Hi,
this is linked to the error reported here: Seed number error
I got the G4Exception : Run0115 in my simulation and was able to reproduce it with a standard example.
System: “Debian GNU/Linux 12 (bookworm)”
Geant4-11-1-2
example basic B1
run 1
modify run1.mac to r1.mac (no eventModulo) r1_mac.txt (540 Bytes)
execute:
env G4FORCE_GRAINSIZE=64 ./exampleB1 r1.mac >file1.log 2>file1.err
→ G4FORCE_GRAINSIZE=64 does not work
run 2
modify run1.mac to r2.mac (too large eventModulo second parameter=0) r2_mac.txt (539 Bytes)
execute:
env G4FORCE_GRAINSIZE=64 ./exampleB1 r2.mac >file2.log 2>file2.err
→ G4FORCE_GRAINSIZE=64 works
In G4TaskRunManager::ComputeNumberOfTasks() in G4TaskRunManager.cc at line 334 only if eventModulo > nEvtsPerTask the effect of G4FORCE_GRAINSIZE is realized!
Same if second parameter=1 in /run/eventModulo
run 3
modify run1.mac to r3.mac (too large eventModulo second parameter=0 and large number of events) r3_mac.txt (542 Bytes)
execute:
env G4FORCE_GRAINSIZE=64 ./exampleB1 r3.mac >file3.log 2>file3.err
→ G4FORCE_GRAINSIZE=64 works
→ but ERROR:
G4WT4 >
-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : Run0115
issued by : G4RNGHelper::GetSeed
No seed number 15464(15464 available)
Original seed number -311832 filled so far 2147320000
*** Fatal Exception *** core dump ***
G4WT4 > **** Track information is not available at this moment
G4WT4 > **** Step information is not available at this moment
G4WT4 >
-------- EEEE -------- G4Exception-END --------- EEEE -------
G4WT4 >
G4WT4 > *** G4Exception: Aborting execution ***
Similar behavior was posted here:
Seed number error
I think it is cause due to an integer overflow in G4TaskRunManager::SetUpNEvents in line 702
seedsQueue->push(helper->GetSeed(nSeedsPerEvent * nSeedsUsed));
In G4TaskRunManager.cc in line 702:
nSeedsPerEvent * nSeedsUsed = 2 * 2147327732 = 4294655464
In G4RNGHelper.hh in line 66:
G4int seedId = sdId - 2 * offset;
=> seedId=15464
=> offset=2147320000
=> sdId=-311832 here is the integer overflow !
Due to 4294655464 which is
bin(4294655464)=0b11111111111110110011110111101000 which becomes int32(0b11111111111110110011110111101000)=-311832
This integer overflow happens despite the number of events is /run/beamOn 2147327732 is less than 2**31 !
run 4
modify run1.mac to r4.mac (too large eventModulo second parameter=1 and large number of events) r4_mac.txt (542 Bytes)
execute:
env G4FORCE_GRAINSIZE=64 ./exampleB1 r4.mac >file4.log 2>file4.err
→ G4FORCE_GRAINSIZE=64 works
→ but simulation get stucked with message from each thread like this:
G4WT38 > Applying command " " @ ProcessOneEvent:251
Best regards
henk