[mcstas-users] Could Virtual_output/Virtual_input raise efficiency?

[Emmanuel FARHI]

Hello,

The event file contains 172000 events. It seems strange that I2 takes 20
minutes ! It should be a glimpse of an eye (a few seconds). Do you use a
network disk ?

E.

> Hi colleagues,
>
>
>
>
>      Learning to use Virtual_output/Virtual_input, I found something
> interesting:
>
> I put Virtual_output and PSD after monochromator to end the fisrt split
> simulation I1:
>
> DEFINE INSTRUMENT I1(¡­)
>
> <CUT. Source, Channel, guide, Collimator and Monochromator. See my
> previous mail>
>
> /******************psd_after_mono********************/
>
> COMPONENT psd_after_mono = PSD_monitor(
>
>     nx = 90, ny =90, filename = "psd_after_mono ",
>
>     xwidth =0.2, yheight =0.2)
>
>   AT (0, 0, 0.4) RELATIVE mono_out
>
> /********************Virtual_output*********************/
>
> COMPONENT DataAfterMono = Virtual_output(
>
>     file = "DataAfterMono")
>
>   AT (0, 0, 0.4) RELATIVE mono_out
>
>
>
> Then run it with ncount=1E8 and Scilab format. The obtained data file
> ¡°psd_after_mono¡± suggests I I_err N=[4.02214E+8 2.18807E+6 172701].
>
> The second split simulation I2 only includes a PSD behind:
>
> DEFINE INSTRUMENT I2(¡­)
>
> COMPONENT SourceAfterMono = Virtual_input(
>
>     file = "DataAfterMono_list.p.x.y.z.vx.vy.vz.t.sx.sy.sz", repeat_count
> = 1)
>
>   AT (0,0,0) ABSOLUTE
>
> COMPONENT PsdAtEntrance = PSD_monitor(
>
>     filename = "PsdAtEntrance", xwidth = 0.2, yheight = 0.2)
>
>   AT (0, 0, 1.1) RELATIVE SourceAfterMono
>
>
>
> Then ncount is set as 1E8 corresponding to repeat_count=1.To my surprise,
> running I2 needs 20 minutes as much time as I1.It means that, in this
> case, the use of  Virtual_output/Virtual_input would¡¯t help to raise
> simulation efficiency.
>
>
>
> I suspect the phenomenon is related to high I and N at SourceAfterMono.
> But I¡¯m not sure. Would you please give some explanation?
>
>
>
> Best wishes,
>
> Tom
>
>
>
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>


-- 
FARHI Emmanuel <farhi at ill.fr>
Groupe DS/CS, ILL4/156, Tel 04 76 20 71 35
ILL, Grenoble
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