def main(args=None):
if args is None:
args = sys.argv[1:]
options = parse_args(args)
setup_logging(options)
plain_bucket = get_bucket(options, plain=True)
if 's3ql_metadata' in plain_bucket:
if not options.force:
raise QuietError("Found existing file system! Use --force to overwrite")
log.info('Purging existing file system data..')
plain_bucket.clear()
if not plain_bucket.is_get_consistent():
log.info('Please note that the new file system may appear inconsistent\n'
'for a while until the removals have propagated through the backend.')
if not options.plain:
if sys.stdin.isatty():
wrap_pw = getpass("Enter encryption password: "******"Confirm encryption password: "******"Passwords don't match.")
else:
wrap_pw = sys.stdin.readline().rstrip()
# Generate data encryption passphrase
log.info('Generating random encryption key...')
fh = open('/dev/urandom', "rb", 0) # No buffering
data_pw = fh.read(32)
fh.close()
bucket = BetterBucket(wrap_pw, 'bzip2', plain_bucket)
bucket['s3ql_passphrase'] = data_pw
else:
data_pw = None
bucket = BetterBucket(data_pw, 'bzip2', plain_bucket)
# Setup database
cachepath = get_bucket_cachedir(options.storage_url, options.cachedir)
# There can't be a corresponding bucket, so we can safely delete
# these files.
if os.path.exists(cachepath + '.db'):
os.unlink(cachepath + '.db')
if os.path.exists(cachepath + '-cache'):
shutil.rmtree(cachepath + '-cache')
log.info('Creating metadata tables...')
db = Connection(cachepath + '.db')
create_tables(db)
init_tables(db)
param = dict()
param['revision'] = CURRENT_FS_REV
param['seq_no'] = 1
param['label'] = options.label
param['blocksize'] = options.blocksize * 1024
param['needs_fsck'] = False
param['last_fsck'] = time.time() - time.timezone
param['last-modified'] = time.time() - time.timezone
# This indicates that the convert_legacy_metadata() stuff
# in BetterBucket is not required for this file system.
param['bucket_revision'] = 1
bucket.store('s3ql_seq_no_%d' % param['seq_no'], 'Empty')
log.info('Uploading metadata...')
with bucket.open_write('s3ql_metadata', param) as fh:
dump_metadata(fh, db)
pickle.dump(param, open(cachepath + '.params', 'wb'), 2)
def main(args=None):
if args is None:
args = sys.argv[1:]
args = ['local:///home/nikratio/tmp/bucket', '/home/nikratio/tmp/testfile0']
options = parse_args(args)
setup_logging(options)
size = 100*1024*1024 # KB
log.info('Measuring throughput to cache...')
bucket_dir = tempfile.mkdtemp()
mnt_dir = tempfile.mkdtemp()
atexit.register(shutil.rmtree, bucket_dir)
atexit.register(shutil.rmtree, mnt_dir)
subprocess.check_call(['mkfs.s3ql', '--plain', 'local://%s' % bucket_dir,
'--quiet', '--cachedir', options.cachedir])
subprocess.check_call(['mount.s3ql', '--threads', '1', '--quiet',
'--cachesize', '%d' % (2 * size/1024), '--log',
'%s/mount.log' % bucket_dir, '--cachedir', options.cachedir,
'local://%s' % bucket_dir, mnt_dir])
with open('/dev/urandom', 'rb', 0) as src:
with open('%s/bigfile' % mnt_dir, 'wb', 0) as dst:
stamp = time.time()
copied = 0
while copied < size:
buf = src.read(256*1024)
dst.write(buf)
copied += len(buf)
fuse_speed = copied / (time.time() - stamp)
os.unlink('%s/bigfile' % mnt_dir)
subprocess.check_call(['umount.s3ql', mnt_dir])
log.info('Cache throughput: %.2f KB/sec', fuse_speed / 1024)
# Upload random data to prevent effects of compression
# on the network layer
log.info('Measuring raw backend throughput..')
bucket = get_bucket(options, plain=True)
with bucket.open_write('s3ql_testdata') as dst:
with open('/dev/urandom', 'rb', 0) as src:
stamp = time.time()
copied = 0
while copied < size:
buf = src.read(256*1024)
dst.write(buf)
copied += len(buf)
upload_speed = copied / (time.time() - stamp)
log.info('Backend throughput: %.2f KB/sec', upload_speed / 1024)
bucket.delete('s3ql_testdata')
src = options.file
size = os.fstat(options.file.fileno()).st_size
log.info('Test file size: %.2f MB', (size / 1024**2))
times = dict()
out_sizes = dict()
for alg in ('lzma', 'bzip2', 'zlib'):
log.info('compressing with %s...', alg)
bucket = BetterBucket('pass', alg, Bucket(bucket_dir, None, None))
with bucket.open_write('s3ql_testdata') as dst:
src.seek(0)
stamp = time.time()
while True:
buf = src.read(256*1024)
if not buf:
break
dst.write(buf)
times[alg] = time.time() - stamp
out_sizes[alg] = dst.compr_size
log.info('%s compression speed: %.2f KB/sec (in)', alg, size/times[alg]/1024)
log.info('%s compression speed: %.2f KB/sec (out)', alg,
out_sizes[alg] / times[alg] / 1024)
print('')
req = dict()
for alg in ('lzma', 'bzip2', 'zlib'):
backend_req = math.ceil(upload_speed * times[alg] / out_sizes[alg])
fuse_req = math.ceil(fuse_speed * times[alg] / size)
req[alg] = min(backend_req, fuse_req)
print('When using %s compression, incoming writes can keep up to %d threads\n'
'busy. The backend can handle data from up to %d threads. Therefore,\n'
'the maximum achievable throughput is %.2f KB/sec with %d threads.\n'
% (alg, fuse_req, backend_req, min(upload_speed, fuse_speed)/1024, req[alg]))
print('All numbers assume that the test file is representative and that',
'there are enough processor cores to run all threads in parallel.',
'To compensate for network latency, you should start about twice as',
'many upload threads as you need for optimal performance.\n', sep='\n')
cores = os.sysconf('SC_NPROCESSORS_ONLN')
best_size = None
max_threads = cores
while best_size is None:
for alg in out_sizes:
if req[alg] > max_threads:
continue
if best_size is None or out_sizes[alg] < best_size:
best_size = out_sizes[alg]
best_alg = alg
threads = req[alg]
max_threads = min(req.itervalues())
print('This system appears to have %d cores, so best performance with maximum\n'
'compression ratio would be achieved by using %s compression with %d\n'
'upload threads.' % (cores, best_alg,
2 * threads if cores >= threads else 2 * cores))
