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Upgrade Guide

0.10.0-alpha

We added support for ADIOS2 in this release. As soon as the ADIOS2 backend is enabled it will take precedence for .bp files over a potentially also enabled ADIOS1 backend. In order to prefer the legacy ADIOS1 backend in such a situation, set an environment variable: export OPENPMD_BP_BACKEND="ADIOS1".

0.9.0-alpha

We are now building a shared library by default. In order to keep build the old default, a static library, append -DBUILD_SHARED_LIBS=OFF to the cmake command.

0.7.0-alpha

Python

Module Name

Our module name has changed to be consistent with other openPMD projects:

# old name
import openPMD

# new name
import openpmd_api

store_chunk Method

The order of arguments in the store_chunk method for record components has changed. The new order allows to make use of defaults in many cases in order reduce complexity.

particlePos_x = np.random.rand(234).astype(np.float32)

d = Dataset(particlePos_x.dtype, extent=particlePos_x.shape)
electrons["position"]["x"].reset_dataset(d)

# old code
electrons["position"]["x"].store_chunk([0, ], particlePos_x.shape, particlePos_x)

# new code
electrons["position"]["x"].store_chunk(particlePos_x)
# implied defaults:
#                         .store_chunk(particlePos_x,
#                                      offset=[0, ],
#                                      extent=particlePos_x.shape)

load_chunk Method

The loadChunk<T> method with on-the-fly allocation has default arguments for offset and extent now. Called without arguments, it will read the whole record component.

E_x = series.iterations[100].meshes["E"]["x"]

# old code
all_data = E_x.load_chunk(np.zeros(E_x.shape), E_x.shape)

# new code
all_data = E_x.load_chunk()

series.flush()

C++

storeChunk Method

The order of arguments in the storeChunk method for record components has changed. The new order allows to make use of defaults in many cases in order reduce complexity.

std::vector< float > particlePos_x(234, 1.234);

Datatype datatype = determineDatatype(shareRaw(particlePos_x));
Extent extent = {particlePos_x.size()};
Dataset d = Dataset(datatype, extent);
electrons["position"]["x"].resetDataset(d);

// old code
electrons["position"]["x"].storeChunk({0}, extent, shareRaw(particlePos_x));

// new code
electrons["position"]["x"].storeChunk(particlePos_x);
/* implied defaults:
 *                        .storeChunk(shareRaw(particlePos_x),
 *                                    {0},
 *                                    {particlePos_x.size()})  */

loadChunk Method

The order of arguments in the pre-allocated data overload of the loadChunk method for record components has changed. The new order allows was introduced for consistency with storeChunk.

float loadOnePos;

// old code
electrons["position"]["x"].loadChunk({0}, {1}, shareRaw(&loadOnePos));

// new code
electrons["position"]["x"].loadChunk(shareRaw(&loadOnePos), {0}, {1});

series.flush();

The loadChunk<T> method with on-the-fly allocation got default arguments for offset and extent. Called without arguments, it will read the whole record component.

MeshRecordComponent E_x = series.iterations[100].meshes["E"]["x"];

// old code
auto all_data = E_x.loadChunk<double>({0, 0, 0}, E_x.getExtent());

// new code
auto all_data = E_x.loadChunk<double>();

series.flush();