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Re: backward endcap time consuming [message #10637 is a reply to message #10613]

Thu, 06 May 2010 12:04

Dima Melnychuk
Messages: 213
Registered: April 2004
Location: National Centre for Nucle...

first-grade participant

From: *fuw.edu.pl

Hi Dmitry,

It seems that I partially solved the problem with time consumption with EMC endcaps simulation with root geometry.

The following lines of code in PndEmc::ProcessHits() were executed at each hit but results were not used. However these calculation were rather time consuming.

244 Int_t daughtQuar = gMC->NofVolDaughters(namQuar);
245 Int_t daughtSub = gMC->NofVolDaughters(namSub);
246 Int_t daughtBox = gMC->NofVolDaughters(namBox);
247 Int_t daughtCrys = gMC->NofVolDaughters(namCrys);

Equivalent lines of code were for forward endcap also. So I have removed them with rev. 8554. As a results simulations with Geant4, energy=0.7 GeV, theta=155 deg., phi=45 deg. were at least 4 times faster.

To identify the problem I used callgrind profiler.

valgrind --tool=callgrind root.exe sim_emc.C

And the output can be viewed with kcachegrind.

Best regards,

Dima

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[Message index]

		backward endcap time consuming By: Dmitry Khaneft on Fri, 30 April 2010 13:29
		Re: backward endcap time consuming By: Dima Melnychuk on Fri, 30 April 2010 13:44
		Re: backward endcap time consuming By: Dima Melnychuk on Thu, 06 May 2010 12:04
		Re: backward endcap time consuming By: Dmitry Khaneft on Mon, 10 May 2010 10:28

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