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Darshan Release Change Log
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darshan-2.2.6-pre1
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* Bug fix: make sure to honor any user-specified hints passed in at runtime
  via the DARSHAN_LOGHINTS env variable.
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* Add instrumentation of startup time, enabled via DARSHAN_INTERNAL_TIMING
  environment variable
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* Rename cp-shutdown-bench test utility to darshan-shutdown-bench and enable
  benchmarking hooks in library by default so that darshan-shutdown-bench 
  can be used with any Darshan installation.
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* Change default MPI-IO hints for writing log file to
  romio_no_indep_rw=true and cb_nodes=4 to improve log creation performance
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darshan-2.2.5
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* Fix bug in mount point identification when --enable-stat-at-open option is
  not used.  In Darshan 2.2.4, some file entries were recorded as using the "/"
  file system regardless of their location.
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* Update patches and documentation for Cray xt-asyncpe environment 5.12 or 
  higher; contributed by Yushu Yao.
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* Update documentation to no longer recommend --enable-stat-at-open option on 
  any systems
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* Fix unresolved symbols error when linking non-MPI programs with Cray
  compiler.  Reported by Yushu Yao.
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* Use fstat() in place of stat() for detecting file information when
  --enable-stat-at-open option is used
* Use statfs() at startup to detect default block size for supported file
  systems
* Added --enable-group-readable-logs configure option, which will cause
  Darshan to to generate log files with the group read permission bit set.
  This option is useful in conjunction with deployments that set the setgid
  bit on log directories.
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darshan-2.2.4
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* Disable extra stat() of newly opened files by default.  This improves 
  performance on shared files for some platforms.  Reported by Yushu Yao.
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  - prevents Darshan from reporting SIZE_AT_OPEN, FILE_ALIGNENT, and 
    DARSHAN_FILE_NOT_ALIGNED values
  - features can still be enabled via --enable-stat-at-open option
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* Fix missing -lz in post ld flags reported by Yushu Yao.  Fixes a link-time
  error for some corner-case applications.
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* Fix bug in Cray compiler script patches that was setting compiler flags 
  incorrectly.  Reported by Yushu Yao.
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  WARNING: if you are using a previous Darshan release (2.2.3 through
  2.2.4-pre4) on a Cray platform, please re-patch your compiler scripts.
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* Update darshan-gen-* scripts to support the potential for additonal LDFLAGS
  or CFLAGS that appear before the object or source file in the compile or
  link commands.  This fixes compatibility with some mvapich2 installations,
  reported by Dragos Constantin.
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darshan-2.2.3
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* improved Cray XE6 support
  - support for GNU, PGI, Cray, Pathscale, and Intel compilers
  - patch adding Darshan capability to system compiler scripts
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  - software module, including testing and features contributed 
    by Yushu Yao and Katie Antypas of The National Energy Research 
    Scientific Computing Center (NERSC)
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  - improved documentation
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* minor bug fixes:
  - properly detect cxx library name when generating BG/Q compiler wrappers
  - improve timing mechanism for cp-shutdown-bench benchmark
  - improve hashing to avoid log file name collisions
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darshan-2.2.2
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* bug fixes:
  - remove debugging message that was inadvertently included in
    MPI_File_sync() wrapper
  - fix potential hang if the --with-log-path-by-env argument was used at 
    configure time but the environment variable was not set at run time

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darshan-2.2.1
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* significant improvements to how counters are handled in multi-threaded
  applications
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* initial (rough) documentation for using Darshan in Cray
  programming environments with static linking
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* bug fixes:
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  - escape special characters in mount point paths in darshan-job-summary.pl
    (reported by Mouhamed Gueye)
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  - workarounds for various runtime problems with cuserid() and stat() in  
    Cray environments
  - build problems with darshan-utils on some versions of OSX
  - accurate shared file statistics for libraries that use deferred opens

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darshan-2.2.0
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* split darshan into separate packages:
  - darshan-runtime: for runtime instrumentation
  - darshan-utils: for processing darshan log files
* changed default output file name for darshan-job-summary.pl to be based on
  input file name rather than summary.pdf
* reorganized init and finalize routines so that can be linked separately (to
  allow for easier integration with other instrumentation tools)
* add -cc, -cxx, -f77, -f90, and -fc support to compiler scripts generated by
  the darshan-gen-*.pl scripts
* bug fixes:
  - potential MAX_BYTE overflow on 32 bit systems
  - incorrect pread and pwrite offset tracking
  - corrections to darshan-job-summary variance table
  - better runtime error handling if bzip or gnuplot tools are insufficient
  - improvements to time range in darshan-job-summary graphs
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* documentation:
  - improved documentation for both the darshan-runtime and darshan-util
  portions of Darshan can be found in the respective doc/ subdirectory for
  each
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darshan-2.1.2
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* improved error handling when writing log files.  If a write fails then the
  log file will be deleted and a warning will be printed to stderr.

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darshan-2.1.1
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=============
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* new darshan-convert command line utility for converting existing log files,
  with optional anonymization and optional bzip2 compression
* bzip2 support in command line utilities (but not in the darshan library
  itself)
* updated log file format that allows for string key/value pairs to be stored
  in the header
* added ability to set MPI-IO hints when writing darshan log
  at configure time: --with-log-hints
  at run time: DARSHAN_LOGHINTS environment variable
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* bug fix contributed by Sandra Schröder: use case-insensitive search for MPI
  symbols in Fortran wrapper script
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* performance bug fix: remove unecessary call to MPI_File_set_size when
  writing log
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* added --with-logpath-by-env configure option to allow absolute 
  log path to be specified via environment variable

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darshan-2.1.0
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* additinoal environment variables to control log, jobid and
  alignment parameters
* additional configure tests to improve portability
* bug fixes for darshan-parser --perf calucations
* support for MPI1.x
* support for OpenMPI
* support for PGI, Intel compilers
* new libdarshan.so dynamic library for use with LD_PRELOAD

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darshan-2.0.2
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* added a random identifier to job logs (to avoid collisions from multiple
  application instances within a single scheduler job)
* improved installation and library path management for darshan-job-summary.pl
* improved error handling in darshan-job-summary.pl
* additional derived statistics categories for darshan-parser output:
    --all   : all sub-options are enabled
    --base  : darshan log field data [default]
    --file  : total file counts
    --perf  : derived perf data
    --total : aggregated darshan field data

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darshan-2.0.1
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* bug fix to variance/minimum calculations on shared files
* switch to automatic generation of all MPI compiler scripts using
  darshan-gen-* tools
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* new run time environment variable: DARSHAN_INTERNAL_TIMING.  If set at job
  execution time, it will cause Darshan to time its own internal data 
  aggregation routines and print the results to stdout at rank 0.

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darshan-2.0.0
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* new output file format that is portable across architectures
  NOTE: Darshan 1.x output files are incompatible with the tools in this 
  release unless they were generated on a ppc32 architecture (Blue Gene)
* 8 new counters that record the rank of the fastest and slowest process that
  opened each shared file, along with the number of seconds and number of
  bytes consumed by those processes.  It also reports the variance in both
  time and amount of data.
* new --with-jobid-env configure argument to support recording job identifiers
  from different schedulers
* job ID is now recorded within the Darshan log in addition to in the file
  name
* darshan-job-summary.pl:
  * opens output files directly without using intermediate darshan-parser output
  * table showing data usage per file system
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  * table showing I/O variance in shared files
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* Fixes for bugs reported by Noah Watkins: 
  * avoid name collision in hashing function
  * divide by zero error in darshan-job-summary.pl
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darshan-1.1.14
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* fixed erroneous incompatibility warning when opening old logs in darshan-parser

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darshan-1.1.13
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* updated compiler scripts to fix link order in some cases with -lhdf5

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darshan-1.1.12
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* improved mapping of file records to mount points
* new page in darshan-job-summary.pl output showing timelines of file access
* bug fix to "fast" mpif90 script
* checkpoint/restart ability in parallel fsstats script

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darshan-1.1.11
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* Bug fix for lseek, pread, and pwrite when used in 32 applications without large file support
* Improved experimental darshan-gen-cc.pl script
* Added new experimental darshan-gen-cxx.pl script
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darshan-1.1.10
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* Bug fix for files that are accessed with stat() but never opened
* Workaround zlib problems with 64 bit offsets on 32 bit architectures

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darshan-1.1.9
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* Added "fast" version of each BG/P compiler
* Added experimental scripts in test directory to run fsstats in parallel
* Kevin Harms: Added experimental utilities for loading darshan results into SQL
* Use exclusive flag when opening output file (to protect against file name collision)
* Rob Ross: updates to allow command line tools to build on Darwin
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* Bug fix for pnetcdf configure problem reported by Rob Latham; darshan now always pulls in MPI_Wtime() symbol at link time
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darshan-1.1.8
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* Added tracking of file system type and mount point for each file
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* Added tracking of file size at open time (CP_SIZE_AT_OPEN)
* Moved sync cost to be counted in cumulative write time rather than cumulative metadata time
* Added sync as a separate category in darshan-job-summar.pl counters
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* Bug fix to most frequent access size table in darshan-job-summary.pl
* Converted all utilities to use darshan-logutils api for reading output files
* Added backwards compatibility to darshan-logutils routines
* Kevin Harms: Added darshan-analyzer utility to summarize usage of MPI-IO, pNetCDF, HDF5, and shared files across a set of output files
* Fixed bug field listing for darshan-diff utility

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darshan-1.1.7
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* Minor fix for a compile warning

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darshan-1.1.6
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* Kevin Harms: bug fix for segfault in apps that use MPI_Init_thread()

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darshan-1.1.5
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* Limit PMPI usage in library to fewer functions
* Update PMPI detection in compiler scripts to ignore functions unused by Darshan

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darshan-1.1.4
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* Track files opened via Parallel NetCDF
* Track files opened via HDF5
* Record slowest individual POSIX read and write times along with access size for those operations
* Inspect symbols at compile time to determine whether to enable Darshan or not based on the presence of MPI and PMPI symbols
* Use GNU and IBM compilers from path rather than hard coded location
* Simplify warning message if unable to open log file
* Remove unused internal benchmark routines

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darshan-1.1.3
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* Updated compiler scripts for V1R4 driver on BlueGene/P

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darshan-1.1.2
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* Added *_r versions of each IBM compiler script on BlueGene/P

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darshan-1.1.1
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* Set default permissions to 0400 (user read only) for output files
* Automatically disable Darshan at link time if common PMPI libraries are detected in the command line
* Experimental tool (darshan-gen-cc.pl) to automatically generate Darshan-enabled mpicc scripts

darshan-1.1.0
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* Initial public release