MPI - IO - Prace Training Portal

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Data sieving• Multiple small I/O requests are satisfiedwith a single larger contiguous callrelative ROM<strong>IO</strong> hints:romio_ds_writeromio_ds_readind_rd_buffer_sizeind_wr_buffer_sizedetermine whether data sieving will beperformed for writes and reads(values: enable, disable, auto)control the size of intermediate buffer of datasieving for read and write operations in bytes
Two phase collective buffering• First phase: Access is performed by a group of processes (aggregators)• Second phase: Data is moved to final destinationsrelative ROM<strong>IO</strong> hints:romio_cb_writeromio_cb_readcb_buffer_sizecb_nodesdetermine whether collective buffering will beperformed for writes and reads(values: enable, disable, auto)controls the size of the intermediate buffer usedin two phase collective I/O in bytescontrols the maximum number of aggregators tobe used
Page 1 and 2: MPI - IO
Page 3 and 4: Sequential I/Oprocess 0 process 1 p
Page 5 and 6: Parallel I/O to a single shared fil
Page 7 and 8: Simple Execution OrderMPI_Info_crea
Page 9 and 10: PositioningCoordinationSynchronizat
Page 11 and 12: Contiguous - Non Contiguous I/OProc
Page 13 and 14: Collective - Independent I/0p0p1 p2
Page 15: Non-Blocking MPI-IO functionsWRITER

MPI - IO - Prace Training Portal

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