Optimizing NLO merged/matched calculation on cluster
Hi,
I am trying to generate 300K events for the process tt+0,1,2 jets @ NLO merged and matched to a parton shower, using MadSpin to decay particles. I am running it into a big cluster. I managed to generate, as a test, 10K events: it took around 7 hours. I was worried that to generate 300K events it would take ages.
The compilation, the grid setup, the upper envelope and the event generation took "just" around 14 hours. For 300K events I set nevt_job=2000, such that the main job would submit a lot of secondary job, in order to speed up the computation.
The decay part and the shower part work on just one core, instead. Since for 10k events Madspin took just 6 minutes to decay events, I expected that for 300k events it would take around 3 hours. Instead, after 3 hours it decayed only 40k events. The pace was 10k events/50 minutes.
How can I improve the whole event generation? I would like to be able to generate 1M events, also because the number of events after the parton shower is around 1/3 of the original one.
Thank you in advance.
Cheers,
Michele
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