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@WardF
WardF authored Aug 11, 2023
2 parents c4ecdd6 + f72e3cb commit 939245c
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61 changes: 42 additions & 19 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -364,14 +364,17 @@ ENDIF()
# Option checks
################################

# HDF5 cache variables.
# Default Cache variables.
SET(DEFAULT_CHUNK_SIZE 16777216 CACHE STRING "Default Chunk Cache Size.")
SET(DEFAULT_CHUNKS_IN_CACHE 10 CACHE STRING "Default number of chunks in cache.")
SET(CHUNK_CACHE_SIZE 16777216 CACHE STRING "Default Chunk Cache Size.")
SET(CHUNK_CACHE_NELEMS 4133 CACHE STRING "Default maximum number of elements in cache.")
SET(CHUNK_CACHE_PREEMPTION 0.75 CACHE STRING "Default file chunk cache preemption policy for HDf5 files(a number between 0 and 1, inclusive.")
SET(CHUNK_CACHE_SIZE_NCZARR 4194304 CACHE STRING "Default NCZarr Chunk Cache Size.")
SET(MAX_DEFAULT_CACHE_SIZE 67108864 CACHE STRING "Default maximum cache size.")
SET(DEFAULT_CHUNK_CACHE_SIZE 16777216U CACHE STRING "Default Chunk Cache Size.")
SET(DEFAULT_CHUNKS_IN_CACHE 1000 CACHE STRING "Default number of chunks in cache.")
SET(DEFAULT_CHUNK_CACHE_PREEMPTION 0.75 CACHE STRING "Default file chunk cache preemption policy (a number between 0 and 1, inclusive.")

# HDF5 default cache size values
SET(CHUNK_CACHE_SIZE ${DEFAULT_CHUNK_CACHE_SIZE} CACHE STRING "Default HDF5 Chunk Cache Size.")
SET(CHUNK_CACHE_NELEMS ${DEFAULT_CHUNKS_IN_CACHE} CACHE STRING "Default maximum number of elements in cache.")
SET(CHUNK_CACHE_PREEMPTION ${DEFAULT_CHUNK_CACHE_PREEMPTION} CACHE STRING "Default file chunk cache preemption policy for HDf5 files(a number between 0 and 1, inclusive.")

SET(NETCDF_LIB_NAME "" CACHE STRING "Default name of the netcdf library.")
SET(TEMP_LARGE "." CACHE STRING "Where to put large temp files if large file tests are run.")
SET(NCPROPERTIES_EXTRA "" CACHE STRING "Specify extra pairs for _NCProperties.")
Expand Down Expand Up @@ -1110,31 +1113,51 @@ macro(set_std_filter filter)
# Upper case the filter name
string(TOUPPER "${filter}" upfilter)
string(TOLOWER "${filter}" downfilter)
if(ENABLE_FILTER_${upfilter})
# Define a test flag for filter
IF(${filter}_FOUND)
INCLUDE_DIRECTORIES(${${filter}_INCLUDE_DIRS})
SET(ENABLE_${upfilter} TRUE)
SET(HAVE_${upfilter} ON)
SET(STD_FILTERS "${STD_FILTERS} ${downfilter}")
MESSAGE(">>> Standard Filter: ${downfilter}")
IF(${filter}_FOUND)
INCLUDE_DIRECTORIES(${${filter}_INCLUDE_DIRS})
SET(ENABLE_${upfilter} TRUE)
SET(HAVE_${upfilter} ON)
SET(STD_FILTERS "${STD_FILTERS} ${downfilter}")
MESSAGE(">>> Standard Filter: ${downfilter}")
ELSE()
SET(ENABLE_${upfilter} FALSE)
SET(HAVE_${upfilter} OFF)
ENDIF()
ELSE()
SET(ENABLE_${upfilter} FALSE)
SET(HAVE_${upfilter} OFF)
ENDIF()
endmacro(set_std_filter)

# Locate some compressors
FIND_PACKAGE(Szip)
FIND_PACKAGE(Bz2)
FIND_PACKAGE(Blosc)
FIND_PACKAGE(Zstd)
OPTION(ENABLE_FILTER_SZIP "Enable use of Szip compression library if it is available. Required if ENABLE_NCZARR is true." ON)
OPTION(ENABLE_FILTER_BZ2 "Enable use of Bz2 compression library if it is available." ON)
OPTION(ENABLE_FILTER_BLOSC "Enable use of blosc compression library if it is available." ON)
OPTION(ENABLE_FILTER_ZSTD "Enable use of Zstd compression library if it is available." ON)
IF (ENABLE_FILTER_SZIP)
FIND_PACKAGE(Szip)
ELSEIF(ENABLE_NCZARR)
FIND_PACKAGE(Szip)
ENDIF()
IF (ENABLE_FILTER_BZ2)
FIND_PACKAGE(Bz2)
ENDIF()
IF (ENABLE_FILTER_BLOSC)
FIND_PACKAGE(Blosc)
ENDIF()
IF (ENABLE_FILTER_ZSTD)
FIND_PACKAGE(Zstd)
ENDIF()

# Accumulate standard filters
set(STD_FILTERS "deflate") # Always have deflate*/
set_std_filter(Szip)
SET(HAVE_SZ ${Szip_FOUND})
SET(HAVE_SZ ${Szip_FOUND})
set_std_filter(Blosc)
IF(Zstd_FOUND)
set_std_filter(Zstd)
ENDIF()
IF(Bz2_FOUND)
set_std_filter(Bz2)
ELSE()
Expand Down
7 changes: 5 additions & 2 deletions RELEASE_NOTES.md
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,9 @@ This file contains a high-level description of this package's evolution. Release

## 4.9.3 - TBD

* Fix default parameters for caching of NCZarr. See [Github #2734](https://github.com/Unidata/netcdf-c/pull/2734).
* Introducing configure-time options to disable various filters, even if the required libraries are available on the system, in support of [GitHub #2712](https://github.com/Unidata/netcdf-c/pull/2712).
* Fix memory leak WRT unreclaimed HDF5 plist. See [Github #2752](https://github.com/Unidata/netcdf-c/pull/2752).
* Support HDF5 transient types when reading an HDF5 file. See [Github #2724](https://github.com/Unidata/netcdf-c/pull/2724).
* Suppress filters on variables with non-fixed-size types. See [Github #2716](https://github.com/Unidata/netcdf-c/pull/2716).
* Provide a single option to disable all network access and testing. See [Github #2708](https://github.com/Unidata/netcdf-c/pull/2708).
Expand Down Expand Up @@ -473,7 +476,7 @@ See [GitHub #1251](https://github.com/Unidata/netcdf-c/issues/1251).

### 4.4.1-RC1 - April 15, 2016

* [Bug Fix][Enhancement] Fixed an issue with netCDF4 files generated using version `1.10.0` of the HDF5 library. The 1.10 release potentially changed the underlying file format, introducing a backwards compatibility issue with the files generated. HDF5 provided an API for retaining the 1.8.x file format, which is now on by default. See [GitHub Issue #250](https://github.com/Unidata/netcdf-c/issues/250) for more information.
* [Bug Fix][Enhancement][File Change] Fixed an issue with netCDF4 files generated using version `1.10.0` of the HDF5 library. The 1.10 release potentially changed the underlying file format, introducing a backwards compatibility issue with the files generated. HDF5 provided an API for retaining the 1.8.x file format, which is now on by default. See [GitHub Issue #250](https://github.com/Unidata/netcdf-c/issues/250) for more information.
* [Bug Fix] Corrected an issue with autotools-based builds performed out-of-source-tree. See [GitHub Issue #242](https://github.com/Unidata/netcdf-c/issues/242) for more information.
* [Enhancement] Modified `nc_inq_type()` so that it would work more broadly without requiring a valid ncid. See [GitHub Issue #240](https://github.com/Unidata/netcdf-c/issues/240) for more information.
* [Enhancement] Accepted a patch code which added a hashmap lookup for rapid var and dim retrieval in nc3 files, contributed by Greg Sjaardema. See [GitHub Pull Request #238](https://github.com/Unidata/netcdf-c/pull/238) for more information.
Expand Down Expand Up @@ -527,7 +530,7 @@ See [GitHub #1251](https://github.com/Unidata/netcdf-c/issues/1251).
2. Given #1, then the NC_PNETCDF mode flag becomes a subset of NC_MPIIO, so made NC_PNETCDF an alias for NC_MPII.
3. NC_FORMAT_64BIT is now deprecated. Use NC_FORMAT_64BIT_OFFSET.

Further information regarding the CDF-5 file format specifrication may be found here: http://cucis.ece.northwestern.edu/projects/PnetCDF/CDF-5.html
Further information regarding the CDF-5 file format specification may be found here: http://cucis.ece.northwestern.edu/projects/PnetCDF/CDF-5.html

* Modified configure.ac to provide finer control over parallel
support. Specifically, add flags for:
Expand Down
17 changes: 10 additions & 7 deletions config.h.cmake.in
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Original file line number Diff line number Diff line change
Expand Up @@ -83,9 +83,6 @@ are set when opening a binary file on Windows. */
/* default file chunk cache size in bytes. */
#cmakedefine CHUNK_CACHE_SIZE ${CHUNK_CACHE_SIZE}

/* default nczarr chunk cache size in bytes. */
#cmakedefine CHUNK_CACHE_SIZE_NCZARR ${CHUNK_CACHE_SIZE_NCZARR}

/* Define to one of `_getb67', `GETB67', `getb67' for Cray-2 and Cray-YMP
systems. This function is required for `alloca.c' support on those systems.
*/
Expand All @@ -94,7 +91,16 @@ are set when opening a binary file on Windows. */
/* Define to 1 if using `alloca.c'. */
#cmakedefine C_ALLOCA 1

/* num chunks in default per-var chunk cache. */
/* default num chunks per cache. */
#cmakedefine DEFAULT_CHUNKS_CACHE_SIZE ${DEFAULT_CHUNKS_CACHE_SIZE}

/* default num chunks per cache. */
#cmakedefine DEFAULT_CHUNK_CACHE_PREEMPTION ${DEFAULT_CHUNK_CACHE_PREEMPTION}

/* default total chunks cache size. */
#cmakedefine DEFAULT_CHUNK_CACHE_SIZE ${DEFAULT_CHUNK_CACHE_SIZE}

/* default num chunks per cache. */
#cmakedefine DEFAULT_CHUNKS_IN_CACHE ${DEFAULT_CHUNKS_IN_CACHE}

/* default chunk size in bytes */
Expand Down Expand Up @@ -459,9 +465,6 @@ with zip */
/* If true, define nc_set_log_level. */
#cmakedefine ENABLE_SET_LOG_LEVEL 1

/* max size of the default per-var chunk cache. */
#cmakedefine MAX_DEFAULT_CACHE_SIZE ${MAX_DEFAULT_CACHE_SIZE}

/* min blocksize for posixio. */
#cmakedefine NCIO_MINBLOCKSIZE ${NCIO_MINBLOCKSIZE}

Expand Down
172 changes: 114 additions & 58 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -390,48 +390,58 @@ AC_ARG_WITH([default-chunk-size],
AC_MSG_RESULT([$DEFAULT_CHUNK_SIZE])
AC_DEFINE_UNQUOTED([DEFAULT_CHUNK_SIZE], [$DEFAULT_CHUNK_SIZE], [default chunk size in bytes])

# Did the user specify a max per-var cache size?
AC_MSG_CHECKING([whether a maximum per-variable cache size for HDF5 was specified])
AC_ARG_WITH([max-default-cache-size],
[AS_HELP_STRING([--with-max-default-cache-size=<integer>],
[Specify maximum size (in bytes) for the default per-var chunk cache.])],
[MAX_DEFAULT_CACHE_SIZE=$with_max_default_cache_size], [MAX_DEFAULT_CACHE_SIZE=67108864])
AC_MSG_RESULT([$MAX_DEFAULT_CACHE_SIZE])
AC_DEFINE_UNQUOTED([MAX_DEFAULT_CACHE_SIZE], [$MAX_DEFAULT_CACHE_SIZE], [max size of the default per-var chunk cache.])

# Did the user specify a number of chunks in default per-var cache size?
AC_MSG_CHECKING([whether a number of chunks for the default per-variable cache was specified])
# Did the user specify a default cache size?
AC_MSG_CHECKING([whether a default cache size was specified])
AC_ARG_WITH([default-chunk-cache-size],
[AS_HELP_STRING([--with-default-chunk-cache-size=<integer>],
[Specify default size (in bytes) for chunk cache.])],
[DEFAULT_CHUNK_CACHE_SIZE=$with_default_chunk_cache_size], [DEFAULT_CHUNK_CACHE_SIZE=16777216U])
AC_MSG_RESULT([$DEFAULT_CHUNK_CACHE_SIZE])
AC_DEFINE_UNQUOTED([DEFAULT_CHUNK_CACHE_SIZE], [$DEFAULT_CHUNK_CACHE_SIZE], [default size of the chunk cache.])

# Did the user specify a max number of chunks in default per-var cache size?
AC_MSG_CHECKING([whether a default number of entries for the chunk cache was specified])
AC_ARG_WITH([default-chunks-in-cache],
[AS_HELP_STRING([--with-default-chunks-in-cache=<integer>],
[Specify the number of chunks to store in default per-variable cache.])],
[DEFAULT_CHUNKS_IN_CACHE=$with_default_chunks_in_cache], [DEFAULT_CHUNKS_IN_CACHE=10])
[Specify the max number of chunks to store in cache.])],
[DEFAULT_CHUNKS_IN_CACHE=$with_default_chunks_in_cache], [DEFAULT_CHUNKS_IN_CACHE=1000])
AC_MSG_RESULT([$DEFAULT_CHUNKS_IN_CACHE])
AC_DEFINE_UNQUOTED([DEFAULT_CHUNKS_IN_CACHE], [$DEFAULT_CHUNKS_IN_CACHE], [num chunks in default per-var chunk cache.])
AC_DEFINE_UNQUOTED([DEFAULT_CHUNKS_IN_CACHE], [$DEFAULT_CHUNKS_IN_CACHE], [default max num chunks in chunk cache.])

# Did the user specify a default cache preemption
AC_MSG_CHECKING([whether a default cache preemption was specified])
AC_ARG_WITH([default-chunk-cache-preemption],
[AS_HELP_STRING([--with-chunk-cache-preemption=<float between 0 and 1 inclusive>],
[Specify default file chunk cache preemption policy (a number between 0 and 1, inclusive).])],
[DEFAULT_CHUNK_CACHE_PREEMPTION=$with_chunk_cache_preemption], [DEFAULT_CHUNK_CACHE_PREEMPTION=0.75])
AC_MSG_RESULT([$DEFAULT_CHUNK_CACHE_PREEMPTION])
AC_DEFINE_UNQUOTED([DEFAULT_CHUNK_CACHE_PREEMPTION], [$DEFAULT_CHUNK_CACHE_PREEMPTION], [default file chunk cache preemption policy.])

# These three options are redundant over the --with-default... options above.
# Did the user specify a default cache size for HDF5?
AC_MSG_CHECKING([whether a default file cache size for HDF5 was specified])
AC_ARG_WITH([chunk-cache-size],
[AS_HELP_STRING([--with-chunk-cache-size=<integer>],
[Specify default file cache chunk size for HDF5 files in bytes.])],
[CHUNK_CACHE_SIZE=$with_chunk_cache_size], [CHUNK_CACHE_SIZE=16777216])
[CHUNK_CACHE_SIZE=$with_chunk_cache_size], [CHUNK_CACHE_SIZE=DEFAULT_CHUNK_CACHE_SIZE])
AC_MSG_RESULT([$CHUNK_CACHE_SIZE])
AC_DEFINE_UNQUOTED([CHUNK_CACHE_SIZE], [$CHUNK_CACHE_SIZE], [default file chunk cache size in bytes.])

# Did the user specify a default cache nelems?
# Did the user specify a default max cache entries for HDF5
AC_MSG_CHECKING([whether a default file cache maximum number of elements for HDF5 was specified])
AC_ARG_WITH([chunk-cache-nelems],
[AS_HELP_STRING([--with-chunk-cache-nelems=<integer>],
[Specify default maximum number of elements in the file chunk cache chunk for HDF5 files (should be prime number).])],
[CHUNK_CACHE_NELEMS=$with_chunk_cache_nelems], [CHUNK_CACHE_NELEMS=4133])
[CHUNK_CACHE_NELEMS=$with_chunk_cache_nelems], [CHUNK_CACHE_NELEMS=DEFAULT_CHUNKS_IN_CACHE])
AC_MSG_RESULT([$CHUNK_CACHE_NELEMS])
AC_DEFINE_UNQUOTED([CHUNK_CACHE_NELEMS], [$CHUNK_CACHE_NELEMS], [default file chunk cache nelems.])

# Did the user specify a default cache preemption?
# Did the user specify a default cache preemption for HDF5?
AC_MSG_CHECKING([whether a default cache preemption for HDF5 was specified])
AC_ARG_WITH([chunk-cache-preemption],
[AS_HELP_STRING([--with-chunk-cache-preemption=<float between 0 and 1 inclusive>],
[Specify default file chunk cache preemption policy for HDF5 files (a number between 0 and 1, inclusive).])],
[CHUNK_CACHE_PREEMPTION=$with_chunk_cache_preemption], [CHUNK_CACHE_PREEMPTION=0.75])
[CHUNK_CACHE_PREEMPTION=$with_chunk_cache_preemption], [CHUNK_CACHE_PREEMPTION=DEFAULT_CHUNK_CACHE_PREEMPTION])
AC_MSG_RESULT([$CHUNK_CACHE_PREEMPTION])
AC_DEFINE_UNQUOTED([CHUNK_CACHE_PREEMPTION], [$CHUNK_CACHE_PREEMPTION], [default file chunk cache preemption policy.])

Expand Down Expand Up @@ -711,43 +721,95 @@ AM_CONDITIONAL(ENABLE_NCZARR, [test x$enable_nczarr = xyes])
# Look for Standardized libraries
##########

# See if we have libblosc
AC_CHECK_LIB([blosc],[blosc_init],[have_blosc=yes],[have_blosc=no])
if test "x$have_blosc" = "xyes" ; then
AC_SEARCH_LIBS([blosc_init],[blosc blosc.dll cygblosc.dll], [], [])
AC_DEFINE([HAVE_BLOSC], [1], [if true, blosc library is available])
fi

# See if we have libzstd
AC_CHECK_LIB([zstd],[ZSTD_compress],[have_zstd=yes],[have_zstd=no])
if test "x$have_zstd" = "xyes" ; then
AC_SEARCH_LIBS([ZSTD_compress],[zstd zstd.dll cygzstd.dll], [], [])
AC_DEFINE([HAVE_ZSTD], [1], [if true, zstd library is available])
##
# blosc checks
##

# See if we want to enable blosc, and if so, search for the library.
AC_MSG_CHECKING([whether to search for and enable blosc filter support])
AC_ARG_ENABLE([filter-blosc],
[AS_HELP_STRING([--disable-filter-blosc],
[disable blosc filter support.])])
test "x$enable_filter_blosc" = xno || enable_filter_blosc=yes
AC_MSG_RESULT($enable_filter_blosc)

if test "x$enable_filter_blosc" = "xyes" ; then
# See if we have libblosc
AC_CHECK_LIB([blosc],[blosc_init],[have_blosc=yes],[have_blosc=no])
if test "x$have_blosc" = "xyes" ; then
AC_SEARCH_LIBS([blosc_init],[blosc blosc.dll cygblosc.dll], [], [])
AC_DEFINE([HAVE_BLOSC], [1], [if true, blosc library is available])
fi
else
have_blosc=no
fi
AC_MSG_CHECKING([whether libzstd library is available])
AC_MSG_RESULT([${have_zstd}])
##
# End blosc checks
##

##
# Ensure that the zstd.h dev files are also available.
# libzstd checks
##
if test "x$have_zstd" = "xyes" ; then
AC_CHECK_HEADERS([zstd.h], [], [nc_zstd_h_missing=yes])
if test "x$nc_zstd_h_missing" = xyes; then
AC_MSG_WARN([zstd library detected, but zstd.h development file not found. Ensure that the zstd development files are installed in order to build zstd support.])
AC_DEFINE([HAVE_ZSTD], [0], [if true, zstd library is available])
have_zstd=no

# See if we want to enable libzstd, and if so, search for the library.
AC_MSG_CHECKING([whether to search for and enable libzstd filter support])
AC_ARG_ENABLE([filter-zstd],
[AS_HELP_STRING([--disable-filter-zstd],
[disable zstd filter support.])])
test "x$enable_filter_zstd" = xno || enable_filter_zstd=yes
AC_MSG_RESULT($enable_filter_zstd)

if test "x$enable_filter_zstd" = "xyes" ; then
# See if we have libzstd
AC_CHECK_LIB([zstd],[ZSTD_compress],[have_zstd=yes],[have_zstd=no])
if test "x$have_zstd" = "xyes" ; then
AC_SEARCH_LIBS([ZSTD_compress],[zstd zstd.dll cygzstd.dll], [], [])
AC_DEFINE([HAVE_ZSTD], [1], [if true, zstd library is available])

fi
AC_MSG_CHECKING([whether libzstd library is available])
AC_MSG_RESULT([${have_zstd}])

##
# Ensure that the zstd.h dev files are also available.
##
if test "x$have_zstd" = "xyes" ; then
AC_CHECK_HEADERS([zstd.h], [], [nc_zstd_h_missing=yes])
if test "x$nc_zstd_h_missing" = xyes; then
AC_MSG_WARN([zstd library detected, but zstd.h development file not found. Ensure that the zstd development files are installed in order to build zstd support.])
AC_DEFINE([HAVE_ZSTD], [0], [if true, zstd library is available])
have_zstd=no
fi
fi
fi

# See if we have libbz2
AC_CHECK_LIB([bz2],[BZ2_bzCompress],[have_bz2=yes],[have_bz2=no])
if test "x$have_bz2" = "xyes" ; then
AC_SEARCH_LIBS([BZ2_bzCompress],[bz2 bz2.dll cygbz2.dll], [], [])
AC_DEFINE([HAVE_BZ2], [1], [if true, bz2 library is installed])
else
have_zstd=no
fi
AC_MSG_CHECKING([whether libbz2 library is available])
AC_MSG_RESULT([${have_bz2}])
##
# End zstd checks
##

##
# Begin bz2 checks
##

# See if we want to enable BZ2, and if so, search for the library.
AC_MSG_CHECKING([whether to search for and enable external bz2 filter support])
AC_ARG_ENABLE([filter-bz2],
[AS_HELP_STRING([--disable-filter-bz2],
[disable external bz2 filter support. bz2 support defaults to internal implementation if this is disabled or if the external library is not found.])])
test "x$enable_filter_bz2" = xno || enable_filter_bz2=yes
AC_MSG_RESULT($enable_filter_bz2)

if test "x$enable_filter_bz2" = "xyes" ; then

AC_CHECK_LIB([bz2],[BZ2_bzCompress],[have_bz2=yes],[have_bz2=no])
if test "x$have_bz2" = "xyes" ; then
AC_SEARCH_LIBS([BZ2_bzCompress],[bz2 bz2.dll cygbz2.dll], [], [])
AC_DEFINE([HAVE_BZ2], [1], [if true, bz2 library is installed])
fi
AC_MSG_CHECKING([whether libbz2 library is available])
AC_MSG_RESULT([${have_bz2}])

if test "x$have_bz2" = x ; then
# How about bzip2
Expand All @@ -766,7 +828,11 @@ if test "x$have_bz2" = "xno" ; then
else
have_local_bz2=no
fi

AM_CONDITIONAL(HAVE_LOCAL_BZ2, [test "x$have_local_bz2" = xyes])
##
# End bz2 checks
##

# Note that szip management is tricky.
# This is because we have three things to consider:
Expand Down Expand Up @@ -905,16 +971,6 @@ if test "x$with_s3_testing" = xyes ; then
AC_MSG_WARN([*** DO NOT SPECIFY WITH_S3_TESTING=YES UNLESS YOU HAVE ACCESS TO THE UNIDATA S3 BUCKET! ***])
fi

# Set default
# Did the user specify a default cache size for NCZarr?
AC_MSG_CHECKING([whether a default file cache size for NCZarr was specified])
AC_ARG_WITH([chunk-cache-size-nczarr],
[AS_HELP_STRING([--with-chunk-cache-size-nczarr=<integer>],
[Specify default maximum space used by the chunk cache NCZarr.])],
[CHUNK_CACHE_SIZE_NCZARR=$with_chunk_cache_size_nczarr], [CHUNK_CACHE_SIZE_NCZARR=4194304])
AC_MSG_RESULT([$CHUNK_CACHE_SIZE_NCZARR])
AC_DEFINE_UNQUOTED([CHUNK_CACHE_SIZE_NCZARR], [$CHUNK_CACHE_SIZE_NCZARR], [default nczarr chunk cache size.])

# Check whether we want to enable strict null byte header padding.
# See https://github.com/Unidata/netcdf-c/issues/657 for more information.
AC_MSG_CHECKING([whether to enable strict null-byte header padding when reading (default off)])
Expand Down
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