Changes between Version 19 and Version 20 of FAQ


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Timestamp:
Dec 22, 2010, 6:45:56 PM (9 years ago)
Author:
dtodd
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  • FAQ

    v19 v20  
    3232
    3333=== Why does Simulation appear to hang or slow down for large spin systems? ===
    34 Simulation relies on the [gamma:wiki GAMMA] package. When doing calculations with a spin of 8,9, or 10, your system may appear to slow down or even hang. At a spin count of 7, a single FID experiment takes 0.4 seconds, but at spin 10 it takes 1 hour and 24 minutes (on a 2.66 GHz Intel machine). [gamma:GammaVsSpin Here is a list of results for various spin sizes]. The "slow down" may be compounded if doing a large number of individual simulations for different timings (or spacial locations). The time it takes to run these specific jobs is virtually identical in Gamma, as there is little overhead compared to the time of the calculations.
     34Simulation relies on the [gamma:wiki GAMMA] package. When doing calculations with a spin of 8,9, or 10, your system may appear to slow down or even hang. At a spin count of 7, a single FID experiment takes GAMMA 0.4 seconds, but at spin 10 it takes 1 hour and 24 minutes (on a 2.66 GHz Intel machine). [gamma:GammaVsSpin Here is a list of GAMMA timing results for various spin sizes]. The "slow down" may be compounded if doing a large number of individual simulations for different timings, or spacial locations. Note: The time it takes to run these specific jobs is virtually identical in Gamma compared to Simulation, as there is little overhead converting arrays to and from Python, as compared to the overall time of the calculations.
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