/usr/include/stxxl/bits/defines.h is in libstxxl-dev 1.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* include/stxxl/bits/defines.h
*
* Document all defines that may change the behavior of stxxl.
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2008-2010 Andreas Beckmann <beckmann@cs.uni-frankfurt.de>
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
**************************************************************************/
#ifndef STXXL_DEFINES_HEADER
#define STXXL_DEFINES_HEADER
//#define STXXL_HAVE_MMAP_FILE 0/1
//#define STXXL_HAVE_SIMDISK_FILE 0/1
//#define STXXL_HAVE_BOOSTFD_FILE 0/1
//#define STXXL_HAVE_WINCALL_FILE 0/1
//#define STXXL_HAVE_WBTL_FILE 0/1
#define STXXL_HAVE_AIO_FILE 0 // only available on the kernelaio branch
// default: 0/1 (platform and type dependent)
// used in: io/*_file.h, io/*_file.cpp, mng/mng.cpp
// affects: library
// effect: enables/disables some file implementations
//#define STXXL_CHECK_BLOCK_ALIGNING
// default: not defined
// used in: io/*_file.cpp
// effect: call request::check_alignment() from request::request(...)
//#define STXXL_CHECK_FOR_PENDING_REQUESTS_ON_SUBMISSION 0/1
// default: 1
// used in: io/*_queue*.cpp
// affects: library
// effect: check (and warn) for multiple concurrently pending I/O requests
// for the same block, usually causing coherency problems on
// out-of-order execution
//#define STXXL_DO_NOT_COUNT_WAIT_TIME
// default: not defined
// used in: io/iostats.{h,cpp}
// effect: makes calls to wait time counting functions no-ops
//#define STXXL_WAIT_LOG_ENABLED
// default: not defined
// used in: common/log.cpp, io/iostats.cpp
// effect: writes wait timing information to the file given via environment
// variable STXXLWAITLOGFILE, does nothing if this is not defined
//#define STXXL_PRINT_TIMESTAMP_ALWAYS
// default: not defined
// used in: common/verbose.cpp
// affects: library
// effect: prefix all MSG/ERRMSG/VERBOSE with elapsed time since program start
//#define STXXL_SORT_OPTIMAL_PREFETCHING 0/1
// default: 1
// used in: algo/*sort.h, stream/sort_stream.h
// effect if defined to 0: does not reorder prefetch requests to a disk
// optimal schedule (Hutchinson, Sanders, Vitter: Duality between
// prefetching and queued writing on parallel disks, 2005)
//#define STXXL_CHECK_ORDER_IN_SORTS 0/1
// default: 0
// used in: algo/*sort.h, stream/sort_stream.h, containers/priority_queue.h
// effect if set to 1: perform additional checking of sorted results
//#define STXXL_NO_WARN_RECURSIVE_SORT
// default: not defined
// used in: algo/sort_base.h
// affects: programs
// effect if defined: does not print error messages about possibly inefficient
// recursive merging
//#define STXXL_HACK_SINGLE_IO_THREAD
// default: not defined
// used in: io/disk_queues.h
// affects: programs
// effect if defined: uses only a single I/O thread instead of one per disk
// used e.g. by EcoSort which puts input file, output file and
// scratch on a single disk (RAID0)
#endif // !STXXL_DEFINES_HEADER
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