group.of.nepali.translators team mailing list archive

[David Britton <david.britton@xxxxxxxxxxxxx>]

** Changed in: curtin
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1482994

Title:
  creating swap with dd is slow

Status in curtin:
  Fix Released
Status in curtin package in Ubuntu:
  Fix Released
Status in curtin source package in Trusty:
  Fix Released
Status in curtin source package in Xenial:
  Fix Released
Status in curtin source package in Zesty:
  Fix Released
Status in curtin source package in Artful:
  Fix Released

Bug description:
  Currently swap file is created by dd command. It takes time linearly
  correlate with the size.

  > 34359738368 bytes (34 GB) copied, 154.964 s, 222 MB/s

  It would be nice if curtin used "fallocate" if available instead of
  dd. It should finish in a second.

  [curtin/swap.py]
       83     msg = "creating swap file '%s' of %sMB" % (swapfile, mbsize)
       84     fpath = os.path.sep.join([target, swapfile])
       85     try:
       86         util.ensure_dir(os.path.dirname(fpath))
       87         with util.LogTimer(LOG.debug, msg):
       88             util.subp(
       89                 ['sh', '-c',
       90                  ('rm -f "$1" && umask 0066 && '
       91                   'dd if=/dev/zero "of=$1" bs=1M "count=$2" && '
       92                   'mkswap "$1" || { r=$?; rm -f "$1"; exit $r; }'),
       93                  'setup_swap', fpath, mbsize])

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