Darshan

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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.
* Update patches and documentation for Cray xt-asyncpe environment 5.12 or
higher; contributed by Yushu Yao.
* Update documentation to no longer recommend --enable-stat-at-open option on
any systems
* Fix unresolved symbols error when linking non-MPI programs with Cray
compiler. Reported by Yushu Yao.
* 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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* Disable extra stat() of newly opened files by default. This improves
performance on shared files for some platforms. Reported by Yushu Yao.
- 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
* Fix missing -lz in post ld flags reported by Yushu Yao. Fixes a link-time
error for some corner-case applications.
* Fix bug in Cray compiler script patches that was setting compiler flags
incorrectly. Reported by Yushu Yao.
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.
* 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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* improved Cray XE6 support
- support for GNU, PGI, Cray, Pathscale, and Intel compilers
- patch adding Darshan capability to system compiler scripts
- software module, including testing and features contributed
by Yushu Yao and Katie Antypas of The National Energy Research
Scientific Computing Center (NERSC)
- improved documentation
* 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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* 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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* significant improvements to how counters are handled in multi-threaded
applications
* initial (rough) documentation for using Darshan in Cray
programming environments with static linking
* bug fixes:
- escape special characters in mount point paths in darshan-job-summary.pl
(reported by Mouhamed Gueye)
- 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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* 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
* documentation:
- improved documentation for both the darshan-runtime and darshan-util
portions of Darshan can be found in the respective doc/ subdirectory for
each