1. 12 Oct, 2018 1 commit
    • Kirill Smelkov's avatar
      bigarray: RAMArray · fc9b69d8
      Kirill Smelkov authored
      RAMArray is compatible to ZBigArray in API and semantic, but stores its
      data in RAM only. It is useful in situations where ZBigArray compatible
      data type is needed, but the amount of data is small and the data itself
      is needed only temporarily - e.g. in a simulation.
      
      Implementation is based on mmapping temporary files from /dev/shm/... and
      passing them as file handles, similarly to how ZBigArray works, to BigArray.
      We don't use just numpy.ndarray because of append - for ZBigArray append
      works in O(1), but more importantly it does not copy data. This way
      mmapings previously created for ZBigArray views, continue to correctly
      alias array data. If we would be using ndarray directly, since
      ndarray.resize copies data, that property would not be preserved.
      
      Original patch by Klaus Wölfel <klaus@nexedi.com>
      (nexedi/wendelin.core!8)
      fc9b69d8