MadGraph5_aMC@NLO

iseed changes

Asked by Olympia

Dear MadGraph team,

I have generate a process with 1000000 events using madgraph + pythia , actually I try to generate 10 different (the same process with different iseed) of 100000 events each. But I realized that every time that I change the iseed in the run_card it terns automatically to 0.
To be sure I checked the first event from every process ( their Px,Py,Pz) and I realized that are all identical! So in every process the iseed is 0 and the only difference is from Pythia.

My question is if there is some way to generate processes with different iseed or more convenient, if there is a way to produce 1000000 events in only one time.

Thank you in advance,
Olympia.

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Last query:
Last reply:
Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#1

Dear Olympia,

Can you provide more details on how you run the 10 successive computation?
Such that I can try to reproduce the problem and try to fix it.
I have try to simply launch the code 5 times, by setting the first time the seed different of zero and indeed (as expected) the iseed in the run_card is set back to zero. But the following computation are correctly done with increasing seed (as correctly indicated by the iseed value of the banner) and the events are different in each generation.

Otherwise one convenient way to run is to run the following command
./bin/madevent multi_run 10
which will run 10 successive identical run (but with different seed).

Cheers,

Olivier

Can you help with this problem?

Provide an answer of your own, or ask Olympia for more information if necessary.

To post a message you must log in.