libpressio version 0.37.0

libpressio version 0.37.0

Major Changes

• Several improvements to the external metrics module
  • The external metric module now always provides paths to files as
    absolute paths rather than relative paths.
  • Introduced the concept of launch_methods to provide multiple
    methods to launch the external metric script. Refactored existing
    launch method out as forkexec. This is because some HPC clusters do
    not allow you to spawn processes from MPI jobs using fork+exec.
  • Added the mpispawn launch method which is built if MPI is
    available. This allows the spawning of processes which would
    otherwise segfault or error when the child process uses MPI and the
    parent process also uses MPI.
  • Improved documentation of the current behavior by documenting error
    codes.

Bug Fixes

• fixed a bug in the petsc io module which caused a segmentation fault
  by allocating memory before using an undefined object
• Exposed functionality added to the external metric module in 0.36.0
  which was unusable without being exposed.

libpressio version 0.36.0

libpressio version 0.36.0

Major Changes

• All of the compressors, metrics, and io_modules can now have their
  options prefixed. By default compressors use an empty prefix, but
  meta-compresssors/metrics will set a prefix for their children. This
  is to allow for compressors to set a hierarchy of options. Unprefixed
  options will now be treated as "global" options and will be checked by
  all compressors, metrics, and io_modules.
• New C functions have been added to set the prefixes on metrics,
  compressors, and io modules.
• BREAKING CHANGE: if you used composite metrics (if you used metrics
  you have used it) or any meta-compressor
  (resize/transpose/log_transform), the options returned from
  the for the C api have changed by default to be prefixed according to
  the new naming system (see below). This shouldn't be a problem unless
  you are using cast_set because compressors will still accept the old
  arguments.
• BREAKING CHANGE: external metrics scripts much now also provide a zero
  "well-known" argument version that provides an exemplar of each set of
  results so that the type and names can be determined. These values
  will also be passed as "defaults" if the script doesn't print all
  options.
• A new version of the external metrics API has been introduced that
  will eventually allow for the introduction of metrics that have multiple
  datafiles. Additionally, external metrics can now set IO options per
  file.
• LIBRARY BREAKING CHANGE: to support the new prefixing, compressors, metrics,
  and io modules must use the new set and get functions provided by
  pressio_configurable to get and set options to support prefixing.
• LIBRARY BREAKING CHANGE: to support new base classes and make
  interfaces more consistent,
  libpressio_metrics_plugin::get_metrics_options is now called
  libpressio_metrics_plugin::get_options and
  libpressio_metrics_plugin::set_metrics_optionsis now calledlibpressio_metrics_plugin::set_options` the corresponding functions for
  configuring metrics on the compressors are unchanged.

Minor Changes

• the C++ code has been cleaned up by introducing some superclasses for
  compressor, metrics, and io plugins that was consistent between them.
  The new classes are pressio_configuable, pressio_errorable, and
  pressio_versionable.
• To implement the new functionality, all pressio_configuable
  subclasses now provide a prefix.
• Documentation and test cases were updated to use option setting
  mechanics.
• Some improvements to the example of a meta-compressor which simplify
  the code from lessons learned writing pressio-opt.

Bug Fixes

• conversion from empty strings to numeric values have been disallowed
  and now return an empty option rather than a segfault
• the fpzip plugin now correctly casts pressio_thread_safety to an
  integer.

libpressio version 0.35.0

libpressio version 0.35.0

Major Changes

• New api, pressio_data_transpose which transposes a data object
• 2 new meta compressors, resize and transpose which apply a resize or
  transpose operation before running compression
• A new lossy compressor "sample" which preforms a by-row sampling of
  the data
• Changed the implementation of metrics to allow for better safety when
  the decompressed data that is not the same size as the original data
  (i.e. when sampling).
• A new metric, relative spatial error has been introduced used in the
  climate community.

Bug fixes:

• documented some previously undocumented functions

libpressio version 0.34.4

libpressio version 0.34.4

Bug Fixes:

• previously, pressio_data objects would incorrectly report that an
  empty buffer had data_size == 1, which caused a host of issues with
  these objects. All of them have been fixed.
• the ZFP-plugin previously would cause a double-free if copied. This
  has been resolved, by following the rule of 5
• the ZFP-plugin would read uninitialized memory if it wasn't configured
  prior to calling set_options with some options information. It is now
  initalized to a default state.
• the ZFP plugin would previously fail to decompress if using the OpenMP
  mode requiring a reconfiguration between compression and decompression.
  Since this isn't expected, we save the mode, use serial mode, then
  restore to the previous mode.
• the SZ plugin used enable_shared_from_this in an undefined way. Now
  the code relies upon the default plugin mechanics in libpressio to get
  another handle to the same shared object.

libpressio version 0.34.3

libpressio version 0.34.3

• Bug Fix: Previously, when clone was introduced, it would not also clone
  the metrics object associated with a particular compressor plugin. This
  was unintended. Now, the metrics object is cloned to improve thread
  safety

libpressio version 0.34.2

libpressio version 0.34.2

• Bug Fix: previous the sz plugin had an erronous space at the end of an
  option string. This may break usage of the sz:quantization_bins
  option.

libpressio version 0.34.1

libpressio version 0.34.1

Bug Fixes

• WARNING: the fpzip previously had several flaws that would cause it to
  not produce correct compression results and not be able to decompress
  data. These have been resolved, but all results produced with the
  previous versions of this plugin should be discarded.
• the CSV generic IO modules is now orders of magnitude faster by using
  more efficient methods to construct the buffer.

libpressio version 0.34.0

libpressio version 0.34.0

Major Changes:

• Added support for PETSC format to generic IO
• Added support for CSV format to generic IO
• Added support to clone compressors/io/metrics modules

Bug fixes

• Various bug fixes to POSIX IO that prevented it from working correctly
  in C++11

libpressio version 0.33.0

libpressio version 0.33.0

Major Changes

• Added a noop IO module to make it easier to disable IO
• Added supported_metrics() and supported_io() methods to struct pressio for symmetry
• Added pressio_supported_metrics() methods
• BREAKING CHANGE: pressio_supported_compressors() now returns
  a static string based on what is found in the registry. While this
  should normally be the consistent with LIBPRESSIO_COMPRESSORS, it
  won't include external compressors. This change better conforms with
  the documented and intended behavior.

Bug Fixes:

• The POSIX pressio_io_data_fwrite function now correctly returns the
  number of bytes written as documented. Previously it returned the
  number of objects written.
• The POSIX io module now returns error messages on failures
• the POSIX io module no longer initializes file_ptr to nullptr to avoid
  a bug where it is intentionally set.

libpressio version 0.32.0

libpressio version 0.32.0

Major Changes

• Introduced the concept of Generic IO as a new concept and extension
  point. The existing HDF5 and POSIX formats are supported in Generic
  IO. Test cases and documentation were added to support this use case.
  At this point, General IO will not replace the existing IO functions.
  Existing IO functions MAY be deprecated in a upcoming release once the
  Generic IO features have had time to stabilize.
• External Metrics version 2 now supports using generic IO to output the
  files for analysis.
• pressio_data and pressio_options now take a std::initalizer_list as a
  constructor to make it easier to construct these types in testing and
  script-like code. This means that these data structures are no longer
  trivially constructable.

Minor Changes

• Some internal code was refactored to use newer interfaces.