write and read the (sparse grid) data in lz4 format:
each rank in the output communicator writes its own data to a frame, as slice in the output file. The first rank, additionaly, writes a header frame containing the file offsets as very first frame. This way, when decompressing each rank will know where to read.
write and read the (sparse grid) data in lz4 format: each rank in the output communicator writes its own data to a frame, as slice in the output file. The first rank, additionaly, writes a header frame containing the file offsets as very first frame. This way, when decompressing each rank will know where to read.