Time required to generate observations in Dynare 4

[Ansgar]

Dear all,
I have been wondering for a long time about the following. When I simulate my model over 200000 periods in order to generate observations to calculate the sample moments, it takes ages in Dynare 4, about 2 hours. By contrast, in Dynare 3, it takes 4 minutes. I am solving the model using the second order approximation to the policy function.
Did any of you encounter the same thing?
Best,
Ansgar

[StephaneAdjemian]

Hi Ansgar,

The difference between dynare v3 and v4 is that the last version simulates (by default) fifty times the same model with 200000 periods... I guess this is not what you want (but this may be useful in some cases). The problem was corrected under dynare 3 but not under version 4. The problem is that we use the same variable (options_.replic equal to 50 by default) for different purposes... We will correct this bug as soon as possible.

Meanwhile, if you are not interested in IRFs, a workaround is to add the following options in the stoch_simul : replic = 1. If you are also interested in IRFs with a second order approximation you have to call again stoch_simul with options (say) irf=40 and replic=50.

Best,
Stéphane.

Dear all,
I have been wondering for a long time about the following. When I simulate my model over 200000 periods in order to generate observations to calculate the sample moments, it takes ages in Dynare 4, about 2 hours. By contrast, in Dynare 3, it takes 4 minutes. I am solving the model using the second order approximation to the policy function.
Did any of you encounter the same thing?
Best,
Ansgar

[Ansgar]

Hey Stephane,
many thanks for your reply! I have used the replic option and it now works in acceptable time!
Best,
Ansgar