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    • For best performance, the chunk cache size should be equal to or greater than the chunk size for a dataset. If the chunk cache size is smaller than the dataset's chunk size it will be ignored and the chunks read directly from disk. This can cause spectacularly and unnecessarily poor performance in cases where an application repeatedly reads small sections of the same chunk, since each of those reads requires reading the entire chunk from the disk. If the chunk is compressed the performance problem is compounded because the entire chunk must be decompressed for each read. The chunk cache size can be modified with the H5P_SET_CHUNK_CACHE call.

      Also be aware that if a dataset is read by whole chunks and there is no need to access the chunks more than once on the disk, the chunk cache is not needed and can be set to 0 if there is a shortage of memory.