## SIONlib: Scalable I/O library for parallel access to task-local files

### Copyright

Copyright (c) 2008-2009, Forschungszentrum Juelich GmbH, Federal Republic of Germany
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

- Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
- Neither the names of Forschungszentrum Juelich GmbH, nor the names of their contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

### Release Notes

#### sionlib Version 1.1p9: (November 2009)

- --> see http://www.fz-juelich.de/jsc/sionlib/
- - Updates/Bugfixes 1.1p9:
  - Fortran interface updated

#### sionlib Version 1.1p8: (November 2009)

- --> see http://www.fz-juelich.de/jsc/sionlib/
- - New Features in 1.1p8:
  - new option -X to partest: remove files after using
- - Updates/Bugfixes 1.1p8:
  - bug fix: determines now right physical file distribution if local commicator is used and global rank 0 is different to local rank 0
  - bug fix in siondump: print now correct filename for first file
  - removed double open of file for write in sion_open
  - fixes for performance improvements on IBM Blue Gene/P

#### sionlib Version 1.1p7: (September 2009)

- - New Features in 1.1p7:
  - additional function to get information about SION-file (e.g. sion_get_current_location, sion_get_bytes_written, sion_get_bytes_read)
  - error handling enhanced
  - Fortran interface enhanced
  - siondump: new option -m (print map)
  - partest: new option -Z offset, read data from other task to prevent cache effect in measurement
- - Updates/Bugfixes 1.1p7:
  - more tests on different platforms
  - fixes for performance improvements on IBM Blue Gene/P
  - partest: increased MAX_PE to 288k

#### sionlib Version 1.1p6: (May 5th 2009)

- --> see http://www.fz-juelich.de/jsc/sionlib/
- - New Features in 1.1p6:
  - new wrapper functions sion_fwrite, sion_fread (beta)
  - automatic determination of file system block size, if parameter is -1

#### sionlib Version 1.1p5 (beta): (February 4th 2009)

- - first down-loadable version 1.1p5 of sionlib (beta)
  --> see http://www.fz-juelich.de/jsc/sionlib/
- - New Features in 1.1p5:
  - Multifile option (one sionfile consists of serveral phsical files) is implemented and tested
  - Fortran Interface is implemented and tested
  - parallel benchmarking programs partest and fpartest for sionlib and MPI/IO available
  - sionlib with Fortran Interface is used in production code PEPC
  - Doxygen documentation available
  - simple parallel example program,
  - serial utilities: sionsplit, siondump and sionmerge
  - examples programs for converting application specific data to sionlib files
- - Tests:
- tests on Blue Gene/P up to 64k cores, 2 TB files --> 90% of Peak bandwidth
- tests on IBM Power 6 and Linux-Systems
- first functional tests on Cray XT4