Denis

OK will do !

For now our cluster is really busy ... i am afraid we must wait for output

In attachment the debug output corresponding to successful run using only [pog_50228986.out.gz](https://github.com/ComputationalRadiationPhysics/picongpu/files/8709809/pog_50228986.out.gz) 1 GPU

In attachment the debug output corresponding to a failed WarmCopper run triggering out-of-memory error. [pog_50346420.out.gz](https://github.com/ComputationalRadiationPhysics/picongpu/files/8714183/pog_50346420.out.gz)

I managed to solve the issue related to `hipErrorOutOfMemory` problem changing the number of `cores/MPI` and the maximum memory to device i.e ``` # host memory per device .TBG_memPerDevice=64000000 #...

Something strage is that the last verbose output is showing: ``` PIConGPUVerbose INPUT_OUTPUT(32) | openPMD: global JSON config: {"hdf5":{"dataset":{"chunks":"none"}}} PMaccVerbose MEMORY(1) | DataConnector: sharing access to 'MallocMCBuffer' (1 uses) PIConGPUVerbose...

@sbastrakov it actually works, the problem was linked to the proper configuration of `ADIOS` backend !

I have this warning tough in the `.err` output, may be you know what this means? ``` Warning: ADIOS2 backend does not support compression method blosc. Continuing without compression. ```

@sbastrakov it will be advantageous to use data compression in our case, we are using a `Lustre` filesystem. What does exaclty `blosc` ? can ADIOS2 use other kind of compression...

> For compression: Running `cmake .` in the build folder of ADIOS2 should give you the available options. The documentation for the openPMD plugin in PIConGPU linked above includes an...