Pause/restart simulation

Hashan Mendis

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Dec 21, 2015, 2:24:48 PM12/21/15

to python-simpy

Hi,

I am a research student using SimPy for multicore resource management simulations. Have been using SimPy 3.0.5 for a while now.

Does SimPy have capability to pause/restart simulations ? restart - meaning if a simulation crashes for some reason, to restart from the crash point ?

Many thanks
Rosh

Stefan Scherfke

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Dec 22, 2015, 1:24:30 PM12/22/15

to Hashan Mendis, python-simpy

Hi Rosh,

unfortunately, this is not possible. SimPy relies heavily on Python
generators and you can not (re)store a certain state for generators (you
cannot even pickle them).

Maybe you can find a workaround by storing the state state of your processes
(e.g. from instance attributes) and manually restoring it.

Cheers,
Stefan

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James Arruda

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Dec 30, 2015, 11:07:10 AM12/30/15

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Why are you trying to restart? Or rather, what is the cause of the crash?

You can use a random seed to make your code deterministic and repeatable, so if you have a failure of some kind you can redo all the exact same steps. That would only work if you don't have external data sources or interfaces that are beyond your control (can't be seeded).

You can easily create a numpy random object with a given seed: http://stackoverflow.com/a/5837352/3491531 and share that object with your simulation objects.

James

徐倩

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May 8, 2018, 10:51:45 PM5/8/18

to python-simpy

Hi, I am also interested in restart simulation. I want to pause the simulation and change its schedule path and restart it again, like rerouting in computer network. Have you found any available solution for this? Thanks!