STXXL v1.4.1 Release Notes

Release Date: 2015-06-15 // about 9 years ago
  • ๐Ÿ”– Version 1.4.1 (29 October 2014)

    • ๐Ÿ‘Œ support kernel based asynchronous I/O on Linux (new file type "linuxaio"),
      which exploits Native Command Queuing (NCQ) if available.
      disable/enable with the define STXXL_FILE_LINUXAIO 0/1 via cmake
    • adding new disk_config entry device_id, which specifies the physical device
      id of the "disk" used during prefetching sequence calculations. This used to
      ๐Ÿง be identical with the queue id, however, for linuxaio there is only one
      0๏ธโƒฃ queue; thus the distinction had to be made. In a default config, no changes
      are necessary, as the device_id parameter is automatically enumerated.
    • โž• adding stxxl::binary_buffer which can be used for compact serialization and
      reading via a stxxl::binary_reader cursor interface.
    • stxxl::unordered_map is a hash map, backed by external memory. It probably
      only works well when lots of internal memory is used to buffer access to a
      relatively small working set. Then, however, fast direct in-memory item
      access can be used.
    • stxxl::external_shared_ptr is a proxy class to allow use of shared_ptr
      classes inside stxxl containers. Reference counts are kept in memory, while
      data may be swapped out to disk.
    • removing struct default_completion_handler, using a NULL pointer in default
      complete handler instead, since otherwise a default_completion_handler
      objects is cloned for each_io_request! Using a NULL pointer avoids
      superfluous new/delete work on the heap.
    • minor changes:
      • disable TPIE benchmarks by default, removing a warning.
      • compilation and tests work under MinGW 64-bit with special threads.
      • fixed compilation on 32-bit systems, everything is -Wconversion safe.
      • adding 32-bit and 64-bit cmdline_parser::add_bytes() variants.
      • removing all double underscores.
      • use atomic_counted_object in class file for request reference counting.
      • adding local/test2.cpp containing a stxxl::sorter example.