test_copytree.py

#!python3

import datetime
import shutil
import os
import subprocess

# source and destiantion trees
src="/data/Backup/src/test-copy/src"
dst1="/data/Backup/src/test-copy/dst1"
dst2="/data/Backup/src/test-copy/dst2"
dst3="/data/Backup/src/test-copy/dst3"

# remove old dirs
print("Clean up");
for d in (dst1,dst2,dst3):
	if os.path.isdir(d): subprocess.run(["/bin/rm","-rf",d])

# make sure everything is cached
print("Cache run")
subprocess.run(["/bin/cp","-al", src, dst1])

# now let's compare copytree to gnu cp

print("Python copytree run")
start1 = datetime.datetime.now()
shutil.copytree(src, dst2, copy_function=os.link)
stop1 = datetime.datetime.now()

print("GNU cp run")
start2 = datetime.datetime.now()
subprocess.run(["/bin/cp","-al", src, dst3])
stop2 = datetime.datetime.now()

print("Result:")
print("Python: {:.3f}s".format((stop1-start1)/datetime.timedelta(seconds=1)))
print("GNU cp: {:.3f}s".format((stop2-start2)/datetime.timedelta(seconds=1)))
print("diff  : (:.3f}s".format((stop1-start1-stop2+start2)/datetime.timedelta(seconds=1)))