New release STXXL 1.3.1

  • Andreas Beckmann

    STXXL 1.3.1 was just released.

    The changes are:

    * Possibly breaking changes
      - No longer open syscall files with O_SYNC|O_DSYNC|O_RSYNC by default when
        doing direct I/O, to avoid a write performance decrease starting with Linux
        kernel version 2.6.32.
        A stxxl::file::SYNC flag has been added to allow forcing the O_*SYNC flags
        when opening files.
      - Lock files by default (if implemented for this file type), can by disabled
        via stxxl::file::NO_LOCK.
      - block_prefetcher now takes a completion_handler instead of a raw function
        pointer.  Furthermore, the completion_handler is already executed after the
        read operation completes, not only when the issuer waits for it to
        complete.  The I/O thread issues the call to the completion_handler, so for
        multiple disks, this may happen concurrently.
    * Internal changes, not user-visible
      - Change handling of (empty) filler elements in typed_block to fix
        mismatching struct size in nested blocks.
      - Removed debugmon which was very limited and disabled for a long time.
    * Bugfixes
      - Allow prefetch schedule computation of vectors that are bound to a file.
      - Fix race growing files during concurrent block allocation.
      - Allow reading a block that spans over end-of-file, fill remainder with
      - Crash at program termination when using global stxxl containers.
      - Enable syscall_file to read/write >=2GiB of data in a single I/O operation.
    * New public headers: stxxl/stats, stxxl/request
    * Parallel mode can be switched on for internal STXXL computation selectively
      (i.e. without enabling it for the non-stxxl part of an application), by
      setting USE_PARALLEL_MODE=yes in make.settings.local.
    * Platform Support
      - add ICPC 12.0, works with both MCSTL (needs libstdc++ from GCC 4.2) and
        parallel mode (needs libstdc++ from GCC 4.3 (not 4.4/4.5))
      - add CLANG++ 2.8
      - add MSVC 2010/Windows 7
      - allow the library name generated by MSVC to be changed by setting LIBNAME
        and redefining STXXL_LIBNAME (defaults to "stxxl")
    * Under-the-hood improvements
      - code cleanup
      - I/O-layer: renaming and reorganization of the request implementation
    * Documentation updates
    * Several new test programs
    * Several test programs improved


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