Credit: 245,840 RAC: 0  
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I noticed that few WUs from newest batch of the new tasks are very, very short Name w-c0_0.000_job.B1inj_c0_0.000.3515__54__s__64.28_59.31__14.1_18.1__6__3_1_sixvf_boinc15814_0 Workunit 112300201 Run time 11 sec CPU time 8 sec Validate state Valid Credit 0.03 Device peak FLOPS 2.47 GFLOPS Application version SixTrack v502.05 (sse2) windows_x86_64 I am curious why it takes less than a minute to run them. 
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 Veronica Send message Joined: 29 Sep 17 Posts: 14 Credit: 5,244,196 RAC: 0 |
From the job name it looks like the particles in that work unit have a large amplitude, so I expect they may have been lost in the simulation. When the particles are lost, the simulation stops early. The simulations we send to BOINC are usually large scans of parameters, and a certain fraction of them will tend to be very short. This is just the nature of the studies we do. SixTrack 5 Core Developer. github.com/SixTrack/SixTrack |
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Send message Joined: 11 Oct 18 Posts: 5 Credit: 245,840 RAC: 0
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Thank you for clarification.
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 Send message Joined: 12 Jun 18 Posts: 126 Credit: 55,923,724 RAC: 14,030 
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Hi Veronica, That was very symplectic of you to explain that to us. Now if I could just get my head around 6-dimensional ;-} 
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Veronica Send message Joined: 29 Sep 17 Posts: 14 Credit: 5,244,196 RAC: 0 |
Hi Veronica, That was very symplectic of you to explain that to us. Now if I could just get my head around 6-dimensional ;-} In our case, 6 dimensions is easy. It's just the three coordinates for the current position of the particle, and three more describing the direction it's headed. :) SixTrack 5 Core Developer. github.com/SixTrack/SixTrack |
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Send message Joined: 2 May 07 Posts: 2278 Credit: 178,775,457 RAC: 11,258
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Fortran have max. 7 Dimensiones, when remember correct (Fortran77) ;-) |
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Veronica Send message Joined: 29 Sep 17 Posts: 14 Credit: 5,244,196 RAC: 0 |
Fortran have max. 7 Dimensiones, when remember correct (Fortran77) ;-) I believe Fortran 2008, which we use, has a maximum rank of 15. In any case, 6 coordinates for our particles means that we need n x 6 of storage for n particles. So only rank 2 if we were to use a single array for it. SixTrack 5 Core Developer. github.com/SixTrack/SixTrack |
Magic Quantum Mechanic Send message Joined: 24 Oct 04 Posts: 1240 Credit: 82,794,826 RAC: 136,503 
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After you run Sixtracks for a while you will get used to those 30 second WU's I have been seeing thousands of them since 2004 which means there must be at least a million so far but it is nice to have them finish and start running new ones without wasting time like VB tasks have done once or twice |
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