openstack/nova
Code Issues Proposed changes

XenAPI: adjust bittorrent settings

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This commit addresses some optimizations when using libtorrent to
download.  The settings are documented here:
http://www.rasterbar.com/products/libtorrent/reference-Settings.html

I'm proposing to add these with dom0 environment overrides in case
any other adjustments are needed.  The changes effectively double the
download rate from the default settings.  It also allows unbalanced
download/upload which is preferred in openstack environments.

No unit tests were added as plugins are not currently unit tested.

Closes-bug: #1303993

Change-Id: I503a6a521c196e4ad58e0a16aba2988f66a9cdca
This commit is contained in:
Christopher Lefelhocz 2014-04-02 06:32:11 -05:00
parent 9b1160ab5a
commit 5255364933
1 changed files with 30 additions and 6 deletions
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36
plugins/xenserver/xenapi/etc/xapi.d/plugins/bittorrent
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@ -35,10 +35,15 @@ import pluginlib_nova
pluginlib_nova.configure_logging('bittorrent')
logging = pluginlib_nova.logging
# Taken from units since we don't pull down full library
Mi = 1024 ** 2
DEFAULT_TORRENT_CACHE = '/images/torrents'
DEFAULT_SEED_CACHE = '/images/seeds'
SEEDER_PROCESS = '_bittorrent_seeder'
DEFAULT_MMA = int(libtorrent.bandwidth_mixed_algo_t.prefer_tcp)
DEFAULT_MORQ = 400
DEFAULT_MQDB = 8 * Mi
DEFAULT_MQDBLW = 0
def _make_torrent_cache():
@ -100,6 +105,22 @@ def _download(torrent_path, save_as_path, torrent_listen_port_start,
torrent_listen_port_end, torrent_download_stall_cutoff):
session = libtorrent.session()
session.listen_on(torrent_listen_port_start, torrent_listen_port_end)
mixed_mode_algorithm = os.environ.get(
'DEFAULT_MIXED_MODE_ALGORITHM', DEFAULT_MMA)
max_out_request_queue = os.environ.get(
'DEFAULT_MAX_OUT_REQUEST_QUEUE', DEFAULT_MORQ)
max_queued_disk_bytes = os.environ.get(
'DEFAULT_MAX_QUEUED_DISK_BYTES', DEFAULT_MQDB)
max_queued_disk_bytes_low_watermark = os.environ.get(
'DEFAULT_MAX_QUEUED_DISK_BYTES_LOW_WATERMARK', DEFAULT_MQDBLW)
session_opts = {'mixed_mode_algorithm': mixed_mode_algorithm,
'max_queued_disk_bytes': max_queued_disk_bytes,
'max_out_request_queue': max_out_request_queue,
'max_queued_disk_bytes_low_watermark':
max_queued_disk_bytes_low_watermark}
session.set_settings(session_opts)
info = libtorrent.torrent_info(
libtorrent.bdecode(open(torrent_path, 'rb').read()))
@ -111,6 +132,7 @@ def _download(torrent_path, save_as_path, torrent_listen_port_start,
last_progress = 0
last_progress_updated = time.time()
log_time = 0
while not torrent.is_seed():
s = torrent.status()
@ -128,11 +150,13 @@ def _download(torrent_path, save_as_path, torrent_listen_port_start,
stall_duration, torrent_download_stall_cutoff))
raise Exception("Bittorrent download stall detected, bailing!")
logging.debug(
'%.2f%% complete (down: %.1f kb/s up: %.1f kB/s peers: %d)'
' %s %s' % (progress, s.download_rate / 1000,
s.upload_rate / 1000, s.num_peers, s.state,
torrent_path))
log_time += 1
if log_time % 10 == 0:
logging.debug(
'%.2f%% complete (down: %.1f kb/s up: %.1f kB/s peers: %d)'
' %s %s' % (progress, s.download_rate / 1000,
s.upload_rate / 1000, s.num_peers, s.state,
torrent_path))
time.sleep(1)
finally:
session.remove_torrent(torrent)