Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-6979221

(fc) FileChannel.transferTo/From need to be "tuned"

XMLWordPrintable

    • Icon: Enhancement Enhancement
    • Resolution: Fixed
    • Icon: P4 P4
    • tbd
    • 7
    • core-libs
    • None
    • generic
    • generic

      This bug is submitted as a reminder to re-visit the transferTo/transferFrom implementation to make sure that the best strategy is used for all platforms.

      In particular:

      1. On Solaris then sendfile is used when the target is a FileChannelImpl and we should re-verify that this is indeed better than implementing it in user-space for various transfer sizes.

      2. On Windows then memory mapped files may not be the same win that it is on Solaris/Linux and we should check if it would be faster to use simple read/write.

      3. On Solaris/Linux then it may be faster to use simple read/write when the transfer size is small. Solaris cp(1) for example only uses memory mapping then the file is larger than 32k.

            bpb Brian Burkhalter
            alanb Alan Bateman
            Votes:
            0 Vote for this issue
            Watchers:
            1 Start watching this issue

              Created:
              Updated:
              Resolved:
              Imported:
              Indexed: