[Gate-users] /gate/output/root/setSaveRndmFlag

[yuxuan.zhang at di.mdacc.tmc.edu]

hi, Daniel,

I have also spent quite some time on the random engine of GATE(Geant4), so
maybe I can give my suggestions.

1.  To solve your problem about the root file output, don't disable the 
ROOT output,
instead, set all the related root output option (single, hits, 
coincidences, etc.) as 0,
thus there will only be an empty gate.root file with a fixed size of 11kB.

2.  I have double about your method of modifying one number in the 
endOfRun.rndm file.
I remember that there's a talk about this issue in this email list some 
time ago. Someone
who has more knowledeg about the random generator engine of Geant4 said 
you cannot 
get statistically independent randoms by just modify the *.rndm file. So I 
suggest you
be careful about your method. You can search the user talk and you can 
also find
a small program which can generate a *.rndm file.

Best regards

Yuxuan

below is the email and program by Angela Foudray, July 12, 2006:



Hey Seyjoon,

We've got a little program that writes out a file in the format that GATE 
is looking for.  It's not exactly pretty, but it does what you are looking 
for.  Here's a few things about it:

1) It always writes the output to a file called "test.rndm" (so copy this 
file to something else before running the program again)
2) It always ends in a segmentation fault, but its really done it's job 
(been too lazy to change this since it does what you are really looking 
for it to do - i.e. make a file with GATE random seed syntax)
3) You run it with the seed as a flag passed at the command line, so to 
use it you run:

./testRandom 31245

(exchange 31245 with the random seed of your choice).  And voila, a file 
with a new seed.

Send all your praise and kisses to Garry Chinn (gchinn at stanford.edu).

Let me know if you have any questions.
Ange



Seyjoon wrote: 
hi
 
'GATE-USERS Talk' webpage doesn't open in opengatecollaboration site.
I hope to search for a method of generating random seed file (.rndm)
but it just shows blank page.
 
Can anyone tell me how to make it?
 
Regards, 
Seyjoon

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"Daniel Woodsworth" <danieljw at phas.ubc.ca>
Sent by: gate-users-bounces at lists.healthgrid.org
07/16/2007 06:30 PM

 
        To:     gate-users at lists.healthgrid.org
        cc: 
        Subject:        [Gate-users] /gate/output/root/setSaveRndmFlag


Hi,

I am trying to set up a system to run statistically independent
runs/simulations of a single physical setup (phantom, activity, geometry,
scanner, electronics etc.) The way I am doing this, is I have a little
script that takes an old endOfRun.rndm file and edits one of the numbers,
which (I believe), when the simulation is run from a directory containing
an endOfRun.rndm file causes Gate to produce a new (independent) stream of
random numbers. So the script makes multiple, different, endOfRun.rndm
files and launches a simulation from distinct directories. This all seems
to work fine and yield independent simulations.

However, if I try and disable the ROOT output (/gate/output/root/disable),
then I no longer get independent runs. I am guessing this is since the
setSaveRndmFlag is part of the /root tree structure. Ie the command
/gate/output/root/disable kills any commands which start with
/gate/output/root, including setSaveRndmFlag.

At any rate, somehow disabling the ROOT output disrupts the GATE procedure
of using the endOfRun.rndm file as a starting point for the random number
generator.

I would like to be able to run simulations with just interfile output, as
sometimes I only need projection data, and the root output slows down the
simulation and tends to be very large data files.

Has anyone come across this? Does anyone know how to force GATE to use
endOfRun.rndm as the starting point for the random number stream, with the
ROOT output disabled?

Thanks for any help.

Daniel

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