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backward endcap time consuming [message #10613] Fri, 30 April 2010 13:29 Go to previous message
Dmitry Khaneft is currently offline  Dmitry Khaneft
Messages: 75
Registered: January 2009
continuous participant
From: *kph.uni-mainz.de
Dear all,

I met a problem that simulations with my geometry of the EMC backward endcap go quite slow.

I tried different combinations of EMC geometry including very old ascii and one done by Ola and I found out that ascii geometry works much faster than mein or Ola's.

After asking some people what could be wrong I got an answer that problem could because of too complicated ProcessHit function in PndEmc.cxx. It has a lot of if() operators which could cause the problem.

As I understood this function is called each step in simulation for each particle. Thus if it could consume a lot of time in case of electromagnetic shower in EMC.

1. My first question is: where is the code responsible for processing events when ascii geometry is used? I think it should be inside ProcessHit function but I can't identify it. May be I could take a look in and than correct my code correspondingly. Because geometry in all cases should be essentially the same just the size and the position of crystals are different.

Another observation I done shows that in all cases there are error or warning(see below) + one of another kind which appears only in my case. In case of ascii geometry it appears not so often as in Ola's and in Ola's geometry it apperas less than in mine. I think it is the main problem because these warnigs take a lot of time compare to events processing.

2. What are this messages are and what can I do?

P.S. I tried to change max step number to different values up to 30000 but it changes nothing.

This warning appears in all cases and in different cases it gives different coordinates.
>>> Event 5
*** Particle reached max step number (10000). ***
10002      329    -56.7     -663      2.29        0        0      31.3      
cave Transportation
10003      329    -56.7     -663      2.29        0        0      31.3
CrystalVol Transportation
10004      329    -56.7     -663      2.29        0        0      31.3      
cave Transportation
10005      329    -56.7     -663      2.29        0        0      31.3
CrystalVol Transportation
*** Particle reached max step number (10000). ***

*********************************************************************************************************
* G4Track Information:   Particle = gamma,   Track ID = 60,   Parent ID = 59
*********************************************************************************************************


This kind of warnings appear only in my case.
+++++++++++++++++++++++         
No physical volume found at track vertex: (1.08019e+06,753627,-1.92401e+06)
++++  TG4Warning: ++++                                                    
    TG4TrackingAction::UserProcessHits:                              

Cannot locate track verrtex.                                            
+++++++++++++++++++++++

++++  TG4Warning:  ++++
    TG4SpecialControlsV2::SetSwitch:
    No limits defined in BoxVol
+++++++++++++++++++++++


best regards,
Dmitry

[Updated on: Fri, 30 April 2010 16:21]

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