SIONlib  2.0.0-rc.3
Scalable I/O library for parallel access to task-local files
Release notes & Copyright

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Release Notes

--> see http://www.fz-juelich.de/jsc/sionlib/

SIONlib Version 2.0.0-rc.3: (February 2021)

  • New features
    • Added a back-end based on Direct Data Network's (DDN) Infinite Memory Engine (IME) technology
    • Added a back-end based on SIONfwd for performing low-level I/O via I/O forwarding
    • Added a mechanism for selecting the low level I/O back-end via an environment variable (SION_LOWLEVEL_API)
    • Replaced the previous build system with one based on CMake
  • Updates
    • The example in examples/simple has been updated to work with the most recent API changes as well as the updates to sionconfig and the CMake config-file package.
  • IMPORTANT: This version introduces changes of some of the user-exposed API and internal behavior. Codes using previous versions of SIONlib need adaptations. See Porting from 1.7 to 2.0.

SIONlib Version 2.0.0-rc.2: (June 2019)

  • New features
    • Reading and writing amounts of data that exceed the size of a single chunk is now supported
    • sion_seek() can be used in write mode
  • Updates
    • API changed to more closely resemble common mechanisms like POSIX I/O
  • IMPORTANT: This version introduces changes of some of the user-exposed API and internal behavior. Codes using previous versions of SIONlib need adaptations. See Porting from 1.7 to 2.0.
    • The Fortran bindings are disabled by default and in fact cannot currently be built as they have not been adapted to the changes in the C API.

SIONlib Version 2.0.0-rc.1: (November 2018)

  • IMPORTANT: This version introduces changes of some of the user-exposed API and internal behavior. Codes using previous versions of SIONlib need adaptations. The most important user-visible changes are
    • File pointers are no longer exposed.
    • Write / read operations distribute their output / input automatically over multiple chunks. This means that a single call can write / read more than the chunk size given during the open call.

SIONlib Version 1.7.2: (April 2018)

  • Updates
    • Add support for GCC 7 and beyond
    • SIONlib is now compiled in strict C99 mode on compilers that support it
    • The test suite can now collect coverage data via gcov or kcov
  • Bugfixes
    • Fix an issue that could make read or write operations hang indefinitely
    • Make documentation of the do_swap (formerly aflag) parameter of sion_swap and its internal interpretation consistent

SIONlib Version 1.7.1: (November 2016)

  • Updates
    • Add support for GCC 6 to the build system
    • Add tests for the Fortran interface
  • Bugfixes
    • Fixed problems with missing symbols in the Fortran 90 OpenMP and hybrid interface
    • Fixed a duplicate typedef in public headers
    • Fixed a missing include in public headers

SIONlib Version 1.7.0: (October 2016)

  • New features
    • Added resiliency feature (buddy checkpointing)
      • See "Using SIONlib for Resiliency"
  • Updates
    • Parts of the documentation have been expanded
    • Fortran interface exports SION_SUCCESS
  • Bugfixes
    • Plugged memory leaks in error handling

SIONlib Version 1.6.2: (May 2016)

  • Updates
    • Parts of the documentation have been updated
  • Bugfixes
    • Fixed problem passing file system block size == 0
    • Fixed build problem on Cray (added missing file)

SIONlib Version 1.6.1: (November 2015)

  • New features
    • Added option to set SION_COLLSIZE during open call (instead of using the environment variable). (see Collective API)
    • Added possibility to seek relative to the end of a file
    • Added support for mpich3
    • Added new collective mode which drops data origin
      • Increases performance for collective writes
      • Can be used e.g. if data is self describing
      • See collective merge mode
    • Collective operations are now available for hybrid applications (OpenMP and MPI)
  • Updates
    • Updated documentation
    • Better support for K computer
    • Improved hybrid interface
    • Restructuring of interface layers
      • All parallel APIs (MPI, OpenMP and hybrid) now base on the generic API
  • Bugfixes
    • Fixed compatibility with GCC 5.X
    • Minor bugfixes

SIONlib Version 1.5.5: (March 2015) bug fix release

  • Updates/Bugfixes:
    • API change: int sion_get_sizeof(int sid) -> int sion_get_sizeof(int sid, int *numbytes, int *numfds)
    • bug fix: fixed problem in serial open of multifile and seeking with default position
    • memory optimization for key-value structures
    • optimization of paropen_mapped: reduced number of files opened
    • improved support for K Computer and Cray systems
    • added fsion_endianness_swap_needed(sid) convenience function to fortran

SIONlib Version 1.5.4: (January 2015)

  • New features:
    • added new options for key-value mode in
      • siondefrag
      • siondesplit
  • Updates/Bugfixes:
    • bug fix: removed memory leaks in key-value structures
    • bug fix: fixed problem with values exceeding chunk boundaries

SIONlib Version 1.5.3: (November 2014)

  • New features:
    • added new functions for locking in the generic interface
      • sion_lock_register_lock_callbacks
      • sion_lock_user_callbacks_defined
    • added new options to "siondump"
      • -k: print statistics about key-values for each task
      • -K: print list of key-values for each task
    • added convenience function "sion_endianness_swap_needed" for checking whether system and file endianness differ
    • added example par_mandel
  • Updates/Bugfixes:
    • improved support for K computer
    • fixed incorrect errors shown for "sioncat"
    • endianness will now be preserved by "siondefrag"
    • fixed typo in fortran interface ("endianess" to "endianness"), both now map to the same function
    • fixed issues in build system
    • fixed issues with "sion_dup"
    • fixed wrong error code of "sion_dedup"
    • fixed issues in key value mode
    • added svn revision to sionversion output

SIONlib Version 1.5.2: (September 2014)

  • Updates/Bugfixes 1.5.2:
    • fixed errormessages when reading keys in reversed order

SIONlib Version 1.5p1: (June 2014)

  • Updates/Bugfixes 1.5p1:
    • changes in fortran interface: size and number of elements changed from integer*4 to integer*8
    • added more checks of input parameters for sion_fread
    • changed open mode "r+" to increase performance

SIONlib Version 1.5rc1: (first release candidate April 2014)

  • New features in 1.5rc1:
    • change to Fortran-API: some parameter of function are changed to integer*8 (e.g. size and nitems of fsion_write())
    • key-value interface: changed to dense writing to chunks, meta data and data could be distributed to subsequent chunks
    • key-value interface: new iterator functions to read key,value pairs in write order
    • key-value interface: key-value moder is now stored in meta-data and will be reported by siondump
    • sion_dup: now available for generic and mapped interface
  • Updates/Bugfixes 1.5rc1:
    • bug fix: Removed further memory leaks
    • bug fix: fix problems with buffer mode

SIONlib Version 1.5beta1: (Mar 2014)

  • New features in 1.5beta1:
    • New key-value interface for saving data associated with a key, e.g. for saving data from different threads inside a single rank. The implementation features:
      • Simple interface
      • Works with generic mapped files
      • Stable ordering
      • Iterating over all available keys and values
  • Updates/Bugfixes 1.5beta1: bug fix: Removed memory leaks

SIONlib Version 1.4p3: (Nov 2013)

  • New features in 1.4p3:
    • New generic API to implement SIONlib API using own communication layer(s)
    • New API functions for open existent or create new SION files using different number of tasks in file and application (sion_paropen_mapped_mpi)
    • Language support for Fortran90
    • Language support for C++ (API preview)
  • Updates/Bugfixes 1.4p3:
    • Re-organization of libraries and header files: different libraries for MPI, OpenMPI, Hybrid, generic, serial use cases
    • Update Makefiles: make checkinst, make packinst, make depend, ...
    • return codes of functions are now defined with constants: SION_SUCCESS, SION_NOT_SUCCESS, SION_ID_UNDEF, SION_ID_NOT_VALID, SION_SIZE_NOT_VALID, ...
    • bug fix: Optimization for BG/Q: disable fsync
    • bug fix: thread-safe handling of sion file descriptor management
    • improved support for Cray system
    • bug fixes: Fortran length field, partest, packtest, ...

SIONlib Version 1.3p7: (March 2013)

  • New features in 1.3p7:
    • IBM BG/Q (optimisation for hybrid MPI/OpenMPI)
  • Updates/Bugfixes 1.3p7:
    • support for intelpoe and intel2 configuration
    • add more functions to Fortran API
    • bugfix: character length field for C-functions of Fortran API

SIONlib Version 1.3p5: (March 2012)

  • Updates/Bugfixes 1.3p5:
    • IBM BG/Q / Cray XK6 support
    • bug fixes

SIONlib Version 1.3p4: (Aug 2011)

  • New features in 1.3p4:
    • new tool: sionversion: shows version number
    • more support for collective write/read functions
  • Updates/Bugfixes 1.3p4:
    • internal optimization, if fileptr is not used by application
    • bug fixes

SIONlib Version 1.3p2: (July 2011)

  • New features in 1.3p2:
    • SION debug supports now OpenMP
  • Updates/Bugfixes 1.3p2:
    • sionconfig changed for Linux default, library name contains now precision
    • sion_fread: check feof before read data, move to next chunk if necessary
    • correct handling of second_fp, needed for compression libraries
    • serial read fileptr parameter was not set in each case

SIONlib Version 1.3p1: (June 2011)

  • New features in 1.3p1:
    • Support for OpenMP and hybrid programs (MPI+OpenMP)
    • internal I/O layer using POSIX or ANSI-C calls
    • experimental: collective I/O (MPI)
    • partest: new option handling
  • Updates/Bugfixes 1.3p1:
    • several fixes

SIONlib Version 1.2p2: (May 2010)

  • New features in 1.2p2:
    • Multi-File support in serial tools and API
    • New installation process with configure tool
    • make test (serial and parallel)
    • New serial tool: sioncat
  • Updates/Bugfixes 1.2p1:
    • Restructured source code
    • sion.h cleaned, contains now only public interface
    • several fixes

SIONlib Version 1.1p9: (November 2009)

  • Updates/Bugfixes 1.1p9: -Fortran interface updated

SIONlib Version 1.1p8: (November 2009)

  • 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)

  • 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)
  • 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