# Restart simulation with different resources
**URL:** https://pyfr.discourse.group/t/restart-simulation-with-different-resources/798
**Category:** Development
**Created:** [16 April 2023 07:12 UTC](https://pyfr.discourse.group/t/restart-simulation-with-different-resources/798 "2023-04-16T07:12:18Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Frankx9](https://pyfr.discourse.group/u/Frankx9)
#### Post date: [16 April 2023 07:12 UTC](https://pyfr.discourse.group/t/restart-simulation-with-different-resources/798/1 "2023-04-16T07:12:18Z")
Hi,
is there any plan on allowing a restart of a given simulation using different resources (i.e. number of partitions)?
Say, for example, that I’m running with cuda with X GPUs and want to switch to openmp with Y CPUs
Regards
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### Author:  [@fdw](https://pyfr.discourse.group/u/fdw)
#### Post date: [16 April 2023 17:18 UTC](https://pyfr.discourse.group/t/restart-simulation-with-different-resources/798/2 "2023-04-16T17:18:32Z")
I’m not sure what you mean?
As noted in the documentation you can use `pyfr partition` to repartition a mesh and associated solution files. You may then restart using these repartitioned mesh/solution files.
Regards, Freddie.
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### Author:  [@Frankx9](https://pyfr.discourse.group/u/Frankx9)
#### Post date: [17 April 2023 05:39 UTC](https://pyfr.discourse.group/t/restart-simulation-with-different-resources/798/3 "2023-04-17T05:39:18Z")
When using rk45, for example, do I have to repartition not only the \*.pyfrm file but also the latest 4 \*.pyfrs files?
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### Author:  [@WillT](https://pyfr.discourse.group/u/WillT)
#### Post date: [17 April 2023 07:56 UTC](https://pyfr.discourse.group/t/restart-simulation-with-different-resources/798/4 "2023-04-17T07:56:42Z")
No, RK methods don’t use the time history in the interpolation, that’s there advantage. The RK integration only requires a single solution and then takes a series of substeps, these get stored and used to build the next sub step.
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### Author:  [@Frankx9](https://pyfr.discourse.group/u/Frankx9)
#### Post date: [17 April 2023 10:23 UTC](https://pyfr.discourse.group/t/restart-simulation-with-different-resources/798/5 "2023-04-17T10:23:48Z")
Got it!
As always, very grateful for the help!