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import os
import sys
import time
from commontest import re_init_subdir, abs_test_dir, os_system
from rdiff_backup import rpath, Globals
"""benchmark.py
When possible, use 'rdiff-backup' from the shell, which allows using
different versions of rdiff-backup by altering the PYTHONPATH. We
just use clock time, so this isn't exact at all.
"""
new_pythonpath = None
# How many files to generate in the "many" benchmark
MANY_COUNT = 2000
# Which depth and factor to use in the "nested" benchmark
# Caution: count of files is factor**depth, it increases quickly!
NESTED_DEPTH = 4
NESTED_FACTOR = 7
def run_cmd(cmd):
"""Run the given cmd, return the amount of time it took"""
time.sleep(1) # just to be sure to not have the infamous message
# Fatal Error: Time of Last backup is not in the past. This is probably caused
# by running two backups in less than a second. Wait a second and try again.
if new_pythonpath:
full_cmd = b"PYTHONPATH=%b %b" % (new_pythonpath, cmd)
else:
full_cmd = cmd
print("Running command '%s'" % (full_cmd, ))
t = time.time()
rc = os_system(full_cmd)
if rc & Globals.RET_CODE_ERR:
raise RuntimeError("Return code of '{cmd}' is '{rc}'".format(
cmd=cmd, rc=rc))
return time.time() - t
def create_many(dirname, s, count):
"""Create many short files in the dirname directory
There will be count files in the directory, and each file will
contain the string s.
"""
dir_rp = rpath.RPath(Globals.local_connection, dirname)
if (not dir_rp.isdir()):
dir_rp.mkdir()
for i in range(count):
rp = dir_rp.append(b"file_%d" % i)
fp = rp.open("w")
fp.write(s)
fp.close()
def create_nested(dirname, s, depth, branch_factor):
"""Create many short files in branching directory"""
def write(rp):
fp = rp.open("w")
fp.write(s)
fp.close()
def helper(rp, depth):
if (not rp.isdir()):
rp.mkdir()
sub_rps = [rp.append("file_%d" % i) for i in range(branch_factor)]
if depth == 1:
list(map(write, sub_rps))
else:
list(map(lambda rp: helper(rp, depth - 1), sub_rps))
re_init_subdir(abs_test_dir, b'nested_out')
helper(rpath.RPath(Globals.local_connection, dirname), depth)
def benchmark(backup_cmd, restore_cmd, desc, update_func=None):
"""Print benchmark using backup_cmd and restore_cmd
If update_func is given, run it and then do backup a third time.
"""
times_list = []
times_list.append(run_cmd(backup_cmd))
print("Initially backing up %s: %ss" % (desc, times_list[-1]))
times_list.append(run_cmd(backup_cmd))
print("Updating %s, no change: %ss" % (desc, times_list[-1]))
if update_func:
update_func()
times_list.append(run_cmd(backup_cmd))
print("Updating %s, all changed: %ss" % (desc, times_list[-1]))
re_init_subdir(abs_test_dir, b'rest_out')
times_list.append(run_cmd(restore_cmd))
print("Restoring %s to empty dir: %ss" % (desc, times_list[-1]))
times_list.append(run_cmd(restore_cmd))
print("Restoring %s to unchanged dir: %ss" % (desc, times_list[-1]))
return times_list
def many(backup, restore, many_count=MANY_COUNT):
"""Time backup and restore of many_count files"""
manyout_dir = re_init_subdir(abs_test_dir, b'many_out')
backout_dir = re_init_subdir(abs_test_dir, b'back_out')
restout_dir = re_init_subdir(abs_test_dir, b'rest_out')
create_many(manyout_dir, "a", many_count)
backup_cmd = backup % (manyout_dir, backout_dir)
restore_cmd = restore % (backout_dir, restout_dir)
def update_func():
create_many(manyout_dir, "e", many_count)
return benchmark(backup_cmd, restore_cmd, "{count} 1-byte files".format(
count=many_count), update_func)
def nested(backup, restore, nested_depth=NESTED_DEPTH, nested_factor=NESTED_FACTOR):
"""Time backup and restore of factor**depth nested files"""
nestedout_dir = re_init_subdir(abs_test_dir, b'nested_out')
backout_dir = re_init_subdir(abs_test_dir, b'back_out')
restout_dir = re_init_subdir(abs_test_dir, b'rest_out')
create_nested(nestedout_dir, "a", nested_depth, nested_factor)
backup_cmd = backup % (nestedout_dir, backout_dir)
restore_cmd = restore % (backout_dir, restout_dir)
def update_func():
create_nested(nestedout_dir, "e", nested_depth, nested_factor)
nested_count = nested_factor**nested_depth
return benchmark(
backup_cmd, restore_cmd, "{count} 1-byte nested files".format(
count=nested_count), update_func)
def print_results(bench, results):
"""Print a table with the absolute and relative results"""
func_names = list(map(lambda x: x['name'], bench))
names_width = max(list(map(len, func_names)))
for ires in range(len(bench)):
sys.stdout.write("{name:{width}};".format(name=func_names[ires],
width=names_width))
all_results = results[ires][0:] # deep copy
for jres in range(len(results[0])):
all_results.append(results[ires][jres] / results[0][jres])
for value in all_results:
sys.stdout.write("{val:6.3f};".format(val=value))
print("")
# MAIN SECTION
benchmarks = {
'many': [
{
'name': 'many_rsync',
'func': many,
'backup': b"rsync -e ssh -aH --delete '%s' '%s'",
'restore': b"rsync -e ssh -aH --delete '%s' '%s'",
},
{
'name': 'many_normal',
'func': many,
'backup': b"rdiff-backup '%b' '%b'",
'restore': b"rdiff-backup --force -r now '%b' '%b'",
},
{
'name': 'many_no_fsync',
'func': many,
'backup': b"rdiff-backup --no-fsync '%b' '%b'",
'restore': b"rdiff-backup --no-fsync --force -r now '%b' '%b'",
},
],
'nested': [
{
'name': 'nested_rsync',
'func': nested,
'backup': b"rsync -e ssh -aH --delete '%s' '%s'",
'restore': b"rsync -e ssh -aH --delete '%s' '%s'",
},
{
'name': 'nested_normal',
'func': nested,
'backup': b"rdiff-backup '%b' '%b'",
'restore': b"rdiff-backup --force -r now '%b' '%b'",
},
{
'name': 'nested_no_fsync',
'func': nested,
'backup': b"rdiff-backup --no-fsync '%b' '%b'",
'restore': b"rdiff-backup --no-fsync --force -r now '%b' '%b'",
},
],
}
if len(sys.argv) != 2:
print("Syntax: benchmark.py many|nested")
sys.exit(1)
if 'BENCHMARKPYPATH' in os.environ:
new_pythonpath = os.fsencode(os.environ['BENCHMARKPYPATH'])
benchmark_name = sys.argv[1]
print("=== Running '{bench}' benchmark ===".format(bench=benchmark_name))
benchmark_results = []
for bench in benchmarks[benchmark_name]:
benchmark_results.append(bench['func'](bench['backup'], bench['restore']))
print("=== Results of '{bench}' benchmark (absolute and relative) ===".format(
bench=benchmark_name))
print_results(benchmarks[benchmark_name], benchmark_results)
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