Hi, I am using MadGraph5_aMC@NLO version 2.4.3 and have the following issue: If I have two identical output directories and I set '5 = iseed' in both respective run_cards and generate events, I do get the same cross sections in both cases but not the same parton event files. Note that I am _not_ talking about run01-events and run02-events, for which - I guess - this behaviour expected. I am talking about performing the same "generate xy; launch" command chain with the same Cards with a constant iseed and not getting the same .lhe file. As an example, I just entered in the mg5_aMC@NLO executable import model mssm generate p p > t1 t1~ output myfolder_1 generate p p > t1 t1~ output myfolder_2 changed "iseed" to 5 in both myfolder_1/Cards/run_card.dat and myfolder_2/Cards/run_card.dat" and did launch myfolder_1 and launch myfolder_2 in two separate mg5_aMC@NLO calls. In both cases, my .lhe files yield # Number of Events : 10000 # Integrated weight (pb) : 1.25687 however, the first event of _1 reads 4 1 +1.2568700e-04 7.35083500e+02 7.81653100e-03 9.65904700e-02 2 -1 0 0 502 0 +0.0000000000e+00 +0.0000000000e+00 +8.1321269988e+02 8.1321269988e+02 0.0000000000e+00 0.0000e+00 1.0000e+00 -2 -1 0 0 0 501 -0.0000000000e+00 -0.0000000000e+00 -7.0716068191e+02 7.0716068191e+02 0.0000000000e+00 0.0000e+00 -1.0000e+00 1000006 1 1 2 502 0 -5.9012349439e+02 +1.7990870062e+02 -1.3377345332e+02 7.4715669434e+02 3.9966850000e+02 0.0000e+00 0.0000e+00 -1000006 1 1 2 0 501 +5.9012349439e+02 -1.7990870062e+02 +2.3982547128e+02 7.7321668745e+02 3.9966850000e+02 0.0000e+00 0.0000e+00 2 0.73508353E+03 0 1 2 0.12510965E+00 0.73508353E+03 1 -2 0.10879395E+00 0.73508353E+03 0.23103930E+01 while the first event of _2 reads 4 1 +1.2568700e-04 6.24461900e+02 7.81653100e-03 9.85591600e-02 21 -1 0 0 501 502 +0.0000000000e+00 +0.0000000000e+00 +1.5460202741e+02 1.5460202741e+02 0.0000000000e+00 0.0000e+00 -1.0000e+00 21 -1 0 0 502 503 -0.0000000000e+00 -0.0000000000e+00 -2.5378515457e+03 2.5378515457e+03 0.0000000000e+00 0.0000e+00 -1.0000e+00 1000006 1 1 2 501 0 +4.7434292918e+02 -7.2225588078e+01 -1.0862406926e+03 1.2529451313e+03 3.9966850000e+02 0.0000e+00 0.0000e+00 -1000006 1 1 2 0 503 -4.7434292918e+02 +7.2225588078e+01 -1.2970088257e+03 1.4395084418e+03 3.9966850000e+02 0.0000e+00 0.0000e+00 2 0.62446190E+03 0 1 21 0.23784927E-01 0.62446190E+03 1 21 0.39043870E+00 0.62446190E+03 0.11400585E+02 If this is true (and I didn't do a mistake), this behaviour is quite unfortunate, because we'd like to do the MG5_aMC@NLO event generation within CheckMATE and we are very keen in beeing able to reproduce results by fixing random seeds. (Otherwise fixing these seeds wouldn't make sense anyway). Cheers, Daniel

When	Who	Action	New State
2016-11-02	Olivier Mattelaer	Answer	Answered
2016-11-02	Daniel	Confirm	Solved
2016-11-02	Daniel	Confirm	Solved
2017-08-07	angelo	Comment	Solved
2017-08-07	Olivier Mattelaer	Comment	Solved

MadGraph5_aMC@NLO

History of question #403733