def setup_swapfile(fname, size=None, maxsize=None):
"""
fname: full path string of filename to setup
size: the size to create. set to "auto" for recommended
maxsize: the maximum size
"""
swap_dir = os.path.dirname(fname)
if str(size).lower() == "auto":
try:
memsize = util.read_meminfo()["total"]
except IOError:
LOG.debug("Not creating swap: failed to read meminfo")
return
util.ensure_dir(swap_dir)
size = suggested_swapsize(fsys=swap_dir,
maxsize=maxsize,
memsize=memsize)
mibsize = str(int(size / (2**20)))
if not size:
LOG.debug("Not creating swap: suggested size was 0")
return
util.log_time(
LOG.debug,
msg="Setting up swap file",
func=create_swapfile,
args=[fname, mibsize],
)
return fname
def setup_swapfile(fname, size=None, maxsize=None):
"""
fname: full path string of filename to setup
size: the size to create. set to "auto" for recommended
maxsize: the maximum size
"""
tdir = os.path.dirname(fname)
if str(size).lower() == "auto":
try:
memsize = util.read_meminfo()['total']
except IOError:
LOG.debug("Not creating swap: failed to read meminfo")
return
util.ensure_dir(tdir)
size = suggested_swapsize(fsys=tdir, maxsize=maxsize, memsize=memsize)
if not size:
LOG.debug("Not creating swap: suggested size was 0")
return
mbsize = str(int(size / (2**20)))
msg = "creating swap file '%s' of %sMB" % (fname, mbsize)
try:
util.ensure_dir(tdir)
# Check if filesystem is safe for fallocate
fname_fs_type = util.get_mount_info(fname)[1]
if fname_fs_type in ['xfs']:
create_swapfile_command = 'dd if=/dev/zero "of=$1" bs=1M "count=$2"'
else:
create_swapfile_command = 'fallocate -l "${2}M" "$1"'
util.log_time(LOG.debug,
msg,
func=util.subp,
args=[[
'sh', '-c',
('rm -f "$1" && umask 0066 && '
'%s && '
'mkswap "$1" || { r=$?; rm -f "$1"; exit $r; }' %
create_swapfile_command), 'setup_swap', fname,
mbsize
]])
except Exception as e:
raise IOError("Failed %s: %s" % (msg, e))
return fname
def setup_swapfile(fname, size=None, maxsize=None):
"""
fname: full path string of filename to setup
size: the size to create. set to "auto" for recommended
maxsize: the maximum size
"""
tdir = os.path.dirname(fname)
if str(size).lower() == "auto":
try:
memsize = util.read_meminfo()['total']
except IOError as e:
LOG.debug("Not creating swap. failed to read meminfo")
return
util.ensure_dir(tdir)
size = suggested_swapsize(fsys=tdir, maxsize=maxsize,
memsize=memsize)
if not size:
LOG.debug("Not creating swap: suggested size was 0")
return
mbsize = str(int(size / (2 ** 20)))
msg = "creating swap file '%s' of %sMB" % (fname, mbsize)
try:
util.ensure_dir(tdir)
util.log_time(LOG.debug, msg, func=util.subp,
args=[['sh', '-c',
('rm -f "$1" && umask 0066 && '
'{ fallocate -l "${2}M" "$1" || '
' dd if=/dev/zero "of=$1" bs=1M "count=$2"; } && '
'mkswap "$1" || { r=$?; rm -f "$1"; exit $r; }'),
'setup_swap', fname, mbsize]])
except Exception as e:
raise IOError("Failed %s: %s" % (msg, e))
return fname
def suggested_swapsize(memsize=None, maxsize=None, fsys=None):
# make a suggestion on the size of swap for this system.
if memsize is None:
memsize = util.read_meminfo()['total']
GB = 2**30
sugg_max = 8 * GB
info = {'avail': 'na', 'max_in': maxsize, 'mem': memsize}
if fsys is None and maxsize is None:
# set max to 8GB default if no filesystem given
maxsize = sugg_max
elif fsys:
statvfs = os.statvfs(fsys)
avail = statvfs.f_frsize * statvfs.f_bfree
info['avail'] = avail
if maxsize is None:
# set to 25% of filesystem space
maxsize = min(int(avail / 4), sugg_max)
elif maxsize > ((avail * .9)):
# set to 90% of available disk space
maxsize = int(avail * .9)
elif maxsize is None:
maxsize = sugg_max
info['max'] = maxsize
formulas = [
# < 1G: swap = double memory
(1 * GB, lambda x: x * 2),
# < 2G: swap = 2G
(2 * GB, lambda x: 2 * GB),
# < 4G: swap = memory
(4 * GB, lambda x: x),
# < 16G: 4G
(16 * GB, lambda x: 4 * GB),
# < 64G: 1/2 M up to max
(64 * GB, lambda x: x / 2),
]
size = None
for top, func in formulas:
if memsize <= top:
size = min(func(memsize), maxsize)
# if less than 1/2 memory and not much, return 0
if size < (memsize / 2) and size < 4 * GB:
size = 0
break
break
if size is not None:
size = maxsize
info['size'] = size
MB = 2**20
pinfo = {}
for k, v in info.items():
if isinstance(v, int):
pinfo[k] = "%s MB" % (v / MB)
else:
pinfo[k] = v
LOG.debug(
"suggest %s swap for %s memory with '%s'"
" disk given max=%s [max=%s]'", pinfo['size'], pinfo['mem'],
pinfo['avail'], pinfo['max_in'], pinfo['max'])
return size
def suggested_swapsize(memsize=None, maxsize=None, fsys=None):
# make a suggestion on the size of swap for this system.
if memsize is None:
memsize = util.read_meminfo()['total']
GB = 2 ** 30
sugg_max = 8 * GB
info = {'avail': 'na', 'max_in': maxsize, 'mem': memsize}
if fsys is None and maxsize is None:
# set max to 8GB default if no filesystem given
maxsize = sugg_max
elif fsys:
statvfs = os.statvfs(fsys)
avail = statvfs.f_frsize * statvfs.f_bfree
info['avail'] = avail
if maxsize is None:
# set to 25% of filesystem space
maxsize = min(int(avail / 4), sugg_max)
elif maxsize > ((avail * .9)):
# set to 90% of available disk space
maxsize = int(avail * .9)
elif maxsize is None:
maxsize = sugg_max
info['max'] = maxsize
formulas = [
# < 1G: swap = double memory
(1 * GB, lambda x: x * 2),
# < 2G: swap = 2G
(2 * GB, lambda x: 2 * GB),
# < 4G: swap = memory
(4 * GB, lambda x: x),
# < 16G: 4G
(16 * GB, lambda x: 4 * GB),
# < 64G: 1/2 M up to max
(64 * GB, lambda x: x / 2),
]
size = None
for top, func in formulas:
if memsize <= top:
size = min(func(memsize), maxsize)
# if less than 1/2 memory and not much, return 0
if size < (memsize / 2) and size < 4 * GB:
size = 0
break
break
if size is not None:
size = maxsize
info['size'] = size
MB = 2 ** 20
pinfo = {}
for k, v in info.items():
if isinstance(v, int):
pinfo[k] = "%s MB" % (v / MB)
else:
pinfo[k] = v
LOG.debug("suggest %(size)s swap for %(mem)s memory with '%(avail)s'"
" disk given max=%(max_in)s [max=%(max)s]'" % pinfo)
return size
